Apentix/AP Chemistry/Unit 9: Applications of Thermodynamics/Question

AP Chemistryeasymcq1 pt

A reaction is thermodynamically favored in the forward direction at 300 K. What must be true of the reverse reaction at the same temperature?

A.It is unfavored, with positive ΔG

B.It is favored too, since favorability is symmetric

C.It is favored only when the reaction is endothermic

D.Favorability cannot be judged without rate data

Explanation

Core Concept

Reversing an equation negates every state-function change, so ΔG(reverse) = −ΔG(forward). A negative forward ΔG becomes positive in reverse at the same temperature, meaning the backward direction cannot proceed without outside input. Favorability is directional information tied to the sign of ΔG, not a property of the substances alone.

Correct Answer

AIt is unfavored, with positive ΔG

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