4. Which of these affects the equilibrium constant, K.q. r - 1 1 a. concentration b. pressure c. volume d. temperature e. all of the above He autem involving a reversible reaction, 5. When a catalyst is added to a chemical system involving a reversible reaction, the catalyst 1 ! 1 1 1 a increases the rate of reaction in both directions b. increases the rate of reaction in the forward direction only c increases the rate of reaction in the reverse direction only d. has no effect on the rate of reaction in either direction e shifts equilibrium in one direction