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

AP Chemistrymediummcq1 pt

Why does ice melt spontaneously above 0 °C even though melting is endothermic?

A.The entropy increase outweighs the enthalpy cost at higher T

B.Melting becomes exothermic above 0 °C

C.Ice's entropy is higher than water's

D.The surroundings do work on the ice

Explanation

Core Concept

Melting has ΔH > 0 but ΔS > 0; above 0 °C the TΔS term exceeds ΔH, making ΔG negative. Entropy drives the transition.

Correct Answer

AThe entropy increase outweighs the enthalpy cost at higher T

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