Question

(4 points)
True False
At the label 'A" the substance is at the lowest recorded kinetic energy.


Between label 'D' and 'E' the substance could be both condensing and vaporizing.


Label 'C' indicates a 'boiling point' for this substance.


This substance "melts" at point 'B'.


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Answer 1

1. True — A is the coldest point (lowest temperature → lowest average kinetic energy).

2. True — the segment between D and E is a phase-change plateau between liquid and gas, so with heating it would vaporize and with cooling it would condense.

3. False — C is not the boiling point (the boiling plateau is between D and E); C is a region outside that plateau.

4. True — B is the melting (solid → liquid) phase-change point/plateau.