CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics
Problem
For the reversible reaction C ⇌ D, a solid catalyst is added. Which of the following best explains why the position of equilibrium is unaffected?
(a) The catalyst lowers the activation energy for the forward reaction more than for the reverse reaction, but temperature compensates so K stays constant
(b) Because the catalyst is not consumed during the reaction, it cannot alter the energy profile in either direction, so the equilibrium composition remains the same
(c) The catalyst lowers the activation energy for both the forward and reverse directions by the same amount, leaving ΔE unchanged
(d) The catalyst decreases the overall enthalpy change (ΔH∘), which keeps the equilibrium constant unchanged