Energy of Phase Changes

AP Chemistry· difficulty 2/5

Which segment requires q = m\cdotc\cdotΔT (no phase change)?

A
$Segment B (plateau, melting)$
B
$Segment A or C (sloped, single phase)$
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C
$All segments equally$
D
$Segment D only$

Explanation

Sloped segments (no plateau) correspond to heating one phase; q = m\cdotc\cdotΔT applies. Plateaus require q = n\cdotΔH(phase).

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