Term
| Law of Definite Proportions |
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Definition
| (Law of constant composition) a pure compound, whatever its source, always contains definite or constant proportions of the elements by mass. |
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Term
| Law of Multiple Proportions |
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Definition
| when two elements form more than one compound, the masses of one element in these compounds for a fixed mass of the other element are in ratios of small whole numbers. |
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Definition
| a particular atom characterized by a definite atomic number and mass number. |
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Definition
| the fraction of the total number of atoms that is composed of a particular isotope. |
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Definition
| the group of atoms or ions explicitly symbolized in the formula. |
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Definition
| an ion formed from a single atom. |
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Definition
| a compound composed of only two elements. |
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Definition
| a definite group of atoms that are chemically bonded together-- that is, tightly connected by attractive forces. |
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Definition
| a compound that contains water molecules weakly bound in its crystals. |
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Definition
| (Formula Weight, FW) the sum of the atomic weights of all atoms in a formula unit of a compound. |
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Definition
| the mass of one mole of substnace. In grams, it is numerically equal to the formula weight in atomic mass units. |
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Definition
| (MW) the sum of the atomic weights of all the atoms in a molecule. |
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Definition
| (amu) a mass unit equal to exactly one-twelfth the mass of a carbon-12 atom. |
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