Explanation:
Activation energy is defined as the minimum amount of energy required by the reactant molecules to undergo a chemical reaction.
Whereas when some molecules of reactants does not even have the minimum amount of energy then they are not able to participate in the chemical reaction. As a result, rate of reaction becomes slow.
But when we add a catalyst into the reaction then there will be a decrease in activation energy and as a result, molecules will lesser amount of energy are able to participate in the reaction. Hence, rate of reaction increase upon addition of a catalyst.
