A heating curve for some substance is shown below. Which of the line segments (I-V) represents heating of the liquid?

Question

Quizplus · Accepted Answer

The line segment III represents heating of the liquid because during this segment, the temperature remains constant as the substance absorbs heat energy and undergoes a phase change from liquid to gas. Lines I, II, IV, and V represent different stages of heating or cooling of the substance in its solid and gas states.

A Heating Curve for Some Substance Is Shown Below