MCAT General Chemistry Question 65: Answer and Explanation
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Question: 65
5. Which of the following experimental methods should NEVER affect the rate of a reaction?
- A. Placing an exothermic reaction in an ice bath.
- B. Increasing the pressure of a reactant in a closed container.
- C. Putting the reactants into an aqueous solution.
- D. Removing the product of an irreversible reaction.
Correct Answer: D
Explanation:
The question asks which of the following does NOT affect the rate of the reaction. Temperature directly affects the rate constant (k), making choice (A) incorrect. Changing the partial pressure of a gas will affect the number of effective collisions per time. This makes choice (B) incorrect—but note that concentration changes will not affect the rate of zero-order reactions. Solvents affect the rate of reactions depending on how the reactants interact with the solvent, making choice (C) incorrect. Removing the product of an irreversible reaction, choice (D), should not affect the rate of the reaction because the rate law does not depend on the concentrations of products.