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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.
Share to: To catalyze a reaction means to speed it up. Enzymes speed up reactions by bringing together the chemicals that are needed to react, rather than waiting for them to bump intoâ¦ each other by chance. If it weren't for enzymes, most reactions in living cells would happen too slowly to be useful. 7 people found this useful.