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14 Cards in this Set
- Front
- Back
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Law of Conservation of Mass |
The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes |
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Law of definite proportions |
The law that states that a chemical compound always contain the same elements in exactly the same proportions by weight or mass |
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Law of multiple proportions |
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 the ratio of small whole numbers |
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Atom |
The smallest unit of an element that maintains the chemical properties of that element |
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Nuclear Forces |
The interaction that binds protons and neutrons, protons and protons, and neutrons and neutrons together in the nucleus |
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Atomic Number |
The number of protons in the nucleus of an atom; atomic number is the same for all atoms of an element |
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Isotope |
An atom that has 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 number ) |
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Mass Number |
The sum of the numbers of protons and neutrons that make up the nucleus of an atom |
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Nuclide |
An atom that is identified by the number of protons and neutrons in its nucleus |
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Atomic Mass Unit |
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 |
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Average Atomic Mass |
The weighted average of the masses of all naturally occurring isotopes of an element |
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Mole |
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 |
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Avogadro's number |
The number of atoms or molecules in 1 mol |
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Molar mass |
The mass in grams of 1 mol of a substance |
