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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.
A catalyst can speed up the rate of a given chemical reaction by  lowering the activation energy required for the reaction to occur.  However, the catalyst does not change tâ¦he total free energy from  reactants to products. Answered by The WikiAnswersÂ® Community. Making the world better, one answer at a time.