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| when one or more substances change to produce one or more different substances. |
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| a substance or molecule that participates in a chemical reaction. |
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| a substance that forms in a chemical reaction. |
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| the sum of all the chemical processes that occur in an organism. |
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| the amount of energy needed to start a reaction. |
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| chemical substance that reduces the amount of activation energy that is needed for a reaction to take place. |
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| a protein or RNA molecule that speeds up metabolic reactions without being permanently changed or destroyed. |
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| reaction in which electrons are transferred between atoms; also known as an oxidation-reduction reaction. |
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| a chemical reaction in which a reactant loses one or more electrons such that the reactant becomes more positive in charge. |
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| a chemical change in which electrons are gained, either by the removal of oxygen, the addition of hydrogen, or the addition of electrons. |
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