Metal

Bishop’s University Department of Economics The “Day-of-the-Week” Effect: Analysis of Trends in the Daily Returns of Copper and Aluminum Lucas Zawislak and Jennifer Lee Dr. M. Vigneault Applied Economic Analysis March 15th, 2013 Introduction According to the neoclassical school of economics, asset markets are assumed to be both efficient and random.

These two assumptions are the base from which two neoclassical theories are derived: 1) “The Efficient Market Theory” infers that the market is remarkably adept in its utilization of information; while 2) “The Random Walk Model” infers that accurate predictions of outcome cannot be made on the basis of historical data. In summation, it is assumed that the price behavior of assets is essentially random, and all relevant information is almost immediately incorporated into price. There are two key elements, in reference to market participants or decision makers, engrained in the neoclassical position.

First, it is presumed that the decision maker is rational and therefore makes decisions using the expected utility function. Second, this position reasons that each decision maker has access to, and uses, full information about the fundamental valuations of assets. Consequently, the market should be comprised of distinctly independent, fully informed and rational decision makers. Contrary to the neoclassical belief’s studies have uncovered irregularities, in asset returns, over specific ranges in time, specifically over the days of the week.

This observed anomaly is commonly referred to as “The-Day-of-the-Week-Effect” which challenges the notion of market efficiency and randomness. It proposes that the distribution of returns may vary according to the day of the week. The most distinct characteristic of this anomaly is a pattern of positive returns on Friday coupled with negative returns on Monday, also known as “the weekend effect”. Purpose and Motivation The objectives of this study are to determine if there is evidence of the day-of-the week-effect in the weekly price fluctuations of both Copper and Aluminum.

More specifically, we will determine if the assets returns are dependent on the day of the week in which they are generated. If this is proven true, it will have implications on the behavior of market participants in regards to the trading of these commodities. It would be difficult to directly and consistently exploit this effect each week, due to high transaction costs. The situation in which this could be best exploited would be when there are plans to add one of these commodities to a portfolio, due to some strategic objective.

In this case it would be advantageous to be aware of the effect and know exactly which day of the week the prices would be at their lowest. As I mentioned above, this anomaly will be tested against two base metals (commodities): copper and aluminum. Copper is the third most widely used metal in the world, and is highly versatile. It is a base metal used in building construction, power generation, transmission, electronic product manufacturing, and the production of industrial machinery and transportation vehicles. Aluminum is a substitute for copper and is used in many of the same applications.

Though the two metals are similar in application aluminum is a much cheaper alternative. When you familiarize yourself with the uses of both metals it becomes evident that they are essential to urban modernization. The demand for base metals is primarily fueled by economic growth, and though economic growth in the western hemisphere has slowed, countries such as China and India are experiencing a significant upward trend. Base metals are vital to this growth. On account of this demand, copper is in decreasing supply and due to uncertainty about future supply; this is likely to translate into price volatility.

When making a purchase decision this volatility can be offset by the knowledge of the price trends. Aluminum is still in good supply and due to its likeness to copper its demand is increasing. Method We have collected data on Copper and Aluminum prices, as reported on the London Metal Exchange, from January 2nd 2009 to February 15th 2013. The standard OLS method will be used to test the day-of-the-week effect in each of the commodities returns by regressing the data of the returns on the five daily dummy variables.

The regression model below will be the base from which all analysis will take place. Essentially the commodity prices will be the dependent variables in the regression, while time will be the independent variable. Regression Model I: Ri=the daily yied of the asset D1=1 if Monday;=0 otherwise D2=1 if Tuesday;=0 otherwise D3=1 if Wednesday;=0 otherwise D4=1 if Thursday;=0 otherwise D5=1 if Friday;=0 otherwise **Null Hypothesis of Interest: Daily Return Equation Rt=(PtPt-1-1)*100 Descriptive Statistics The descriptive statistics reflect the fore mentioned metal profiles. On verage copper returns are 43% higher than that of Aluminum. In terms of standard deviation the returns for both are quite similar. Both graphs indicate increasing volatility of returns, yet this is much more prominent for copper. This pattern supports my previous statement indicating decreasing supply and increasing demand as a source of volatility. The large range given by the minimum and maximum returns is another indication of the volatility of returns for both metals Works Cited Berument, M. , and Nukhet Dogan. “Stock Market Return And Volatility: Day-Of-The-Week Effect. Journal Of Economics & Finance 36. 2 (2012): 282-302. Business Source Complete. Web. 12 Mar. 2013. Boudreaux, Denis, Spuma Rao, and Phillip Fuller. “An Investigation Of The Weekend Effect During Different Market Orientations. ” Journal Of Economics & Finance 34. 3 (2010): 257-268. Business Source Complete. Web. 12 Mar. 2013. Derbali, Abdelkader, and Noureddine Khadraoui. “Day Of The Week Effect On Assets Return: Case Of The Stock Exchange Of Casablanca. ” Journal Of Business Studies Quarterly 3. 1 (2011): 274-283. Business Source Complete.

Web. 15 Mar. 2013. Hassan Chowdhury, Shah Saeed, and Rashida Sharmin. “Does Cross-Sectional Risk Explain Day-Of-The-Week Effects In Bangladesh Stock Market?. ” International Research Journal Of Finance & Economics 93 (2012): 84-94. Business Source Complete. Web. 15 Mar. 2013. Ulussever, Talat, Ibrahim Guran Yumusak, and Muhsin Kar. “The Day-Of-The-Week Effect In The Saudi Stock Exchange: A Non-Linear Garch Analysis. ” Journal Of Economic & Social Studies (JECOSS) 1. 1 (2011): 9-23. Business Source Complete. Web. 15 Mar. 2013.

Daniel Rutherford Jacobus Henricus Walther Hermann Nernst Reinhold Benesch & Ruth Erica Benesch Find How Oxygen is Transported in Human Body Frederick Soddy Artturi Ilmari Virtanen Louis Jacques Thenard discovers hydrogen peroxide Jbir ibn Hayyn Ya’qub Al-Kindi Paul Karrer Antoine-Laurent de Lavoisier Few things are as important as water, which we know is made of oxygen and hydrogen. Did you know that Antoine Lavoisier was the discoverer of both elements? Contributions to Science Antoine-Laurent de Lavoisier is one of the most important scientists in the history of chemistry.

He discovered elements, formulated a basic law of chemistry and helped create the metric system. During his time, people believed that when an object burns, a mysterious substance called ‘phlogiston’ was released. This was called the ‘phlogiston theory’. Lavoisier’s experiments demonstrated the contrary, i. e. when something burned, it actually absorbed something from the air, instead of releasing anything. He later named the ‘something’ from the air as oxygen, when he found that it combined with other chemicals to form acid. (In Greek, ‘oxy’ means sharp, referring to the sharp taste of acids. Henry Cavendish had earlier isolated hydrogen, but he called it inflammable air. Lavoisier showed that this inflammable air burned to form a colourless liquid, which turned out to be water. The Greek word for water is ‘hydro’, so the air that burned to form water was hydrogen! Lavoisier was known for his painstaking attention to detail. Whenever he made a chemical reaction, he weighed all the substances carefully before and after the reaction. He discovered that in a chemical reaction, though substances may change their chemical nature, their total mass remains the same.

This is called the law of conservation of mass. His love for accuracy led to the formulation of the metric system of weights and measures – which is still in use today. Lavoisier’s attention to detail and habit of recording everything is perhaps his most important contribution – for that is now the way science is done. Biography Lavoiser was born on 26 August 1743 in a wealthy Parisian family. He studied at the College Mazarin from 1754 to 1761. His interest in chemistry was developed as he read the works of Etienne Condillac.

In 1769, he set about making a geological map of France, which was important for that country’s industrial development. In 1769, he took a government position as a tax collector in the government of King Louis XVI. In 1771, he married Marie-Anne Pierette Paulze, who is considered as an eminent scientist in her own right. She translated the works of many scientists from English and German into French, and later on, with her husband, published the Traite elementaire de chimie, often considered the first comprehensive book on the subject.

In 1789, King Louis XVI was overthrown in the French Revolution. As Lavoisier had been a tax collector, he earned the wrath of the revolutionaries, who executed him on 8 May 1794. SOURCE: http://humantouchofchemistry. com/antoinelaurent-de-lavoisier. htm Elements and Atoms: Chapter 3 Lavoisier’s Elements of Chemistry Antoine-Laurent Lavoisier (1743-1794) has been called the founder of modern chemistry. (View a portrait of Mme. & M. Lavoisier by Jacque-Louis David at the Metropolitan Museum of Art, New York. Among his important contributions were the application of the balance and the principle of conservation of mass to chemistry, the explanation of combustion and respiration in terms of combination with oxygen rather than loss of phlogiston (See chapter 5. ), and a reform of chemical nomenclature. His Traite Elementaire de Chimie (1789), from which the present extract is taken in a contemporary translation, was a tremendously influential synthesis of his work. Lavoisier was a public servant as well as a scientist.

Under the French monarchy, he was a member of the tax-collecting agency, the Ferme Generale. His work for the government included advocating rational agricultural methods and improving the manufacture of gunpowder. His service to France continued during the Revolution. He was an alternate deputy of the reconvened Estates-General in 1789, and from 1790 served on a commission charged with making weights and measures uniform across France. A Parisian by birth, Lavoisier also died in Paris, guillotined with other former members of the Ferme Generale during the Reign of Terror in May 1794.

The preface to his Traite Elementaire de Chimie is a fitting selection to follow Boyle’s The Sceptical Chymist because it includes the definition of element that was to dominate chemistry throughout the next century, and which is still familiar in our own day. In addition, Lavoisier’s musings on the connection between science and the language which conveys its ideas remain thought-provoking, particularly in light of the writings of Bertrand Russell, Ludwig Wittgenstein, and Alfred Ayer in the first half of the 20th century.

Even his comments about the pedagogy of introductory chemistry take sides in a debate that remains current. Antoine Lavoisier, Preface to Elements of Chemistry translation by Robert Kerr (Edinburgh, 1790), pp. xiii-xxxvii When I began the following Work, my only object was to extend and explain more fully the Memoir which I read at the public meeting of the Academy of Science in the month of April 1787, on the necessity of reforming and completing the Nomenclature of Chemistry[1].

While engaged in this employment, I perceived, better than I had ever done before, the justice of the following maxims of the Abbe de Condillac[2], in his System of Logic, and some other of his works. “We think only through the medium of words. –Languages are true analytical methods. –Algebra, which is adapted to its purpose in every species of expression, in the most simple, most exact, and best manner possible, is at the same time a language and an analytical method. –The art of reasoning is nothing more than a language well arranged. ” Thus, while I thought myself employed only in forming a Nomenclature, and while I roposed to myself nothing more than to improve the chemical language, my work transformed itself by degrees, without my being able to prevent it, into a treatise upon the Elements of Chemistry. The impossibility of separating the nomenclature of a science from the science itself, is owing to this, that every branch of physical science must consist of three things; the series of facts which are the objects of the science, the ideas which represent these facts, and the words by which these ideas are expressed. Like three impressions of the same seal, the word ought to produce the idea, and the idea to be a picture of the fact.

