Solids, Liquids, and Gases

AP Chemistry· difficulty 2/5

A heating curve shows temperature vs heat added for water, with two flat plateaus.

What occurs along the longer second plateau (at 100 °C)?

A
$Heating of liquid.$
B
$Melting (ice \to water).$
C
$Heating of steam.$
D
$Vaporization (water \to steam).$
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Explanation

The plateau at 100 °C is vaporization. ΔH_vap is much larger than ΔH_fus, so this plateau is longer.

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