MCAT General Chemistry Question 84: Answer and Explanation
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Question: 84
9. Which of the following actions does NOT affect the equilibrium position of a reaction?
- A. Adding or subtracting heat.
- B. Adding or removing a catalyst.
- C. Increasing or decreasing concentrations of reactants.
- D. Increasing or decreasing volumes of reactants.
Correct Answer: B
Explanation:
The equilibrium of a reaction can be changed by several factors. Adding or subtracting heat, choice (A), would shift the equilibrium based on the enthalpy change of the reaction. Increasing reactant concentrations would shift the equilibrium in the direction of the product, and the opposite would occur if reactant concentrations were decreased, eliminating choice (C). Changing the volume of a reactant would affect any reaction with gaseous reactants or products, eliminating choice (D). While adding or removing a catalyst would change the reaction rate, it would not change where the equilibrium lies.