Term
| law of conservation of mass |
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Definition
| mass is neither created nor destroyed during ordinary chemical and physical reactions |
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Term
| law of definite proportions |
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Definition
| a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or the source of the compound |
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Term
| law of multiple proportions |
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Definition
| if two or more different compounds are composed of teh 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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Term
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Definition
| the smallest unit of an element that maintains the properties of that element |
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Term
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Definition
| a unit of mass that is exactly 1/12 the mass of a carbon-12 atom |
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Term
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Definition
| 6.022 x 1023, the number of particles in exactly one mole of a pure substance |
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Term
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Definition
| The total number of protons and neutrons in the nucleus of an isotope |
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Term
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Definition
| the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12 |
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Term
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Definition
| the number of protons in the nucleus of each atome of an element |
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Term
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Definition
| atoms of the same element that have different masses |
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Term
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Definition
| the mass of one mole of a substance |
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Term
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Definition
| the general term for any isotope of any element; another term for an atom that is identified by the number of protons and neutrons in its nucleus |
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Term
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Definition
| the weighted average of the atomic masses of the naturally occurring isotopes of an element |
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