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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.
Catalysts speed up the rate of a reaction, but do not have an affect on the equilibrium position. Evaluate the effect of a catalyst on a chemical equilibrium. 1  Catalysts are compounds that accelerate the rate of a reaction.  Catalysts accelerate reactions by reducing the energy of the rate-limiting transition state.