Heating curve of water to scale, against heat added

An example figure from the Heating and Cooling Curve generator.

Heating curve of 100 g of water against heat added in kJ, its boiling plateau much longer than its melting plateau, with blank lines to label each segment — The temperature of 100 g of water heated from ice at −20 °C to steam at 120 °C, against the heat added in kJ, drawn to scale from water’s specific heats and enthalpies of fusion and vaporization. The boiling plateau at 100 °C is almost seven times as long as the melting plateau at 0 °C, each temperature written by its dashed line. Each segment has a blank line for students to name its state.

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Answer key

Water: melting point 0 °C, boiling point 100 °C
A–B: Solid warms from −20 °C to 0 °C, 4.18 kJ
B–C: Melting at 0 °C, 33.35 kJ
C–D: Liquid warms from 0 °C to 100 °C, 41.8 kJ
D–E: Boiling at 100 °C, 225.69 kJ
E–F: Gas warms from 100 °C to 120 °C, 3.72 kJ

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