Ch_2-1_Intro_to_chemistry

Ch_2-1_Intro_to_chemistry - FE1 400 B.C. -/-/- 1600 A.D....

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E1 ——//———//— 400 B.C. 1600 A.D. Early Greeks Aristotle Democritus Galileo (1546-1642 Italy) • Closest to first scientist • Nature understood through mathematics • Supported Copernicus’ view on solar system; 1632 called to Rome; renounced
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1. Elements are composed of extremely small particles called atoms. All atoms of a given element are identical, having the same size, mass, and chemical properties. The atoms of one element are different from the atoms of all other elements. 2. Compounds are composed of atoms of more than one element. In any compound, the ratio of the numbers of atoms of any two of the elements present is either an integer or a simple fraction. 3. A chemical reaction involves only the separation, combination, or rearrangement of atoms; it does not result in their creation or destruction. DALTON’S ATOMIC THEORY
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Law of definite proportions (1799 by Joseph Proust,' a French chemist): different samples of the same compound always contain its constituent elements in the same proportion by mass.
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Ch_2-1_Intro_to_chemistry - FE1 400 B.C. -/-/- 1600 A.D....

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