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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.
Reactions are not impossible without enzymes. Enzymes do not change during reactions, nor do they change the other contents of the reaction. They just speed up the rate at which all parts of the reaction react. In a chemical reaction, the reaction is said to be completed when equilibrium is reached.