Explain why catalysts do not change the position of equilibrium in a chemical reaction.

Catalysts increase the rate of both the forward and reverse reactions equally. This means that while they speed up the attainment of equilibrium, they do not alter the concentrations of reactants and products at equilibrium. As a result, the position of equilibrium remains unchanged. This answer is anchored to Equilibrium and Le Chatelier's principle.

Catalysts increase the rate of both the forward and reverse reactions equally. This means that while they speed up the attainment of equilibrium, they do not alter the concentrations of reactants and products at equilibrium. As a result, the position of equilibrium remains unchanged. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain why catalysts do not change the position of equilibrium. This reasoning is anchored to Equilibrium and Le Chatelier's principle in Chemical equilibria, Le Chatelier's principle and Kc, and it separates change from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.