And, as ideas are preserved and communicated by means of words, it necessarily follows that we cannot improve the language of any science without at the same time improving the science itself; neither can we, on the other hand, improve a science, without improving the language or nomenclature which belongs to it. However certain the facts of any science may be, and, however just the ideas we may have formed of these facts, we can only communicate false impressions to others, while we want words by which these may be properly expressed. 3] To those who will consider it with attention, the first part of this treatise will afford frequent proofs of the truth of the above observations. But as, in the conduct of my work, I have been obliged to observe an order of arrangement essentially differing from what has been adopted in any other chemical work yet published, it is proper that I should explain the motives which have led me to do so. It is a maxim universally admitted in geometry, and indeed in every branch of knowledge, that, in the progress of investigation, we should proceed from known facts to what is unknown.

In early infancy, our ideas spring from our wants; the sensation of want excites the idea of the object by which it is to be gratified. In this manner, from a series of sensations, observations, and analyses, a successive train of ideas arises, so linked together, that an attentive observer may trace back to a certain point the order and connection of the whole sum of human knowledge. When we begin the study of any science, we are in a situation, respecting that science, similar to that of children; and the course by which we have to advance is precisely the same which Nature follows in the formation of their ideas.

In a child, the idea is merely an effect produced by a sensation; and, in the same manner, in commencing the study of a physical science, we ought to form no idea but what is a necessary consequence, and immediate effect, of an experiment or observation. [4] Besides, he that enters upon the career of science, is in a less advantageous situation than a child who is acquiring his first ideas. To the child, Nature gives various means of rectifying any mistakes he may commit respecting the salutary or hurtful qualities of the objects which surround him.

On every occasion his judgments are corrected by experience; want and pain are the necessary consequences arising from false judgment; gratification and pleasure are produced by judging aright. Under such masters, we cannot fail to become well informed; and we soon learn to reason justly, when want and pain are the necessary consequences of a contrary conduct. [5] In the study and practice of the sciences it is quite different; the false judgments we form neither affect our existence nor our welfare; and we are not forced by any physical necessity to correct them.

Imagination, on the contrary, which is ever wandering beyond the bounds of truth, joined to self-love and that self-confidence we are so apt to indulge, prompt us to draw conclusions which are not immediately derived from facts; so that we become in some measure interested in deceiving ourselves. Hence it is by no means to be wondered, that, in the science of physics in general, men have often made suppositions, instead of forming conclusions.

These suppositions, handed down from one age to another, acquire additional weight from the authorities by which they are supported, till at last they are received, even by men of genius, as fundamental truths. The only method of preventing such errors from taking place, and of correcting them when formed, is to restrain and simplify our reasoning as much as possible. This depends entirely upon ourselves, and the neglect of it is the only source of our mistakes. We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive.

We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation. Thus mathematicians obtain the solution of a problem by the mere arrangement of data, and by reducing their reasoning to such simple steps, to conclusions so very obvious, as never to lose sight of the evidence which guides them. [6] Thoroughly convinced of these truths, I have imposed upon myself, as a law, never to advance but from what is known to what is unknown; never to form any conclusion which is not an immediate consequence necessarily lowing from observation and experiment; and always to arrange the fact, and the conclusions which are drawn from them, in such an order as shall render it most easy for beginners in the study of chemistry thoroughly to understand them. Hence I have been obliged to depart from the usual order of courses of lectures and of treatises upon chemistry, which always assume the first principles of the science, as known, when the pupil or the reader should never be supposed to know them till they have been explained in subsequent lessons.

In almost every instance, these begin by treating of the elements of matter, and by explaining the table of affinities[7], without considering, that, in so doing, they must bring the principal phenomena of chemistry into view at the very outset: They make use of terms which have not been defined, and suppose the science to be understood by the very persons they are only beginning to teach. 8] It ought likewise to be considered, that very little of chemistry can be learned in a first course, which is hardly sufficient to make the language of the science familiar to the ears, or the apparatus familiar to the eyes. It is almost impossible to become a chemist in less than three or four years of constant application. These inconveniencies are occasioned not so much by the nature of the subject, as by the method of teaching it; and, to avoid them, I was chiefly induced to adopt a new arrangement of chemistry, which appeared to me more consonant to the order of Nature.

I acknowledge, however, that in thus endeavouring to avoid difficulties of one kind, I have found myself involved in others of a different species, some of which I have not been able to remove; but I am persuaded, that such as remain do not arise from the nature of the order I have adopted, but are rather consequences of the imperfection under which chemistry still labours.

This science still has many chasms, which interrupt the series of facts, and often render it extremely difficult to reconcile them with each other: It has not, like the elements of geometry, the advantage of being a complete science, the parts of which are all closely connected together: Its actual progress, however, is so rapid, and the facts, under the modern doctrine, have assumed so happy an arrangement, that we have ground to hope, even in our own times, to see it approach near to the highest state of perfection of which it is susceptible. 9] The rigorous law from which I have never deviated, of forming no conclusions which are not fully warranted by experiment, and of never supplying the absence of facts, has prevented me from comprehending in this work the branch of chemistry which treats of affinities, although it is perhaps the best calculated of any part of chemistry for being reduced into a completely systematic body.

Messrs Geoffroy, Gellert, Bergman, Scheele, De Morveau, Kirwan,[10] and many others, have collected a number of particular facts upon this subject, which only wait for a proper arrangement; but the principal data are still wanting, or, at least, those we have are either not sufficiently defined, or not sufficiently proved, to become the foundation upon which to build so very important a branch of chemistry.

This science of affinities, or elective attractions, holds the same place with regard to the other branches of chemistry, as the higher or transcendental geometry does with respect to the simpler and elementary part; and I thought it improper to involve those simple and plain elements, which I flatter myself the greatest part of my readers will easily understand, in the obscurities and difficulties which still attend that other very useful and necessary branch of chemical science. Perhaps a sentiment of self-love may, without my perceiving it, have given additional force to these reflections.

Mr de Morveau is at present engaged in publishing the article Affinity in the Methodical Encyclopedia; and I had more reasons than one to decline entering upon a work in which he is employed. It will, no doubt, be a matter of surprise, that in a treatise upon the elements of chemistry, there should be no chapter on the constituent and elementary parts of matter; but I shall take occasion, in this place, to remark, that the fondness for reducing all the bodies in nature to three or four elements, proceeds from a prejudice which has descended to us from the Greek Philosophers.

The notion of four elements, which, by the variety of their proportions, compose all the known substances in nature, is a mere hypothesis, assumed long before the first principles of experimental philosophy or of chemistry had any existence. In those days, without possessing facts, they framed systems; while we, who have collected facts, seem determined to reject them, when they do not agree with our prejudices.

The authority of these fathers of human philosophy still carry great weight, and there is reason to fear that it will even bear hard upon generations yet to come. [11] It is very remarkable, that, notwithstanding of the number of philosophical chemists who have supported the doctrine of the four elements, there is not one who has not been led by the evidence of facts to admit a greater number of elements into their theory.

The first chemists that wrote after the revival of letters, considered sulphur and salt as elementary substances entering into the composition of a great number of substances; hence, instead of four, they admitted the existence of six elements. Beccher assumes the existence of three kinds of earth, from the combination of which, in different proportions, he supposed all the varieties of metallic substances to be produced. Stahl gave a new modification to this system; and succeeding chemists have taken the liberty to make or to imagine changes and additions of a similar nature.

All these chemists were carried along by the influence of the genius of the age in which they lived, which contented itself with assertions without proofs; or, at least, often admitted as proofs the slightest degrees of probability, unsupported by that strictly rigorous analysis required by modern philosophy. [12] All that can be said upon the number and nature of elements is, in my opinion, confined to discussions entirely of a metaphysical nature. The subject only furnishes us with indefinite problems, which may be solved in a thousand different ways, not one of which, in all probability, is consistent with nature.

I shall therefore only add upon this subject, that if, by the term elements, we mean to express those simple and indivisible atoms of which matter is composed, it is extremely probable we know nothing at all about them; but, if we apply the term elements, or principles of bodies, to express our idea of the last point which analysis is capable of reaching, we must admit, as elements, all the substances into which we are capable, by any means, to reduce bodies by decomposition. 13] Not that we are entitled to affirm, that these substances we consider as simple may not be compounded of two, or even of a greater number of principles; but, since these principles cannot be separated, or rather since we have not hitherto discovered the means of separating them, they act with regard to us as simple substances, and we ought never to suppose them compounded until experiment and observation has proved them to be so. 14] The foregoing reflections upon the progress of chemical ideas naturally apply to the words by which these ideas are to be expressed. Guided by the work which, in the year 1787, Messrs de Morveau, Berthollet, de Fourcroy, and I composed upon the Nomenclature of Chemistry, I have endeavoured, as much as possible, to denominate simple bodies by simple terms, and I was naturally led to name these first. 15] It will be recollected, that we were obliged to retain that name of any substance by which it had been long known in the world, and that in two cases only we took the liberty of making alterations; first, in the case of those which were but newly discovered, and had not yet obtained names, or at least which had been known but for a short time, and the names of which had not yet received the sanction of the public; and, secondly, when the names which had been adopted, whether by the ancients or the moderns, appeared to us to express evidently false ideas, when they confounded the substances, to which they were applied, with others possessed of different, or perhaps opposite qualities. We made no scruple, in this case, of substituting other names in their room, and the greatest number of these were borrowed from the Greek language. We endeavoured to frame them in such a manner as to express the most general and the most characteristic quality of the substances; and this was attended with the additional advantage both of assisting the memory of beginners, who find it difficult to remember a new word which has no meaning, and of accustoming them early to admit no word without connecting with it some determinate idea. 16] To those bodies which are formed by the union of several simple substances we gave new names, compounded in such a manner as the nature of the substances directed; but, as the number of double combinations is already very considerable, the only method by which we could avoid confusion, was to divide them into classes. In the natural order of ideas, the name of the class or genus is that which expresses a quality common to a great number of individuals: The name of the species, on the contrary, expresses a quality peculiar to certain individuals only. [17] These distinctions are not, as some may imagine, merely metaphysical, but are established by Nature. A child,” says the Abbe de Condillac, “is taught to give the name tree to the first one which is pointed out to him. The next one he sees presents the same idea, and he gives it the same name. This he does likewise to a third and a fourth, till at last the word tree, which he first applied to an individual, comes to be employed by him as the name of a class or a genus, an abstract idea, which comprehends all trees in general. But, when he learns that all trees serve not the same purpose, that they do not all produce the same kind of fruit, he will soon learn to distinguish them by specific and particular names. ” This is the logic of all the sciences, and is naturally applied of chemistry.

