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| A chemical reaction is a process that changes, or transforms, one set of chemicals into another. |
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| Reactants are the elements or compounds that enter into a chemical reaction. |
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| A product is the elements or compounds produced by a chemical reaction. |
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| Activation energy is the energy that is needed to get a reaction started. |
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| A catalyst is a substance that speeds up the rate of a chemical reaction. |
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| Enzymes are proteins that act as biological catalysts. |
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| Substrates are the reactants of enzyme-catalyzed reactions. |
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