1700-1800+AD

Antoine-Laurent de Lavoisier
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Antoine Lavoisier was born on August 26 in 1743 to a wealthy family in Paris, France. He then inherited this wealth when he was five when his mother passed away. He went on to get a good education at College Mazarin, and studied botany, chemistry, mathematics, and astronomy. " He stated the first version of the law of conservation of mass, recognized and named oxygen (1778) and hydrogen (1783), abolished the phlogiston theory, helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature. He discovered that, although matter may change its form or shape, its mass always remains the same" ([] ). Lavoisier passed away on May 8, 1794.

[|en.wikipedia.org/wiki/Torbern_Olof_Bergman] ==== Tobern Bergman was a Swedish chemist, born on March 20, 1735 in Katrine-berg, Sweden, he received his education at the University of Uppsala, and got his Ph.D. "Bergman greatly contributed to the advancement of quantitative analysis, and he developed a mineral classification scheme based on chemical characteristics and appearance. He is noted for his research on the chemistry of metals, especially bismuth and nickel.In 1771, four years after Joseph Priestley first created artificially carbonated water, Bergman invented a process to make carbonated water from chalk by the action of sulfuric acid" ( **//[|en]//**[|. wikipedia.]**//[|org/ wiki/ Torbern_Olof_Ber gman] ). Tobern died on July 18, 1784 in Medevi, Sweden. //** ====

**Joseph Priestly**

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Joseph Priestly was born on March 13, 1733 in Birstall England. Priestly wrote several papers, one of which was "Experiments relating to Phlogiston and the seeming Conversion of water into air" (1783). "The first part attempts to refute Lavoisier's challenges to his work on oxygen; the second part describes how steam is "converted" into air. After several variations of the experiment, with different substances as fuel and several different collecting apparatuses (which produced different results), he concluded that air could travel through more substances than previously surmised, a conclusion "contrary to all the known principles of hydrostatics". This discovery, along with his earlier work on what would later be recognized as gaseous diffusion, would eventually lead John Dalton and Thomas Graham to formulate the kinetic theory of gases."([|en.wikipedia.org/wiki/Joseph_Priestley#Chemical_Revolution] ). He is also credited for the discovery of oxygen because he was able to isolate it in its gaseous state with his invention of soda water. Priestly passed away on February 6, 1804.