Collision is the movement of the molecule in a reaction. During a collision, a short-lived structure formed is an activated complex.
An activated complex is a transitional state that is produced when the species of the reactant molecule collide and combine to produce species with unstable energy.
A catalyst is a species that speeds the chemical reaction, a reagent is any species in a chemical mixture that takes part in the product formation and the inhibitor is a species that impedes the reaction to occur.
Therefore, activated complexes are short-lived structures.
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