For an exothermic reaction to be non spontaneous at high temperatures,the enthalpy must be ________ while the entropy is ________.
A)positive,also positive
B)positive,negative
C)a relatively small negative value,also negative
D)a relatively large negative value,positive
E)a very large negative value,also negative

Question

Quizplus · Accepted Answer

For an exothermic reaction to be non-spontaneous at high temperatures, the enthalpy change must be negative (indicating it releases heat), and the entropy change must also be negative (indicating a decrease in disorder). This combination can lead to a situation where, at high temperatures, the TΔS term in the Gibbs free energy equation (ΔG = ΔH - TΔS) becomes large enough to make ΔG positive, thus making the reaction non-spontaneous.

For an Exothermic Reaction to Be Non Spontaneous at High