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10 Cards in this Set
- Front
- Back
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Elements
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A pure substance that is made entirely from one atom
Eg: |
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Compounds
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Are pure substances made up entirely from two or more elements that are chemically combined
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Law of Conservation of Energy
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Mass cannot be created nor destroyed in ordinary chemical of physical changes
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Law of definite proportion
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A chemical compound always contains the same elements in exactly the same proportion by weight or mass
Eg: C12H22O11 |
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Law of multiple proportions
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When two elements combine to form two or more compounds, the mass of one element combined with the given mass of the other is in the ratio of whole numbers
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Dalton's theory 1
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All matter is composed of extremely small particles called atoms, atoms cannot be created, subdivided or destroyed
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Dalton's theory 2
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Atoms of a given element are identical in their physical and chemical properties
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Dalton's theory 3
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Atoms of different elements differ in their physical and chemical properties
Eg: Nitrogen has 7 and Oxygen has 6 |
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Dalton's theory 4
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Atoms of different elements combine in simple, whole-number ratios to form compounds
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Dalton's theory 5
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In chemical reactions, atoms are combined, separated or rearranged, but never created, destroyed or changed
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