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When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.
1 Higher reaction rates. 2  Reactions that take advantage of an enzymes ability to speed up the reaction often have rates which are 10 6 to 10 12 times faster than the corresponding uncatalyzed reactions. 3  The reaction rate with enzymes are still several times greater than those using standard chemical agents as catalysts. Higher reaction rates. 2  Reactions that take advantage of an enzymes ability to speed up the reaction often have rates which are 10 6 to 10 12 times faster than the corresponding uncatalyzed reactions. 3  The reaction rate with enzymes are still several times greater than those using standard chemical agents as catalysts.