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Definition
| anything that occupies space and has mass |
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| a pure substance that can not be broken down by chemicals |
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| elements that make up less than 0.01% of your body mass |
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| substance containing two or more elements that are chemically combined in a fixed ratio |
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| A substance containing two or more elements that are chimically combined |
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| smallest possible particle of an element |
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| a single unit with a positive charge |
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| a particle with a negative charge |
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| particle that has a neutral charge |
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| a central core where protons and neutrons are packed together |
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| number of protons in the nucleus |
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Definition
| one of several forms of an element, each containing the same number of protons in their atoms but a 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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Definition
| chemical bond that occurs when an atom transfers an 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 of 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 a substance |
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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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Definition
| compound that removes H+ ions from an aqueous solution and that measures more than 7 on the pH scale |
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| a range of numbers used to describe how acidic or basic a solution is; ranges from 0 (most acidic) to 14 (most basic) |
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Definition
| substance that maintains a fairly constant pH in a solution by accepting H+ ions when their levels rise and donating H+ ions when their levels fall |
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