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| anything that occupies space and has mass |
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| pure substance that cannot be broken down into other substances by chemical or physical means |
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| element critical to health that makes up less than 0.01 percent of body mass |
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| substance containing two or more elements chemically combined in a fixed ratio |
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| smallest particle of an element |
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| subatomic particle with a single unit pf positive electric charge (+) |
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| subatomic particle with a single unit of negative electric charge (-) |
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| subatomic particle that has no charge (is electrically neutral) |
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| in an atom, the central core that contains protons and neutrons |
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| number of protons in an atoms nucleus; is unique for each element |
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| one of several forms of an element, each containing the same number of protons in their atoms but different number of neutrons |
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| isotope in which the nucleus decays (breaks down) over time, giving off radiation in the form of matter and energy |
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| chemical bond that occurs when an atom transfers and electron to another atom |
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| atom that has become electrically charged as a result of gaining or losing an electron |
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| chemical bond that forms when two atoms share electrons |
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| two or more atoms held together by covalent bonds |
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| breaking of old and formation of new chemical bonds that result in new substances |
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| starting material for a chemical reaction |
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| material created as a result of a chemical reaction |
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| molecule in which opposite ends have opposite electric charges |
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| bond created by the weak attraction by a slightly positive hydrogen atom to a slightly negative portion of another molecule |
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| tendency of molecules of the same kind to stick to one another |
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| attraction between unlike molecules |
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| total amount of energy associated with the random movement of atoms and molecules in a sample of matter |
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| measure of the average energy of random motion of particles in an object |
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| uniform mixture of two or more substances |
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| substance in a solution that dissolves the other substance and is present in the greater amount |
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| substance in a solution that is dissolved and is present in a lesser amount |
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| solution in which water is the solvent |
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| compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale |
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