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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.
Key Concepts. 1  The rate of a chemical reaction is the speed with which reactants are converted to products. 2  Collision Theory is used to explain why chemical reactions occur at different rates. 3  Collision Theory states that in order for a reaction to proceed, the reactant particles must collide.