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17 Cards in this Set
- Front
- Back
element
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A substance that consists of identical atoms (ex. carbon, hydrogen)
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Compound
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A pure substance made up of two or more elements in fixed ratio to mass (ex. water)
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Mixture
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A combination of two or more pure substances (ex. blood, gasoline)
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Atoms
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Tiny, indivisible particles that make up all matter
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Molecule
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A tightly bound combination of two or more atoms that act as single unit
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Law of conservation of mass
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Matter can neither be created nor destroyed
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Law of constant composition
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Any compound is always made up of elemtns in the same proportion by mass
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Monatomic elements
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Elements that consist of single atoms that are not connected to each other
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Diatomic elements
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Two atoms of the same element per molecule - Hydrogen, Nitrogen, Flourine, Chlorine, Bromine, Oxygen and Iodine
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Polyatomic elements
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More than three atoms per molecule
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Proton
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A subatomic particle with a charge of +1 and a mass of approximately 1 amu: it is found in the nucleus
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Electron
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A subatomic particle with a charge of -1 and a mass of approximately .0005 amu: it is found in the space surrounding the nucleus
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Neutron
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A subatomic particle a mass of approximately 1 amu and a charge of zero: it is found in the nucleus
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Mass Number
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Sum of the number of protons and neutrons in the nucleus
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Atomic number
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Number of protons in the nucleus of an atom
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Isotopes
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Atoms with the same number of protons but a different neutrons
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Atomic weight
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A weighted average of the masses (in amu) of its isotopes found on the Earth
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