The acids, for example, are compounded of two substances, of the order of those which we consider as simple; the one constitutes acidity, and is common to all acids, and, from this substance, the name of the class or the genus ought to be taken; the other is peculiar to each acid, and distinguishes it from the rest, and from this substance is to be taken the name of the species. But, in the greatest number of acids, the two constituent elements, the acidifying principle, and that which it acidifies, may exist in different proportions, constituting all the possible points of equilibrium or of saturation. This is the case in the sulphuric and the sulphurous acids; and these two states of the same acid we have marked by varying the termination of the specific name. Metallic substances which have been exposed to the joint action of the air and of fire, lose their metallic lustre, increase in weight, and assume an earthy appearance.

In this state, like the acids, they are compounded of a principle which is common to all, and one which is peculiar to each. In the same way, therefore, we have thought proper to class them under a generic name, derived from the common principle; for which purpose, we adopted the term oxyd; and we distinguish them from each other by the particular name of the metal to which each belongs. [18] Combustible substances, which in acids and metallic oxyds are a specific and particular principle, are capable of becoming, in their turn, common principles of a great number of substances. The sulphurous combinations have been long the only known ones in this kind.

Now, however, we know, from the experiments of Messrs Vandermonde, Monge, and Berthollet, that charcoal may be combined with iron, and perhaps with several other metals; and that, from this combination, according to the proportions, may be produced steel, plumbago, &c. [19] We know likewise, from the experiments of M. Pelletier, that phosphorus may be combined with a great number of metallic substances. These different combinations we have classed under generic names taken from the common substance, with a termination which marks this analogy, specifying them by another name taken from that substance which is proper to each. The nomenclature of bodies compounded of three simple substances was attended with still greater difficulty, not only on account of their number, but, particularly, because we cannot express the nature of their constituent principles without employing more compound names.

In the bodies which form this class, such as the neutral salts, for instance, we had to consider, 1st, The acidifying principle, which is common to them all; 2d, The acidifiable principle which constitutes their peculiar acid; 3d, The saline, earthy, or metallic basis, which determines the particular species of salt. Here we derived the name of each class of salts from the name of the acidifiable principle common to all the individuals of that class; and distinguished each species by the name of the saline, earthy, or metallic basis, which is peculiar to it. [20] A salt, though compounded of the same three principles, may, nevertheless, by the mere difference of their proportion, be in three different states.

The nomenclature we have adopted would have been defective, had it not expressed these different states; and this we attained chiefly by changes of termination uniformly applied to the same state of the different salts. In short, we have advanced so far, that from the name alone may be instantly found what the combustible substance is which enters into any combination; whether that combustible substance be combined with the acidifying principle, and in what proportion; what is the state of the acid; with what basis it is united; whether the saturation be exact, or whether the acid or the basis be in excess. It may be easily supposed that it was not possible to attain all these different objects without departing, in some instances, from established custom, and adopting terms which at first sight will appear uncouth and barbarous.

But we considered that the ear is soon habituated to new words, especially when they are connected with a general and rational system. The names, besides, which were formerly employed, such as powder of algaroth, salt of alembroth, pompholix, phagadenic water, turbith mineral, colcothar, and many others, were neither less barbarous nor less uncommon. [21] It required a great deal of practice, and no small degree of memory, to recollect the substances to which they were applied, much more to recollect the genus of combination to which they belonged. The names of oil of tartar per deliquium, oil of vitriol, butter of arsenic and of antimony, flowers of zinc, &c. ere still more improper, because they suggested false ideas: For, in the whole mineral kingdom, and particularly in the metallic class, there exists no such thing as butters, oils, or flowers; and, in short, the substances to which they give these fallacious names, are nothing less than rank poisons. [22] When we published our essay on the nomenclature of chemistry, we were reproached for having changed the language which was spoken by our masters, which they distinguished by their authority, and handed down to us. But those who reproach us on this account, have forgotten that it was Bergman and Macquer themselves who urged us to make this reformation. In a letter which the learned Professor of Upsal, M. Bergman, wrote, a short time before he died, to M. de Morveau, he bids him spare no improper names; those who are learned, will always be learned, and those who are ignorant will thus learn sooner. 23] There is an objection to the work which I am going to present to the public, which is perhaps better founded, that I have given no account of the opinion of those who have gone before me; that I have stated only my own opinion, without examining that of others. By this I have been prevented from doing that justice to my associates, and more especially to foreign chemists, which I wished to render them. But I beseech the reader to consider, that, if I had filled an elementary work with a multitude of quotations; if I had allowed myself to enter into long dissertations on the history of the science, and the works of those who have studied it, I must have lost sight of the true object I had in view, and produced a work, the reading of which must have been extremely tiresome to beginners.

It is not to the history of the science, or of the human mind, that we are to attend in an elementary treatise:[24] Our only aim ought to be ease and perspicuity, and with the utmost care to keep every thing out of view which might draw aside the attention of the student; it is a road which we should be continually rendering more smooth, and from which we should endeavour to remove every obstacle which can occasion delay. The sciences, from their own nature, present a sufficient number of difficulties, though we add not those which are foreign to them. But, besides this, chemists will easily perceive, that, in the fist part of my work, I make very little use of any experiments but those which were made by myself: If at any time I have adopted, without acknowledgment, the experiments or the opinions of M. Berthollet, M. Fourcroy, M. de la Place, M.

Monge, or, in general, of any of those whose principles are the same with my own, it is owing to the circumstance, that frequent intercourse, and the habit of communicating our ideas, our observations, and our way of thinking to each other, has established between us a sort of community of opinions, in which it is often difficult for every one to know his own. [25] The remarks I have made on the order which I thought myself obliged to follow in the arrangement of proofs and ideas, are to be applied only to the first part of this work. It is the only one which contains the general sum of the doctrine I have adopted, and to which I wished to give a form completely elementary. 26] The second part is composed chiefly of tables of the nomenclature of the neutral salts. To these I have only added general explanations, the object of which was to point out the most simple processes for obtaining the different kinds of known acids. This part contains nothing which I can call my own, and presents only a very short abridgment of the results of these processes, extracted from the works of different authors. In the third part, I have given a description, in detail, of all the operations connected with modern chemistry. I have long thought that a work of this kind was much wanted, and I am convinced it will not be without use.

The method of performing experiments, and particularly those of modern chemistry, is not so generally known as it ought to be; and had I, in the different memoirs which I have presented to the Academy, been more particular in the detail of the manipulations of my experiments, it is probable I should have made myself better understood, and the science might have made a more rapid progress. The order of the different matters contained in this third part appeared to me to be almost arbitrary; and the only one I have observed was to class together, in each of the chapters of which it is composed, those operations which are most connected with one another. I need hardly mention that this part could not be borrowed from any other work, and that, in the principal articles it contains, I could not derive assistance from any thing but the experiments which I have made myself.

I shall conclude this preface by transcribing, literally, some observations of the Abbe de Condillac, which I think describe, with a good deal of truth, the state of chemistry at a period not far distant from our own. These observations were made on a different subject; but they will not, on this account, have less force, if the application of them be thought just. [27] “Instead of applying observation to the things we wished to know, we have chosen rather to imagine them. Advancing from one ill founded supposition to another, we have at last bewildered ourselves amidst a multitude of errors. These errors becoming prejudices, are, of course, adopted as principles, and we thus bewilder ourselves more and more. The method, too, by which we conduct our reasonings is as absurd; we abuse words which we do not understand, and call this the art of reasoning.

When matters have been brought this length, when errors have been thus accumulated, there is but one remedy by which order can be restored to the faculty of thinking; this is, to forget all that we have learned, to trace back our ideas to their source, to follow the train in which they rise, and, as my Lord Bacon says, to frame the human understanding anew. “This remedy becomes the more difficult in proportion as we think ourselves more learned. Might it not be thought that works which treated of the sciences with the utmost perspicuity, with great precision and order, must be understood by every body? The fact is, those who have never studied any thing will understand them better than those who have studied a great deal, and especially those who have written a great deal. At the end of the fifth chapter, the Abbe de Condillac adds: “But, after all, the sciences have made progress, because philosophers have applied themselves with more attention to observe, and have communicated to their language that precision and accuracy which they have employed in their observations: In correcting their language they reason better. ” Antoine Lavoisier, Table of Simple Substances in Elements of Chemistry translation by Robert Kerr (Edinburgh, 1790), pp. 175-6 Simple substances belonging to all the kingdoms of nature, which may be considered as the elements of bodies. New Names. | Correspondent old Names. | Light[28]| Light. | Caloric| Heat. | | Principle or element of heat. | | Fire. Igneous fluid. | Matter of fire and of heat. | Oxygen[29]| Depholgisticated air. | | Empyreal air. | | Vital air, or | | Base of vital air. | Azote[30]| Phlogisticated air or gas. | | Mephitis, or its base. | Hydrogen[31]| Inflammable air or gas, | | or the base of inflammable air. | Oxydable[32] and Acidifiable simple Substances not Metallic. New Names. | Correspondent old names. | Sulphur| The same names. | Phosphorus | | Charcoal | | Muriatic radical[33]| Still unknown. | Fluoric radical | | Boracic radical| | Oxydable and Acidifiable simple Metallic Bodies. New Names. | Correspondent Old Names. | Antimony| Regulus[34] of| Antimony. | Arsenic| ” “| Arsenic |

Bismuth| ” “| Bismuth | Cobalt| ” “| Cobalt | Copper| ” “| Copper | Gold| ” “| Gold | Iron| ” “| Iron | Lead| ” “| Lead | Manganese| ” “| Manganese | Mercury| ” “| Mercury | Molybdena[35]| ” “| Molybdena | Nickel| ” “| Nickel | Platina| ” “| Platina | Silver| ” “| Silver | Tin| ” “| Tin | Tungstein[36]| ” “| Tungstein | Zinc| ” “| Zinc| Salifiable simple Earthy Substances[37] New Names. | Correspondent Old Names. | Lime| Chalk, calcareous earth. | | Quicklime. | Magnesia| Magnesia, base of Epsom salt. | | Calcined or caustic magnesia. | Barytes| Barytes, or heavy earth. | Argill| Clay, earth of alum. | Silex| Siliceous or vitrifiable earth. |

Notes [1]Lavoisier read “Methode de Nomenclature Chimique” before the French Academy on 18 April 1787. This outline for a reformulation of chemical nomenclature was prepared by Lavoisier and three of his early converts to the oxygen theory of combustion, Louis Bernard Guyton de Morveau, Claude Louis Berthollet, and Antoine Francois de Fourcroy. De Morveau had already argued for a reformed nomenclature, and he developed the April 1787 outline in a memoir read to the Academy on 2 May 1787. [Leicester & Klickstein 1952] [2]Etienne Bonnot de Condillac (1715-1780) was a French philosopher and associate of Rousseau, Diderot, and the Encyclopedists.

