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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.
What is necessary for a decomposition reaction to occur? A decomposition reaction needs the addition of a catalyst or heat to proceed. For instance hydrogen peroxide will break down into water and oxygen gas in the presence of a cat â¦ alyst; and calcium carbonate will break down into calcium oxide and carbon dioxide gas when heated.