If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant

Question

If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant

there will be no effect on the:
(1) rate of the forward reaction
(2) rate of the reverse reaction
(3) activation energy of the reaction
(4) heat of reaction

4, am i right ?

Answer 1

No, option (4) is not correct. The addition of a catalyst to a system at equilibrium will not have any effect on the heat of reaction. The correct answer is option (2) - the rate of the reverse reaction. Adding a catalyst will increase the rate of both the forward and reverse reactions equally, which means the equilibrium will be reached faster but the position of the equilibrium will not be affected.

Answer 2

No, the correct answer is (3) activation energy of the reaction. When a catalyst is added to a system at equilibrium, it provides an alternative reaction pathway with a lower activation energy. This means that more collisions between the reactant molecules will have sufficient energy to overcome the activation energy barrier and proceed to the products. As a result, the rate of both the forward and reverse reactions will increase, but the equilibrium position (and thus the rates of the forward and reverse reactions) will remain unchanged. The addition of a catalyst does not affect the heat of reaction, which is the difference in energy between the products and reactants.