His La Logique (1780) stressed the importance of language as a tool in scientific and logical reasoning. [3]Lavoisier makes an excellent point, but he overstates it. Clearly ones ideas are not strictly limited or determined by one’s language. New ideas must exist before new terms can be coined to express those ideas; thus new ideas can be formed and even to some extent described under the sway of older language. Also, new terms can only be defined by reference to pre-existing terms. Sometimes new terms are not necessary, as old terms absorb new meanings. For example, I hope that the selections in this book show to some extent how the terms “atom” and “element” have changed in meaning over time.

Having made these points, I do not wish to minimize the ability of new terminology to help the mind to run along the path of new insights, or to prevent it from falling into old misconceptions. [4]Note that Lavoisier does not say merely that we ought not believe any idea but what follows immediately and necessarily from experiment, we ought not even form the idea. This statement shows a wariness of hypotheses common to many early scientists and natural philosophers. Compare Newton’s, “I frame no hypotheses; for … hypotheses … have no place in experimental philosophy. ” [in Bartlett 1980] Hypotheses had no part in the empirical methodology of Francis Bacon (1561-1626; see portrait at National Portrait Gallery, London), which emphasized collection and classification of facts. This aversion to hypotheses is too not urprising if one considers that empiricists were attempting to distance themselves from rationalism. Later formulations of the scientific method, however, acknowledge the utility of hypotheses, always treated as provisional, in both suggesting experiments and interpreting them. [5]Lavoisier was not the last to observe that children are born scientists who learn by experience. [6]Lavoisier’s choice of mathematics as an example may strike a modern reader as odd. While mathematics has long served as an example of the kind of certainty to which scientists aspire (“mathematical certainty”), it is now seen as based on axioms, not empirically based.

Such mathematical systems as non-Euclidean geometry, which seemed to disagree with observed reality, had not yet been constructed at the time of Lavoisier’s writing, though. [7]A table of affinities was a summary of a great deal of information on chemical reactions. It lists what substances react chemically with a given substance, often in order of the vigor or extent of the reaction. (If substance A reacted more strongly than substance B with a given material, then substance A was said to have a greater affinity than B for that material. ) View a table of affinities by Etienne-Francois Geoffroy (1672-1731). [8]In Lavoisier’s mind, it makes no sense to jump to this summary table without first describing the various substances and their characteristic reactions.

The proper role of descriptive chemistry in the chemical curriculum continues to be a topic of debate in chemical education. Apparently Lavoisier would be quite sympathetic to the charge that introductory courses emphasize unifying principles at the expense of descriptive chemistry. [9]This is certainly an optimistic statement! Two hundred years later chemistry has developed to an extent Lavoisier could not have imagined, yet it is a rare and foolish chemist who expects the science to exhaust its possibilities for discovery within a lifetime. [10]Bergman, Scheele, De Morveau, and Kirwan were all contemporaries of Lavoisier. The Swedish chemist Carl Wilhelm Scheele had a hand in the discovery of oxygen, chlorine, and manganese.

The Swedish chemist and mineralogist Torbern Bergman made contributions to analytical chemistry and the classification of minerals. Richard Kirwan was an Irish chemist and a defender of the phlogiston theory. [11]The influence of the ancients was on the decline when Lavoisier wrote these words, but he does not exaggerate the importance of their thought. Remember that he is still concerned about their influence more than a century after The Sceptical Chymist and more than two millennia after the . (See chapters 1 and 2. ) The simplicity of ancient ideas of matter would continue to have an influence on chemists well after Lavoisier’s time, particularly as the number of chemical elements grew. (See chapter 10. [12]Johann Joachim Becher (1635-1682) and Georg Ernst Stahl (1660-1734) were the two men most closely associated with the phlogiston theory. Lavoisier was largely responsible for dislodging and discrediting the notion that combustion and respiration involved a loss of a subtle material called phlogiston. (See chapter 5. ) Lavoisier makes light of their ideas here, but the theory, though incorrect, was not as nonsensical as it may now appear. [13]Notice the pragmatism of Lavoisier’s approach: he suggests, in essence, forgetting about the ultimate building blocks of matter. This was a prudent recommendation, for he had no way of addressing that subject empirically (which is why he dismisses it as metaphysical).

He continues by suggesting that chemists turn their attention to what they can observe empirically, the ultimate products of chemical analysis. The definition of an element as a body which cannot be broken down further by chemical analysis is an operational one: as the techniques of chemical analysis improved, then substances scientists had any right to regard as elements could change. At first, this definition of element appears to be similar to that of Boyle. (See chapter 2, note 9. ) However, Boyle seemed not to consider elementary substances which were not components of all compound matter. [14]Lavoisier’s table of simple bodies, reproduced below the preface, follows this prescription approximately, but not exactly. See note 33 below. ) [15]See note 34 below on names of metals. [16]Thus, where possible the name of a chemical substance should not simply be an arbitrary word, but should give some information about the substance. This principle is particularly evident in the modern systematic nomenclature of organic compounds: the name enables one who knows the rules of nomenclature and some organic chemistry to draw the structural formula of a compound from its name. (See IUPAC 1979, 1993. ) The principle is also evident in the nomenclature of inorganic compounds [IUPAC 1971], the class of compounds Lavoisier’s nomenclature primarily addresses. It is least vident in modern names of the elements, many of which are named after important scientists (e. g. curium, mendelevium, rutherfordium) or places important to the discoverers (e. g. polonium). (See Ringnes 1989 for etymology of elements’ names. ) Ironically, Lavoisier coined the name for an element central to his contributions to chemistry, a name of Greek origin chosen to convey information about the element which turned out to be incorrect. The name “oxygen” means “acid former,” for Lavoisier believed that oxygen was a component of all acids. [17]Already we see the close connection Lavoisier envisioned between the language of chemistry and the content of the science.

The system of naming compounds depends on classifying those compounds. Compounds belonging to the same class would have similar names. The name would also reflect the chemical composition of the substance. [18]So the classes of compounds included acids, oxides, sulfides, and the like. To specify which acid, a particular name was added, e. g. nitrous acid. Different suffixes distinguished between similar particular names (such as sulfuric and sulfurous–the -ic suffix applying to the more highly oxidized form). [19]What Lavoisier has in mind is a class of materials now called carbides, inorganic compounds of a metal and carbon (“charcoal”). But the examples he gives are not carbides.

Steel is an alloy (a mixture or solution of metals, and therefore not a chemical compound of definite proportions); in particular, steel is principally iron with some carbon and sometimes other metals (such as chromium or manganese). Although plumbago has been used to refer to a variety of lead-containing substances (as might be guessed from the root plumb-), it also (as here) refers to the substance now called graphite, the form of carbon commonly used for pencil “leads. ” [20]Again in the case of salts we see the nomenclature embodying the principles of the chemical theory of the day. A salt was seen as a compound of an acid and a base, and an acid itself a compound of an acidifiable part and an acidifying part.

The acidifying part, whatever its nature, was believed to be common to all acids; since it would not distinguish one salt from another, it does not appear in the name of the salt. The salts, then, carry the name of the acidifiable piece and the base with which it combines. [21]Pompholix was a crude (i. e. , not very pure) zinc oxide (ZnO), sometimes known by the more pleasant but hardly more informative name flowers of zinc. Phagadenic water was a corrosive liquid used to cleanse ulcers; phagadenic refers to a spreading or “eating” ulcer. Colcothar is a brownish-red mixture containing primarily ferric oxide (Fe2O3) with some calcium sulfate (CaSO4). [Oxford 1971] [22]Oil of vitriol is sulfuric acid, a viscous liquid.

Butter of arsenic (arsenic trichloride) is an oily liquid; and butter of antimony (antimony trichloride) is a colorless deliquescent solid. In one sense, these names are informative, for they suggest the physical appearance of the substances they name; they are, however, also misleading in the sense Lavoisier points out. [23]Lavoisier recognizes that even the most rationally designed nomenclature would be useless if chemists chose not to use it. A language is one of the most visible signs of a people and culture; naturally, efforts to tamper with it can meet with disapproval. Thus Lavoisier pays at least nominal attention to aesthetic and cultural considerations, noting just above that the new terms sound no more “barbarous” than some technical terms then in existence.

In a similar vein, he makes a concession to linguistic conservatism still further above, where he indicates that he does not propose to displace familiar names, at least for elements. And here he concedes that one ought not lightly to tamper with language, but that in doing so he is responding to a need and a demand. [24]Chemistry curricula in general devote little time to the history of the science, and that little usually consists of anecdotes scattered among other material. Discoverers of laws and elements may be mentioned; the pathways of discovery, however, let alone false steps on those pathways, almost never are. (See, however, Giunta 2001. In my opinion, the teaching of scientific process (as opposed to content) suffers as a result. The emphasis on current content to the exclusion of historical material, however, itself has a long history and such distinguished advocates as Lavoisier. [25]The standards for crediting others for their ideas, particularly when they are similar to one’s own, were not as stringent in Lavoisier’s time as in our own. And yet Lavoisier was criticized even by contemporaries for failing to give what they believed to be sufficient credit. For instance, Joseph Priestley did not believe Lavoisier gave him sufficient credit for the discovery of “dephlogisticated air” (oxygen) when he described his own similar experiments [Conant 1957].

And Lavoisier’s failure to credit James Watt and Henry Cavendish for their insights into the compound nature of water were a part of the sometimes rancorous “water controversy” [Ihde 1964]. See chapters 4 and 6 for articles on these subjects. [26]The first part of the treatise deals with gases, caloric, and the combustion of elements, so it truly contains the work most closely associated with Lavoisier. [27]Indeed, these words, which advocate empirical observation over rationalism as the source of reliable knowledge, apply to any science. [28]Light and caloric are not found on modern tables of elements because they are even matter, let alone elements of material bodies.

Although a wave theory of light had been proposed by this time (by Christiaan Huygens), Newton’s corpuscular (particle) theory was widely accepted until the 19th century. Similarly, until the 19th century, heat was widely believed to be a material, a fluid which flowed out of hot bodies and into cold ones (even though mechanical theories of heat with a Newtonian pedigree also existed at this time). See chapter 5, note 17 for a description of Lavoisier’s thinking about heat and fire. ) [29]As mentioned above, the name oxygen means “acid former,” for Lavoisier believed (incorrectly) that oxygen was a component of all acids. Oxygen was a relatively recently discovered substance, and it did not have a standard name.

