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AP Chemistry
6.5 Energy of Phase Changes
BeginnerMCQGraphicalConceptual17.3k
Heating curve for a pure molecular substance heated at a constant rate.
Heating curve for a pure molecular substance heated at a constant rate.
A pure molecular substance initially in the solid state is heated at a constant rate under an external pressure of \(1.0\text{ atm}\). The temperature of the sample as a function of time is recorded, producing the heating curve shown in the graph.

Which of the following best describes the energy changes occurring within the substance during segment \(\text{IV}\)?

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