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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.
The simple act of mixing chemicals can be a physical one if they do not react. For it to be a chemical change a reaction has to occur and it has to have a change in odor, colo â¦ r, temperature, or has the formation of gas or a precipitate to technically have changed chemically.