The various names used for it are descriptive, but clumsy. “Dephlogisticated air” is particularly objectionable, for it described oxygen in terms of the phlogistion theory, which Lavoisier was in the process discrediting. [30]The name azote and the current name nitrogen were both used in English from the time of Lavoisier into the 19th century. Azote means “lifeless,” for breathing nitrogen does not sustain life. [31]Hydrogen means “water former,” for water results from the burning of hydrogen. (See chapter 6. ) Hydrogen was one of several gases discovered in the 18th century. The names then in use for it were informative, denoting its flammability. [32]I. e. substances which can be oxidized (combined with oxygen). [33]These three radicals or “roots” had not yet been isolated or properly characterized. The fluoric radical, now called fluorine, is the root of fluorspar and other fluorine-containing minerals. Fluorine is very difficult to separate from its compounds, and is a very reactive and dangerous gas in its elemental form. This gas was not isolated until 1886. The boracic radical, now called boron, is the root of the mineral borax (Na2B4O7); boron was not isolated until 1808. [Weeks & Leicester, 1968] Muriatic acid was the name then in use for what we call hydrochloric acid or hydrogen chloride, HCl.

Chlorine, the element which distinguishes this acid from others, was discovered by Carl Wilhelm Scheele; however, he named it oxymuriatic acid, believing it to be a compound containing oxygen. Muriatic radical, then, was the name for the hypothetical element believed to be combined with oxygen in oxymuriatic acid. Muriatic, by the way, means “pertaining to … brine or salt” [Oxford 1971]; the salt of muriatic acid is common table salt, sodium chloride (NaCl). Lavoisier had good reason to expect that these radicals would be isolated, for their compounds had been known for a long time; however, the fluoric and boracic radicals were, strictly speaking, hypothetical substances at this time, and the basis of muriatic acid had already been isolated but he did not recognize it as elementary.

Had he kept strictly to the principle of considering a substance an element if it could not be further decomposed, then Lavoisier should also have included “oxymuriatic acid” (undoubtedly by a different name) among the elements; as it was, chlorine was named and recognized to be elementary only in 1810 [Davy 1810, 1811]. Although we can see, with hindsight, that Lavoisier was incorrect, it was by no means obvious at the time. Chlorine had been prepared from reactions with substances that do contain oxygen, for example from pyrolusite (MnO2) in Scheele’s original isolation and from aqueous muriatic acid (HCl). [34]Until the phlogiston theory was discarded, metals were commonly regarded as compounds of their minerals (“earths”) and phlogiston. This idea was incorrect, but it seemed to make sense, for the earths or ores seemed to be more fundamental than the metals.

After all, the earths were found readily in nature, but to obtain the metals one had to heat the earths strongly in the presence of charcoal. In any event, the metal came to be known as the regulus of the mineral; for example, the name antimony was originally applied to an antimony sulfide, Sb2S3, and the metal was called regulus of antimony. Lavoisier drops the term regulus, giving the simple body (the metal) the simple, unmodified term. [35]The element is now known as molybdenum. Similarly Lavoisier’s platina is now called platinum. The ending is important: the -um ending now denotes a metal, while the -a ending denotes an oxide of that metal. [36]Now tungsten. [37]All of these “earthy substances” proved to be compounds.

Their elements were first isolated in the early 19th century. Of course, Lavoisier was justified in including them among his elements, for none of them had yet been broken down into anything simpler. Two interesting omissions from this table are soda and potash, comounds of sodium and potassium known since antiquity but whose elementary metals had not yet been extracted. One might have expected Lavoisier to list such substances either here or with the hypothesized radicals (note 33). Chalk frequently refered to calcium carbonate (CaCO3), but apparently it was also used for calcium oxide [Oxford 1971]. Magnesia is magnesium oxide, MgO. (See note 35. Epsom salt is magnesium sulfate, MgSO4, so named for the location (an English town) of a mineral spring from which the salt was obtained. Barytes is barium oxide, BaO. Argill or argil is an aluminum-containing potters’ clay. Alum is a transparent aluminum-containing mineral, AlK(SO4)2. 12H2O. Humphry Davy was the first to isolate calcium, magnesium, barium, [Davy 1808b] sodium, and potassium [Davy 1808a]; he was also a co-discoverer of boron [Davy 1809] and he recognized chlorine to be an element (note 34). Vitrifiable means able to be made into glass; indeed, common glass is mainly silicon dioxide. [Weeks & Leicester 1968] Source: http://web. lemoyne. edu/~giunta/ea/lavprefann. html Antoine-Laurent Lavoisier

Antoine-Laurent Lavoisier. Line engraving by Louis Jean Desire Delaistre, after a design by Julien Leopold Boilly. Courtesy Blocker History of Medicine Collections, Moody Medical Library, University of Texas Medical Branch, Galveston, Texas. The son of a wealthy Parisian lawyer, Antoine-Laurent Lavoisier (1743–1794) completed a law degree in accordance with family wishes. His real interest, however, was in science, which he pursued with passion while leading a full public life. On the basis of his earliest scientific work, mostly in geology, he was elected in 1768—at the early age of 25—to the Academy of Sciences, France’s most elite scientific society.

In the same year he bought into the Ferme Generale, the private corporation that collected taxes for the Crown on a profit-and-loss basis. A few years later he married the daughter of another tax farmer, Marie-Anne Pierrette Paulze, who was not quite 14 at the time. Madame Lavoisier prepared herself to be her husband’s scientific collaborator by learning English to translate the work of British chemists like Joseph Priestley and by studying art and engraving to illustrate Antoine-Laurent’s scientific experiments. In 1775 Lavoisier was appointed a commissioner of the Royal Gunpowder and Saltpeter Administration and took up residence in the Paris Arsenal.

There he equipped a fine laboratory, which attracted young chemists from all over Europe to learn about the “Chemical Revolution” then in progress. He meanwhile succeeded in producing more and better gunpowder by increasing the supply and ensuring the purity of the constituents—saltpeter (potassium nitrate), sulfur, and charcoal—as well as by improving the methods of granulating the powder. Characteristic of Lavoisier’s chemistry was his systematic determination of the weights of reagents and products involved in chemical reactions, including the gaseous components, and his underlying belief that matter—identified by weight—would be conserved through any reaction (the law of conservation of mass).

Among his contributions to chemistry associated with this method were the understanding of combustion and respiration as caused by chemical reactions with the part of the air (as discovered by Priestley) that he named “oxygen,” and his definitive proof by composition and decomposition that water is made up of oxygen and hydrogen. His giving new names to substances—most of which are still used today—was an important means of forwarding the Chemical Revolution, because these terms expressed the theory behind them. In the case of oxygen, from the Greek meaning “acid-former,” Lavoisier expressed his theory that oxygen was the acidifying principle. He considered 33 substances as elements—by his definition, substances that chemical analyses had failed to break down into simpler entities.

Ironically, considering his opposition to phlogiston (see Priestley), among these substances was caloric, the unweighable substance of heat, and possibly light, that caused other substances to expand when it was added to them. To propagate his ideas, in 1789 he published a textbook, Traite Elementaire de chimie, and began a journal, Annales de Chimie, which carried research reports about the new chemistry almost exclusively. Antoine-Laurent Lavoisier conducts an experiment on human respiration in this drawing made by his wife, who depicted herself at the table on the far right. Courtesy Edgar Fahs Smith Memorial Collection, Department of Special Collections, University of Pennsylvania Library.

A political and social liberal, Lavoisier took an active part in the events leading to the French Revolution, and in its early years he drew up plans and reports advocating many reforms, including the establishment of the metric system of weights and measures. Despite his eminence and his services to science and France, he came under attack as a former farmer-general of taxes and was guillotined in 1794. A noted mathematician, Joseph-Louis Lagrange, remarked of this event, “It took them only an instant to cut off that head, and a hundred years may not produce another like it. ” Source: http://www. chemheritage. org/discover/online-resources/chemistry-in-history/themes/early-chemistry-and-gases/lavoisier. aspx Others: http://preparatorychemistry. com/Bishop_nomenclature_help. htm

Introduction

Acid and bases are two important classes of compounds that react to form a salt and water. When mixing acids and bases a precise amount of the base must be added in order to reach the equivalence point. At this point, one reactant has been exactly consumed by the addition of the other reactant. When performing chemical reactions chemists use a process called titration to determine the equivalence point of the reaction.

Once the equivalence point is known then the chemist can correctly determine the amount the concentration of the acid and the base. In this experiment acid-base titration will be used to determine the concentration of HCl at equilibrium when it reacts with the NaOH H+ (aq)+ Cl- (aq) + Na+ (aq) + OH- >H2O(l) + Na+ (aq)+ Cl- (aq)

Procedure

When performing this experiment one must first obtain and wear goggles. Next, add 40mL of distilled water to a 100mL beaker, then add 5. 00mL of HCl to the beaker. Then obtain 40mL of 0. 1M NaOH.

Place the NaOH in a 60mL reagent reservoir and drain a small amount into a 250mL beaker to fill the tip. Connect the Ph sensor to the LabQuest and set up the drop counter. Then calibrate the titrant by adjusting the reservoir tip to and letting the NaOH slowly drain into a graduated cylinder until 9 or 1o ml has been recorded. After the LabQuest has been calibrated discard the solution. The assemble the titration apparatus as shown in the picture below. Place the HCl solution onto the magnetic stirrer and slowly titrate the NaOH into the solution.

Start the data collection to calculate the volume of NaOH is added when the solution reaches its equivalence point. Then write down the calculations and disassemble the apparatus.

Discussion

My lab group and I completed this experiment by doing two trials. We found that both trials were concluded with similar results. In trial 1 we found that the volume of NaOH added to the solution was 4. 01ml before the largest pH increase, and 4. 05mL after. We calculated the volume at the equivalence point to be 4. 03mL. We found there were 4. 3×10-4 moles of NaOH and 4. 03×10-4 moles of HCl. Then we calculated the concentration of the HCl to be 0. 08 moles per liter. In trial 2 we found 4. 951mL of NaOH has added before the increase and 4. 992mL after. The volume at the equivalence point was 4. 971mL. There were 4. 971×10-4 moles of HCl and 4. 971×10-4 moles of NaOH. The concentration of HCl was found to be 0. 094 moles per liter. We found the average concentration to be 0. 08971M. Although the results of both trials in the experiment were similar the results were not exactly the same.

The mistake may have come from an error in measuring the HCl and distilled water. More HCl may have been added because we did not have an accurate pipet bulb. We used a graduated cylinder to add the HCl and may have had a more or less HCl than what was needed in the experiment.

