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AP Chemistry
6.5 Energy of Phase Changes
6.3 Heat Transfer and Thermal Equilibrium
IntermediateMCQGraphicalConceptual18.9k
Heating curve for the thermal-storage substance
Heating curve for the thermal-storage substance
A student evaluates a pure molecular substance for use in a thermal-storage device. The initially solid sample is heated at constant pressure, and the student records its temperature as energy is added. The resulting heating curve is shown.

Which statement correctly describes the primary changes in the particles’ average kinetic energy and potential energy during regions III and IV of the graph?

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