CHEM 1031 Chapter Notes - Chapter 2: Fluorine, Noble Gas, Molar Mass
23 Apr 2017
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Document Summary
Atoms are the smallest identifying unit of an element. There are about 91 different naturally occurring elements. Scientists have succeeded in making 20 synthetic elements. Antoine lavoisier formulated the law of conservation of mass. In a chemical reaction, matter is neither created nor destroyed. The total mass of the reactants will not change in the product. Joseph proust formulated the law of definite proportions. All samples of a given compound, regardless of their source or how they were prepared have the same proportions of their constituent elements. The law is sometimes called the law of constant composition. Mass ratio= (cid:2869)(cid:2874). (cid:2868) (cid:2870). (cid:2868) = 8. 0 or 8. 1. This ratio of water decomposing will have an oxygen and hydrogen product with a mass ratio that will hold for any sample of pure water regardless of its origin. John dalton formulated the law of multiple proportions.
