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When a catalyst is involved in the collision between the reactant molecules, less energy is required for the chemical change to take place, and hence more collisions have sufficient energy for reaction to occur. The reaction rate therefore increases.Collision theory is closely related to chemical kinetics.hen a catalyst is involved in the collision between the reactant molecules, less energy is required for the chemical change to take place, and hence more collisions have sufficient energy for reaction to occur. The reaction rate therefore increases. Collision theory is closely related to chemical kinetics.
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.