Conclusion

The results of this experiment show that titration is an effective way to find the concentration of reactants in an acid-base reaction. Using the titration helped my group accurately calculate the volume of NaOH that was added to the solution, and helped us to correctly determine the correct concentrations.

Zirconium is a chemical element with the symbol Zr, atomic number 40 and atomic mass of 91. 224. The name of zirconium is taken from the mineral zircon, the most important source of zirconium. It is a lustrous, grey-white, strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and opacifier, although minor amounts are used as alloying agent for its strong resistance to corrosion. Zirconium forms a variety of inorganic and organometallic compounds such as zirconium dioxide and zirconocene dichloride, respectively.

Five isotopes occur naturally, three of which are stable. Zirconium compounds have no known biological role. ————————————————- Characteristics Zirconium is a lustrous, greyish-white, soft, ductile and malleable metal which is solid at room temperature, though it becomes hard and brittle at lower purities. In powder form, zirconium is highly flammable, but the solid form is far less prone to ignition. Zirconium is highly resistant to corrosion by alkalis, acids, salt water and other agents.

However, it will dissolve in hydrochloric and sulfuric acid, especially when fluorine is present. Alloys with zinc become magnetic below 35 K. Zirconium’s melting point is 1855 °C (3371 °F), and its boiling point is 4371 °C (7900 °F). Zirconium has an electronegativity of 1. 33 on the Pauling scale. Of the elements within d-block, zirconium has the fourth lowest electronegativity after yttrium, lutetium and hafnium. At room temperature zirconium exhibits a hexagonally close packed crystal structure, ? -Zr, which changes to ? Zr a body-centered cubic crystal structure at 863 °C. Zirconium exists in the ? -phase until the melting point. ZrZn2 is one of only two substances to exhibit superconductivity and ferromagnetism simultaneously, with the other being UGe2. World production trend of zirconium mineral concentrates Zirconium has a concentration of about 130 mg/kg within the Earth’s crust and about 0. 026 ? g/L in sea water. It is not found in nature as a native metal, reflecting its intrinsic instability with respect to water.

The principal commercial source of zirconium is the silicate mineral, zircon (ZrSiO4),which is found primarily in Australia, Brazil, India, Russia, South Africa and the United States, as well as in smaller deposits around the world. 80% of zircon mining occurs in Australia and South Africa. Zircon resources exceed 60 million metric tons worldwide and annual worldwide zirconium production is approximately 900,000 metric tons. Zirconium also occurs in more than 140 other minerals, including the commercially useful ores baddeleyite and kosnarite.

Zr is relatively abundant in S-type stars, and it has been detected in the sun and in meteorites. Lunar rock samples brought back from several Apollo program missions to the moon have a quite high zirconium oxide content relative to terrestrial rocks. ————————————————- zirconium ore processing flowsheet .The field of extractive metallurgy, mineral processing, also known as mineral dressing or ore dressing, is the process of separating commercially valuable minerals .

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titanium, zirconium graphite, fluorite, aedelforsite, phosphate ore metal, ferromanganese, coal, gangue, slag, zirconium level this is our company, a china grinding mill manufacturers. we are a professional iodine ore crusher equipment hafnium, zirconium, titanium, are purified by the van grinding mill series. raymond mill; mtm series trapezium mill ————————————————- zirconium ore flotation process itanium, zirconium, thorium, chromium, molybdenum, wolfram, and uranium, by froth flotation process metallic mineral collectors. a feasible froth flotation process is the process begins with froth flotation in a flotation plant to concentrate the ore minerals. of zircon zirconium silicate and columbite niobium and tantalum mineral following the successful development of a flotation process for producing an ree mineral concentrate in of the rare metals tantalum ta, niobium nb and zirconium zr the brief introduction of mineral flotation technique. rare mentaltantalum, niobium, titanium, zirconium the preliminary separation for asbestos ore. in the process and tin stone separation; 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manganese; molybdenum; nickel; niobium; silicon; vanadiumzircon, zrsio 4, the principal ore, is pure zro 2 of chloride with magnesium the kroll process, and power generation now takes more than 90% of zirconium metal production. material quantities in fig. 7. 9 are based on production of 1. ooo mol zirconium at point 6. eed to this process to produce reactor-grade zirconium from zircon ore the production processes used at primary zirconium and hafnium manufacturing plants after zircon ore is chlorinated, crude zirconium-tetrachloride and silicon mineral equipment manufacturing co. , ltd.. you may also find other gravity separation process/manganese ore jig gold ore jig/tungsten ore jig/titanium ore jig/zirconium while the scandium could be recovered from zircon ore by this process, it is of course best performed as a part of the production process for the zirconium metal, with mixture of potassium and potassium zirconium fluoride in a small decomposition process zircon, zrsio4, the principal ore, is more than 90% of zirconium metal production manufacturing & design purified metal using the iodide decomposition process. his process is still used today to purify zirconium chrome ore beneficiation process chrome ore the main flow of the production line of chrome ore is: zirconium ore how to choose your limonite ore in another method, the ore is fused with a caustic soda flux and continuous introduction to a suitable reduction process for the continuous production of zirconium and production line; 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I have decided to base my experiment on four different types of metals and four different liquids. I will be using a penny, nail, paper clip and a needle as my four metals. My four liquids will be vinegar, beach, lemon water and salt water. To get started, the metal contents should be established. Today’s pennies are mostly made of zinc with a thin layer of copper overcoating. A nail is a form of carbon steel or black iron. Paper clips are made from a low grade steel. A needle is made from stainless steel.

Examining the liquids and lemon juice is a citric acid. It should have corrosive actions on some of the metals, but not all. I believe that it will not affect this penny, except to clean it and shine it. I don’t think it will affect the paper clip either. I think that the only way it will have any affect on the needle or paper clip, will be if they were damaged or scratched. Corrosion would be caused If that were the case. I also think there were not to be any corrosion to the nail with lemon juice. Vinegar water is used to clean things.

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I don’t think the vinegar will rust a eedle, paper clip, nail, or penny the fastest. There will be a minimal affect on The steel material. The carbonation of water, vinegar and oxygen on the air will form iron oxide on the nail, the scientific name for rust. Vinegar will remove any corrosion and clean the penny. Bleach is a chloride, like vinegar, I think the affects will be minimal on Most of the metals. Since bleach contains oxygen, it would be most likely the liquids to rust the nail the fastest. The affect on the penny will be more like a cleaning agent, like vinegar and lemon uice, than as a corrosive.

I think that salt water will be the best Corrosive liquid. Salt water will cause corrosion faster because the salt will act as a catalyst steel up the change and erode the materials. I feel it would corrode all of the metals. The needle may be the only metal it may not affect it, like some other liquids, it may not rush unless the metal has been scratched deep. In conclusion, I think that salt water will be the most corrosive liquid and the nail made from carbon steel will be the most corrosive metal, in the least amount if time.

Strategic issues and options open to Avery In order to develop a future strategic decision plan we have assessed Crown’s business with a SWOT analysis, keeping in mind all issues Avery has to consider. That implies an evaluation of the different strengths, weaknesses, opportunities and threats of Crown Cork’s business.

The analysis is as follows: • Strengths: Crown’s return on equity and total return to shareholders was ranked much higher than its competitors’, creating high value to its customers; Crown has a tremendous skills in die forming and metal fabrication, and they can move to adapt to the customer’s needs faster than anyone else in the industry; Crown’s research teams also worked closely with customers on specific customer requests. Weaknesses: Growth slowing in metal containers; the possibility of diversifying beyond the manufacture of containers was not at hand, because while Crown’s competitors had aggressively expanded in a variety of directions, Crown had been cautious. • Opportunities: expand its product line beyond the manufacture of metal cans and closures, since industry observers forecast plastics as the growth segment for containers in the 90s; Avery also considered the growing opportunity in glass containers; the bidding for all or part of Continental Can would almost double its size and make them even more international. Threats: Avery knew that most mergers in this industry had not worked out well; the challenge of taking two companies that come from completely different cultures and bringing them together; Potential bidders for all, or part of Continental’s operations, included many of Crown’s U. S. rivals in addition to European competition; the continuing threat of in-house manufacture of metal cans. Regarding to the strategic options which are open to Avery, we have thought about three options as the most profitable and likely ones.

The first one would be to expand its product line beyond the manufacture of metal cans and closures, aiming its business to the plastic container segment which held much promise. The second option would be to merge with Continental Can. It would provide them such size in metal can industry that they would be the highest can metal manufacturing company in the globe. The last option would be to remain on the metal can industry without merging with Continental Can. This option would be the less profitable one, but on the other hand it would be the less risky one.

They would be able to try to improve even more its manufacturing process and taking advantage of its competitors’ diversification. The growth in metal can segment is supposed to be stuck, but maybe they would rise its market share reaching higher revenues to Crown’s shareholders. Metal container industry After the John Connelly’s reorganization and strategic changes, Crown competes in the metal containers industry, more specifically in the beverage cans market and the aerosol market.

To compete in this market, since the seventies, Crown has developed a conversion from steel to aluminum cans and manufacturing them with the two-pieces model. The metal container industry has changed considerably over the last years. Since 1981 to 1989 the market has grown from 88,810 to 120,795 million of cans. This means that this industry has experienced a grown of 36% over the past 8 years period, representing 61% of all packaged products in the United States in 1989.

For a better understanding of the metal container industry, we are going to present the Porter’s five forces analysis: – Threat of new competition. We considered this force low due to the industry’s high barriers to entry. Some of these barriers are: a) High initial capital investment: Each two- piece can line plus its peripheral equipment needed cost approximately $20-$25 million. b) Strong rivalry among competitors: five established and experienced firms dominated the industry with an aggregate 61% market share. ) Low operating margins due to aggressive discounts of competitors. Thread of substitute products: a) Plastics: plastic’s market share has grown from 9% in 1980 to 18% in 1989. Plastic’s light weight and convenient handling contributed to widespread consumer acceptance. b) Glass: In the beer category consumers had certain preference with glass bottle that would work to its advantage in the coming years. Bargaining power of buyers: There were large buyers such as Coca-Cola Company, Anheuser-Busch Companies, Inc. , PepsiCo Inc. , and Coca-Cola Enterprises Inc.

These buyers usually maintained relationships with more than one can supplier and they could punish poor service and uncompetitive prices by cuts in order sizes. In addition, many large brewers moved to hold can costs down by developing their own manufacturing capability. Bargaining power of suppliers: The country’s three largest aluminum suppliers were Alcoa, Alcan and Reynolds Metals. Aluminum prices increased by 15% while steel prices increased by 5% to 7%. – – – 1 – Intensity of competitive rivalry: In 1989, five firms dominated the metal can industry, with an aggregate 61% market share.

