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13 Cards in this Set
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The law that states that mass cannot be created or destroyed in ordinary chemical or physical changes |
Law of conservation of mass |
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The law that states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass |
Law of definite proportions |
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The law that states that when two elements combine to form two or more compounds, the mass of one element that combines with a given mass of the other is in ratio of small whole numbers |
Law of multiple proportions |
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The smallest unit of an element that maintains the chemical properties of that element |
Atom |
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The interaction that binds protons and neutrons, protons and protons, and neutrons and neutrons together in a nucleus |
Nuclear forces |
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The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element |
Atomic number |
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An atom that had the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass) |
Isotope |
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An atom that is identified by number of protons and neutrons in its nucleus |
Nuclide |
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A unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 of the mass of a carbon atom with mass number 12 |
Atomic mass unit |
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The weighted average of the masses of all naturally occurring isotopes of an element |
Average atomic mass |
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The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 G of carbon – 12 |
Mole |
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6.02x 10 23 The number of atoms or molecules in 1 mol |
Avogadro number |
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The mass in grams of 1 mol of a substance |
Molar mass |
