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If the Kp value for a reaction is significantly greater than 1, what can be inferred about the equilibrium position?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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Equilibrium constant Kp for homogeneous systems (A-level only)

Question

If the Kp value for a reaction is significantly greater than 1, what can be inferred about the equilibrium position?

Answer

A Kp value significantly greater than 1 indicates that the products are favored at equilibrium. This means that the concentration of products is much higher than that of the reactants, suggesting that the reaction proceeds almost to completion. This answer is anchored to Kp and partial pressure (A-level only).

Explanation

A Kp value significantly greater than 1 indicates that the products are favored at equilibrium. This means that the concentration of products is much higher than that of the reactants, suggesting that the reaction proceeds almost to completion. is the best answer because it directly supports the AQA A-Level Chemistry objective to interpret Kp values in terms of equilibrium position. This reasoning is anchored to Kp and partial pressure (A-level only) in Equilibrium constant Kp for homogeneous systems (A-level only), and it separates equilibrium position 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.

Common mistake

Misinterpretation of Kp Values

Students often confuse high Kp values with a reaction that goes to completion, rather than understanding that a high Kp indicates a greater concentration of products at equilibrium.

To fix this, students should remember that Kp values indicate the ratio of products to reactants at equilibrium, not the extent of the reaction. A high Kp means products are favored, but it does not imply that reactants are completely consumed. Keep the correction anchored to Kp and partial pressure (A-level only) and the objective: Interpret Kp values in terms of equilibrium position.

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