American National Can held 25% market share, followed by Continental Can (18%), Reynolds Metals (7%), Crown Cork & Seal (7%), and Ball Corporation (4%). Pricing was very competitive among them. Most companies offered volume discounts to encourage large orders. John Connelly’s thrust to success Connelly’s arrival to the presidency of Crown brought about important changes in the way the company operated, the actions he took were actually beneficial for the company, taking it from bankruptcy to a situation of annual profits with annual revenues growth about 12%.

To achieve the success, the company did not apply complex strategies, nor invested in neither revolutionary products nor innovative diversification; in his own words the plan was to apply “just common sense”. The company moved from a paternalistic leadership to a functional organization, Connelly also eliminated the divisional line and staff concept, he were able to reduce with this actions Crown’s payroll by 24% in less than two years. Another key to success was that they were focused on enhancing the existing product line.

Connelly was not interested in researching new materials or packaging, because of that he closed the Central Research Facility, and worked closely with large breweries in the development of two-pieces cans. Even though it was not a company based on innovation, Crown worked closely with their customers to provide them technical assistance and to satisfy their requests. To successfully carry out its policy of controlling costs and improving quality, Crown also needed to focus its growth policies in developing countries, taking advantage of new business opportunities to expand its market share.

Connelly emphasized national management wherever possible to develop the internationalization process. New challenges in the industry The most significant changes that are taking place in the industry are the more often using of plastic containers and glass bottles, and the diversification and subsequent consolidations due to low profit margins, excess capacity and rising material and labor costs within the metal can industry. Some competitors have invested in stuff such as insurance, energy exploration, glass containers or high-technology market.

In our opinion, Bill Avery should respond with a thorough market analysis, assessing each of Crown’s options to keep its market share and then choosing the most profitable in terms of revenues and duration. Only once they have done this analysis, they are able to make the correct decision, which can be to remain in the metal can industry, the diversification to other segments of the market, or to merge with Continental Can. That implies the need to think deeply in each option before make the decision of either change Connelly strategy or remain in the same market segment with the same strategy. 2

Ceramicss are inorganic and nonmetallic stuffs formed from metallic and nonmetallic elements whose interatomic bonds are either ionic or largely ionic. Many of the ceramics desirable belongingss are obtained normally by a high temperature heat intervention. Ceramicss are made up of two or more elements. In a crystalline construction is more complex than that of metals. When the bonding is largely ionic the crystal construction is made up of positively charged metallic ions, cations, negatively charged nonmetallic ions and anions. When the ions are bonded together the overall charge must be impersonal. To hold a stable system the anions in the construction that surround a cation must be in contact with that peculiar ion. There needs to be a ratio of the cation radius to the anion radius for the coordination and apprehension of the constructions geometry. If for illustration there is a deficiency of coordination, the cation would be falsely incased by the anions therefore doing a prostration in its expected structural stableness. There are many different types of constructions exist for ceramics. One crystal construction is the AX type where there are an equal figure of cations and anions. Another crystal construction that exists for ceramics has a different figure of cations and anions but still has a impersonal charge because the ions have different magnitudes of charge is called an AmXp construction. An AmBnXp construction has more than one type of cation, represented by A and B but merely one type of anion. This type of construction is besides seen in close wadding of ions in metals. Imperfections occur in the crystal construction of ceramics really similar to metal structural defects. Defects can happen in each of the two ions of the construction. At any clip there can be cation, anion interstitials, cation or anion vacancies. Most defects or imperfectnesss occur in braces to keep the electroneutrality. A Frenkel defect is a cation vacancy and cation interstitial brace. When a cation and anion vacancy brace occurs they are called a Schottky defect. Ceramicss can besides hold drosss in the crystal construction like metals.Figure 12.21 gives a conventional diagram of the Frenkel and a Schotkey defects ( pg 435 ) .In many instances ceramics tend to be really brickle which can take to ruinous failure with really few marks of weariness. This is due to the fact that ceramics absorb really small energy before they fracture. When ceramics are subjected to a tensile emphasis, they about ever break before any fictile distortion takes topographic point. Fracture occurs because of the formation and extension of clefts perpendicular to the applied burden. Ceramicss have a greater ability to defy compaction than tenseness. The modulus of snap lessenings with more pores in the ceramic stuff. When there are many pores in the stuff they act as emphasis concentrators which expose the stuff to weak part. However, ceramics are really difficult and are good for applications where abradant or crunching action is needed.

Most polymers are organic and are composed of hydrocarbons with interatomic forces that are represented as covalent bonds. Most polymers ironss are rather long and really complex. These long molecules are made up of repetition units which are repeated along the concatenation. The smaller repetition unit is called a monomer. Polymers can be made up of a individual repetition unit, called a homopolymer, or two or more different reiterating units called copolymers.

Polymers by and large have a really big molecular weight. These molecular ironss tend to hold many kinking, bending, and gyrating along with web with adjacent ironss may happen. This causes the result stuff to be really elastic. Polymer ironss can hold side groups which cause different constellations based on which side and with what regularity they bond. They can show a degree of crystallinity similar to the wadding of the molecular ironss to make an ordered atomic array. This crystal construction can be much more complex than metallic crystal constructions. Defects in polymers besides differ from those found in metals and ceramics. Defects in polymers are linked to the concatenation ends because they are somewhat different than the concatenation itself and emerge from the sections of the crystal. Polymers are really sensitive to strive rate, temperature, and chemical nature of the environment. Different polymers can exhibit different emphasis strain behaviour depending on the complexness of the molecular concatenation. Certain polymers display a degree of is brickle where break occurs before elastic distortion which is really similar in the instance of ceramics. Another type of polymers is really similar to metals where elastic distortion takes topographic point foremost followed by giving and fictile distortion. A 3rd type is exhibited by elastomers which have wholly elastic and recoverable distortion. Polymers by and large have a lower modulus of snap and tensile strength so metals. Some Polymers can be stretched up to ten times longer than its original province where metals and ceramics can non easy carry through. Polymers exhibit viscoelasticity at temperatures between where elastic and liquid like behaviours are prevailing. Similar to metals and ceramics, polymers can see weirdo. Creep is a clip dependent factor due to deformation under emphasis or elevated temperature. In both ceramics and polymers, creep depends on clip and temperature. Polymers may be malleable or brickle depending on temperature, strain rate, specimen geometry, and manner of lading which is really similar to the belongingss of metals. Polymers are brickle at low temperatures and have somewhat low impact strengths. Polymers can see weariness under a insistent burden. They are by and large softer than metals and ceramics and unlike metals and ceramics, polymer runing occur over a scope of temperatures alternatively at a specific temperature.

Metallic elements are a stuff made up of metallic elements that are bonded metallically similar common metal. The negatrons are non bound to any peculiar atom making a matrix of ion nucleuss surrounded by many negatrons. They are really good music directors of heat and electricity where as ceramics and polymers are missing. Polymers and metals are both malleable and are non that brickle though metals besides exhibit a degree of plasticity. Ceramicss are really brittle, they tend to fracture under a burden which means they are missing in ductileness. Polymers are the softest stuff due to their complex construction, while ceramics are the hardest but are non really tough because they fracture before fictile distortion occurs. Polymers plastically deform really easy and have the smallest Young ‘s modulus. Ceramicss have the highest value because of their crispness and ne’er reach the point of fictile distortion because they would fracture foremost. The values of Young ‘s modulus for metals fall between those for polymers and ceramics. These three stuffs have diverse constructions and exhibit different degrees of defects.

“ Alloying, ” utilizing the term in the broadest sense.

Simply an metal is a metal compound that consists of 2 or more metal or nonmetallic elements. These combinations of metallic and non metallic elements finally create new compounds that in consequence show superior structural belongingss as compared to the elements by themselves. The type of metal mixtures is extremely dependent on the coveted mechanical belongings of the stuff. Alloying can be applied to metals, ceramics and polymers where in each particular belongingss are desired.

One of the most coveted belongingss of metal metal is the hardenability. A stuff with a high degree of hardness will defy distortion caused by surface indenture or scratch while a stuff with a low hardness degree will deform more easy under similar conditions. The chief factor in a stuff ‘s hardenability is its martensite ( the rate which austenitized Fe C metals are formed when cooled ) besides content and is related to the sum of C in a stuff. With this application of debasing on metals, the stuff can exhibit greater strain and emphasis oppositions every bit good as snap. These belongingss are favourable when covering with building and fabrication procedures.

A ceramic metal is fundamentally a merger of a ceramic with of 2 or more metals. As seen in metal metals, ceramic metals can dwell of dross atoms in a solid province. In ceramic metals an interstitial and substitutional provinces are possible. In an interstitial type, the anion has to be bigger than the dross of the ionic radius. The substitutional dross applies where the dross atom normally forms a cation in the ceramic stuff therefore the host cation will be substituted.Figure 12.23 provides a great ocular representation of interstitial and substitutional types in a ceramic metal ( pg 437 ) .Significantly, to decently accomplish a solid province of solubility for replacing dross atoms, the charge and the ionic size must be as the same as the host ion. If they were different it there would necessitate to be some other manner for the electroneutrality to be maintained within the solid. An easy manner to make this is to make a formation of lattice defects of vacancies or interstitial of both ion types. Cobalt Cr is a perfect illustration of a ceramic metal in which was designed to be used for coronary intercessions therefore because it does non degrade one time placed in the human organic structure.

Polymer alloys consist of two or more different types of polymers in a sense blended together. There are a assortment of additives that can be blended or mixed in with the polymer to make the coveted consequence for the stuff. Polymer additives that support the alteration of its physical belongingss are fillers, plasticisers, stabilizers and of class fire retardents. Fillers are by and large introduced to a polymer, when a greater comprehensive strength and thermic stableness is desired. Making these types of metals are really good because they are by and large really easy to make and utilize in their coveted signifier. Plasticizers help better the flexibleness and stamina of polymers by cut downing the hardness and stiffness of the stuff. They are frequently introduced to polymers that are by and large brickle at room temperature. These additives are particularly utile because they by and large lower the glass passage temperature therefore leting the polymer to hold a extent of bendability. Due to the fact that certain polymers are non resilient to environmental conditions, stabilizers are introduced. They provide stableness and unity against impairment against the mechanical belongingss. The two most common signifiers of environmental impairment are UV exposure and oxidization. A major concern with many polymers is that they are extremely flammable. Fire retardents are introduced to such polymers to cut down the combustibleness of the stuff by interfering with its ability to burn through a gas stage or originating a different burning reaction that generates less heat. This procedure will cut down the temperature that would finally discontinue the combustion procedure.

Kirill Shkolnik

105940393

ESG 332 – R01

Exam # 2 ( Question # 2 )

Describe with mention to phase diagrams and disruption theory, how precipitation age hardening can be achieved in aluminium metals.

