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6 Cards in this Set
- Front
- Back
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Chemical Reaction
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the transformation of a substance or substances into one or more new substances
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Law of Conservation of mass
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mass is neither destroyed nor created 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 is known
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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
ex. Carbon dioxide vs. monoxide - two oxygen to one |
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Dalton's Atomic Theory (5 Points)
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- All matter is composed of extremely small particles called atoms
- 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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- all matter is composed of atoms
- atoms of any one element differ in properties form atoms of another element if remained unchanged atoms are divisible into smaller particles |
