MCAT General Chemistry Question 219: Answer and Explanation

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Question: 219

4. Which factor always affects both thermodynamic and kinetic properties?

A. Temperature
B. Transition state energy level
C. Reactant coefficients of the overall reaction
D. No single factor always affects both thermodynamics and kinetics.

Correct Answer: A

Explanation:

A Choice B is purely a kinetic factor and can be eliminated. Choice C is eliminated because it dictates the thermodynamic quantity K_eq but not necessarily the kinetics of the overall reaction (only of the rate limiting step). Gibbs free energy, a thermodynamic property, is defined as ∆G = ∆H – T∆S, and the Arrhenius equation defines the rate constant k, a kinetic property, as k = Ae^(–^E^a/^RT⁾. Both equations contain the T variable representing temperature. Therefore, choice A is correct and choice D must be incorrect.

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