By and large aluminium is a metal with a low degree of denseness compared to other metals. Due to this low degree of denseness, it conducts electricity and heat better than Cu. Aluminums merely over 1200 grades Fahrenheit which is comparably low to other metals. Due to these simple facts, it seems ideal to bond elements such as Ti, Si, Cu, Zn and other stuffs to amplify aluminiums positive properties. The procedure precipitation age hardening can magnify the alloying of aluminium. This procedure involves supersaturating a solid solution precipitating equally dispersed atoms on the aluminium. This will assist halt the motion of disruptions within the metal construction. The basic construct of disruption is the atomic misalignment of atoms in a additive plane. These atomic misalignments affect a whole series of atoms on a plane. The series of misalign atoms form a line called a disruption line. There are two known types of disruption called the prison guard and border disruption. Screw disruption and border disruption are the primary types of disruptions but require a certain sum of each other to happen. By cut downing the sum of disruptions can radically increase the strength in the metal. The procedure of debasing normally makes a pure stuff harder. The procedure of debasing is holding one metal bond with dross atoms from other stuffs to alter its mechanical belongingss. An debasing procedure called solid solution debasing uses a solution to replace bonds inside the metal. The modification of disruption motion is a major factor for debasing because it can be used to beef up metals. Debasing metals with the precipitation hardening makes the strength of the new stuff stronger as the advancement of the procedure is delayed. The ground for precipitation hardening is sought after is because of its abilities in doing metals stronger.

Aluminum metals can hold precipitation in a really specific manner. Heat intervention occurs when one stuff is heated a supersaturated mixture at a specific stage and so two different stages can be present together. A precipitate signifiers in little pieces throughout the full stuff. When the mixture is at its equilibrium, the forming procedure comes to an terminal. The little pieces of precipitate so spread together to organize one big precipitate. This phase of the precipitate tends to weaken the stuffs cardinal construction. The little pieces of precipitate in the stuff make it harder for disruptions to travel. When strength of the stuff diminishes due to the motion of the precipitate it is called overaging.

There are two things need for heat interventions to be applied.Figure 11.21 provides a graphical representation the relationship between temperature and composing for aluminium and Cu ( pg 402 ) .The Cu stage represented at a shows a supersaturated solid solution in aluminium while the compound that between the two elements is symbolized as? . Interestingly the point M represents the max solubility point at certain temperature and composing in the stuff. Point N represents the solubility bound of a and ( a + ? ) L symbolizes the temperature needed for the solution to go a liquid. If a major sum of solute is made available in the solution, we would hold a precipitation hardened metal. The bound of the solubility curve immensely decreases in concentration as the temperature decreases.

There are two different ways precipitation can happen. One procedure is the usage heat intervention where the solute can be dissolved to organize a solid individual stage solution. This method can be done by heating an metal to a really high temperature.Figure 11.24 shows that the? stage is blended into a stage ( pg 404 ) .Then the metal is cooled where all that is left is a supersaturated a stage. Precipitation heat intervention the ( a + ? ) stage is heated to a specific temperature to let the? stage to precipitate. The metal is cooled and the hardness of the metal is determined by clip. A logarithmic map a comparing with strength and clip proves the dependance of temperature and strength.

Kirill Shkolnik

105940393

ESG 332 – R01

Exam # 2 ( Question # 3 )

Describe what is meant by the term “ glass passage temperature ” and exemplify your reply from polymer and ceramic point of position.

Typically a glass passage temperature is where a noncrystalline signifier of a polymer or a ceramic is cooled and transforms from a super cooled liquid into a glass. A ceramic or a glassy stuff is a noncrystalline stuff that becomes progressively more syrupy when it is cooled. Due to the fact that glassy stuffs are noncrystalline there is no definite temperature when the liquid will transform into a solid. Though, it is besides of import to observe that in noncrystalline stuffs the specific volume is dependent on temperature and will diminish with the temperature. The glass passage temperature displays a decrease in the rate at which the particular volume decreases with temperature. When the temperature is below this value, the stuff is in a ceramic from and straight above this point the stuff is considered a supercooled liquid. The glass passage temperature occurs in both glassy and semicrystalline polymers, but non in crystalline stuffs. As certain molecular ironss in noncrystalline stuffs temperature bead due to miss of gesture the glass temperature passage occurs. Basically glass passage is the clip in which a steady transmutation occurs from the liquid province to a somewhat rubberlike province and so to the concluding more stiff solid stuff. The glass passage temperature is the province in which the stuff goes from its rubbery to stiff province.

This passage can take topographic point in both waies. As a polymer for illustration is cooled to a stiff solid, it can be heated and undergo the same passage in contrary. As the stuff undergoes all of these alterations its belongingss change from province to province. Some stuffs can see greater alteration include the stiffness, heat capacity, and the coefficient of thermic enlargement for the stuff during this passage. The glass passage temperature besides acts as a bound boundary for applications of polymers and polymer matrix like constituents. If this temperature is beyond the stuff threshold, it will no longer suit the coveted belongingss the undertaking had called for and the application would be useless. The molecules that had been frozen in topographic point below the will both revolve and interpret at the temperatures above. Molecular features have an impact on the concatenation ‘s stiffness and will in bend affect the glass passage temperature for the stuff.

Some molecular features that can do the concatenation ‘s flexibleness to be reduced and the glass passage temperature to increase that include bulky side groups on the molecular concatenation. Besides these features can impact polar atoms or groups of polar atoms on the side of the molecular concatenation, dual bonds, and aromatic groups. The glass passage temperature will besides increase as the molecular weight of the stuff additions. Branching besides influences the of a stuff, many subdivisions will diminish the ironss mobility and addition, a lower denseness of subdivisions will do the to diminish as the molecular ironss will hold a freer scope of gesture.

Crosslinks can happen in glassy polymers and can impact, they cause the decrease of gesture and hence addition. If there are excessively many crosslinks occur in the stuff, the molecular gesture would be so limited that glass passage may non happen. It can be understood that many of the same molecular features which affect the glass passage temperature besides affect the thaw passage temperature. The two are affected in such a similar mode that is normally someplace between 0.5 to 0.8 times the runing passage temperature.Figure 15.19 demonstrates this mathematic relationship ( pg 548 ) .Both ceramic and polymers have a glass passage temperature. A glass can be referred to by several different names ; such as vitreous solid, an formless solid or glassy solid. An formless solid has the mechanical belongingss of a solid, but does non hold long scope molecular order where they are in gesture at a really slow rate that it be considered stiff for regular intents. When glassy stuffs have been supercooled below the glass passage temperature they will take on features similar to those of a crystalline solid. This solid will go stiff with an increased hardness and will be more brickle. However, if a glassy stuff is heated to above its glass passage temperature it will go softer and many of the intermolecular bonds will interrupt leting the stuff to flux at an increasing fluid viscousness. A polymer below the glass passage temperature is more stiff, but as it enters its glass passage stage, the stuff becomes more rubbery as its viscousness additions. The polymer can come in its glass passage at a lower temperature when critical factors that normally affect the gesture of the molecules in the stuff are non all present.

When molecular weight of a polymer additions, the glass passage temperature will besides increase. Many factors that increase the the gum elastic gasket would non make its occupation decently.

Polymers can exhibit the undermentioned constructions: formless, semi-crystalline and crystalline. Describe these constructions and explicate how the mechanical belongingss may be influenced by these structural signifiers for a polymer of the same chemical expression.

Polymers can develop formless, semi-crystalline and crystalline constructions of the same chemical expression. Polymers can be as liquids, semi solids, or solids related to the crystal constructions severally. However each of these constructions exhibit a assortment of different mechanical belongingss. The crystallinity of a polymer depends on the intermolecular secondary bonding which will to a great extent act upon the extent of any mechanical belongings of the polymer.

The tensile strength, elastic modulus and compaction strength of a crystalline construction will be stronger than a semicrystalline construction and significantly stronger than formless type construction.

For a crystalline construction the molecular ironss of the polymer are tightly packed together in an organized atomic group which take up infinite and will impact the polymers mechanical belongingss. These crystalline constructions are to a great extent influenced by the glass passage temperature. Besides the isomer and chemical expression lays out important factors that will be really of import in the formation of the bulk stuff construction.

From certain big bulky functional groups there becomes an at hand hinderance that will suppress the motion capableness of a molecule. This procedure will increase the energy demand for any stage alteration. The result of this procedure is a greater passage temperature. This new temperature passage will increase the opportunities for the formation of a crystalline construction. The ground for this is and clip p before the stuff becomes a disorganised liquid and requires a longer clip for the molecules to set up themselves decently. When polymers have many subdivisions the weaker the stuff will be, even though crystalline constructions are stronger than less ordered stuffs.Figure 15.18 demonstrates the alteration in these structural provinces when specific volume and temperature are compared ( pg 546 ) .Pure polymers have a really little runing point scopes and bond strength. Doped polymers and polymer metals will by and large hold wider runing point scopes. The procedure of ramification will diminish the strength of a polymer, which would continuously diminish the thaw point temperature. Though, the act of ramifying on to a great extent heavy subdivisions will diminish molecule mobility. Besides within this procedure the molecular weight is affected every bit good.

Kirill Shkolnik

105940393

ESG 332 – R01

Exam # 2 ( Question # 4 )

How are T-T-T and C-C-T diagrams used to plan heat intervention agendas for field C steels.

Time-Temperature-Transformation or T-T-T and uninterrupted chilling transmutation or

C-C-T are used for heat intervention agendas for field C steel. T-T-T are normally known as an isothermal transmutation diagrams can demo the alteration of different stages at certain temperatures. C-C-T can be used to cipher percent transmutation against the logarithm map through clip.

The usage the isothermal transmutation and uninterrupted chilling transmutation diagrams can be used to develop a heat intervention for field C steels. These diagrams will back up the apprehension of C steels through stage diagrams. When a construction is heat treated, its chilling procedure helps retain its construction. This procedure can be analyzed through T-T-T.Figure 10.13 displays a graphical representation of temperature against clip with a 3rd dimension with the per centum of the steel metal transformed to pearlite ( pg 326 ). The apprehension of a rapid chilling metal sully depends on the apprehension and application of heat intervention. It is understood that isothermal transmutations do non alter in temperature but uninterrupted chilling transmutation diagrams do. C-C-T and T-T-T display the same dimensions but over a larger spectrum of clip and temperature.Figure 10.28 shows different signifiers of steel metals ( pg 338 ) .A stuff that has been cooled to a temperature somewhat below its eutectoid temperature, and isothermal transmutation is maintained for an drawn-out period of clip, interestingly it can non be depicted on T-T-T diagrams in spheroid signifiers.