Explain how and why will the rate of reaction for a given reaction be affected when

Question 9:Explain how and why will the rate of reaction for a given reaction be affected when

a. a catalyst is added
b. the temperature at which the reaction was taking place is decreased

The correct answer is -a.The rate of reaction will increase. The catalyst decreases the activation energy
of the reaction therefore the reaction becomes faster. (1/2+1/2)
b.The rate of reaction will decrease. At lower temperatures the kinetic energy of
molecules decreases thereby the collisions decrease resulting in a lowering of
rate of reaction.