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5 Cards in this Set
- Front
- Back
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Law of conservation of mass
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mass is neither created nor destroyed during ordinary chemical reactions or physical changes
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Law of definite proportions
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a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
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Law of multiple proportions
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if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
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Dalton's Atomic Theory
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All matter is composed of extremely small particles called atoms.(1808)
Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed. Atoms of different elements combine in simple whole-number ratios to form chemical compounds. In chemical reactions, atoms are combined, separated, or rearranged. |
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Modern Atomic theory
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Atoms are divisible into even smaller particles
all matter is composed of atoms Atoms of any one element differ in properties from atoms of another element. A given element can have atoms with different masses. |
