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Antoine-Laurent de Lavoisier ( August 26 1743 - May 8 1794) was a French nobleman prominent in the histories of chemistry, finance, biology, and economics. He stated the first version of the Law of Conservation of Matter, recognized and named oxygen ( 1778), disproved phlogiston theory, and helped to reform chemical nomenclature. Lavoisier is often referred to as the father of modern chemistry. He was also an investor and administrator of the Ferme Générale, a private tax collection company; chairman of the board of the Discount Bank (later the Banque de FranceThe Banque de France is the central bank of France; it is linked to the European Central Bank (ECB). Its main charge is to implement the interest rate policy of the European System of Central Banks (ESCB). Linkage with the ESCB On June 1, 1998, a new inst); and a powerful member of a number of other aristocratic administrative councils.1 Early life
Born to a wealthy family in ParisEiffel Tower has become the symbol of Paris throughout the world. Paris is the capital and largest city of France. The city is built on an arc of the River Seine, and is thus divided into two parts: the Right Bank to the north and the smaller Left Bank to, Antoine Laurent Lavoisier inherited a large fortune when his mother died. He attended the College Mazarin from 1754Events June 19 The Albany Convention of New England Colonies proposes an American Union Duke of Saxony takes the Colditz Castle to his own use Change of emperor of the Ottoman Empire from Mahmud I ( 1730-1754) to Osman III (1754- 1757) Beginning of the Fr to 1761Events January 16 British capture Pondicherry, India from the French. February 8 Earthquake in London breaks chimneys in Limehouse and Poplar March 8 Second earthquake in North London, Hampstead and Highgate In Dutch Guayana a “state” formed by escaped sl, studying chemistry, botanyBotany is the scientific study of plants. As a branch of biology, it is also sometimes referred to as plant science(s or plant biology . Botany covers a wide range of scientific disciplines that study the growth, reproduction, metabolism, development, dis, astronomyAstronomy which etymologically means " law of the stars," (from Greek: + nomos) is a science involving the observation and explanation of events occurring outside Earth and its atmosphere. It studies the origins, evolution, physical and chemical propertie, and mathematicsMathematics is commonly defined as the study of patterns of structure, change, and space; more informally, one might say it is the study of "figures and numbers". In the formalist view, it is the investigation of axiomatically defined abstract structures. His first chemical publication appeared in 1764Events January 19 John Wilkes is expelled from the House of Commons for seditious libel February 15 The American city of St. Louis is established. Births February 11 Joseph Chenier, French poet (+ 1811) March 13 Charles Grey, 2nd Earl Grey, Prime Minister. In 1767 he worked on a geological survey of Alsace-Lorraine. He was elected a member of the French Academy of Sciences in 1768. In 1771, he married 13-year-old Marie-Anne Pierette Paulze, who translated from English for him, illustrated his books, and assisted him in his research.
2 Chemistry
Portrait of Monsier Lavoisier and his Wife, by Jacques-Louis David
Beginning in 1775, he served on the Royal Gunpowder Administration , where his work led to improvements in the production of gunpowder and the use of agricultural chemistry by designing a new method for preparing saltpeter.
Some of Lavoisier's most important experiments examined the nature of combustion, or burning. Through these experiments, he demonstrated that burning is a process that involves the combination of a substance with oxygen. He also demonstrated the role of oxygen in metal rusting, as well as its role in animal and plant respiration: working with Pierre-Simon Laplace, Lavoisier conducted experiments that showed that respiration was essentially a slow combustion of organic material using inhaled oxygen. Lavoisier's explanation of combustion replaced the phlogiston theory, which postulates that materials release a substance called phlogiston when they burn. He also discovered that the inflammable air of Henry Cavendish which he termed hydrogen (Greek for water-former), combined with oxygen to produce a dew, as Joseph Priestley had reported, which appeared to be water. Lavoisier's work was partly based on the work of Priestley (he corresponded with Priestley and fellow members of the Lunar Society). However, he tried to take credit for Priestley's discoveries. This tendency to use the results of others without acknowledgment, then draw conclusions is said to be characteristic of Lavoisier. In Sur la combustion en general (On Combustion, 1777 and Considérations Générales sur la Nature des Acides, 1778), he demonstrated that the "air" responsible for combustion was also the source of acidity. In 1779, he named this part of the air oxygen (Greek for acid-former), and the other azote (Greek for no life). In Reflexions sur le Phlogistique, 1783, Lavoisier showed the phlogiston theory to be inconsistent.
Lavoisier's experiments were among the first truly quantitative chemical experiments ever performed; that is, he carefully weighed the reactants and products involved, a crucial step in the advancement of chemistry. He showed that, although matter changes its state in a chemical reaction, the quantity of matter is the same at the end as at the beginning of every chemical reaction. He burnt phosphorus and sulfur in air, and proved that the products weighed more than the original. Nevertheless, the weight gained was lost from the air. These experiments provided evidence for the law of the conservation of matter. Lavoisier also investigated the composition of water and air, which at the time were considered elements. He discovered the components of water were oxygen and hydrogen, and that air was a mixture of gases - primarily nitrogen and oxygen. With the French chemists Claude-Louis Berthollet, Antoine Fourcroy and Guyton de Morveau, Lavoisier devised a chemical nomenclature, or a system of names describing the structure of chemical compounds. He described it in Méthode de nomenclature chimique (Method of Chemical Nomenclature, 1787). Their system facilitated communication of discoveries between chemists of different backgrounds and is still largely in use today, including names such as sulfuric acid, sulfates, and sulfites.
His Traité Élémentaire de Chimie (Elementary Treatise of Chemistry, 1789, translated into English by Robert Kerr) is considered to be the first modern chemical textbook, and presented a unified view of new theories of chemistry, contained a clear statement of the Law of Conservation of Mass, and denied the existence of phlogiston. Also, Lavoisier clarified the concept of an element as a simple substance that could not be broken down by any known method of chemical analysis, and he devised a theory of the formation of chemical compounds from elements. In addition, it contained a list of elements, or substances that could not be broken down further, which included oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc, and sulfur. It also forms the basis for the modern list of elements. His list, however, also included light and caloric, which he believed to be material substances. While many leading chemists of the time refused to believe Lavoisier's new revelations, the Elementary Treatise was written well enough to convince the younger generation.
Lavoisier's fundamental contributions to chemistry were a result of a conscious effort to fit all experiments into the framework of a single theory. He established the consistent use of chemical balance, used oxygen to overthrow the phlogiston theory, and developed a new system of chemical nomenclature which held that oxygen was an essential constituent of all acids (which later turned out to be erroneous). For the first time the modern notion of elements is laid out systematically; the three or four elements of classical chemistry gave way to the modern system, and Lavoisier worked out reactions in chemical equations that respect the conservation of mass (see, for example, the nitrogen cycle). His contributions are considered the most important in advancing the science of chemistry to the level of what had been achieved in physics and mathematics.
