Examine the heating curve for water in Section 12.7 (Figure 12.36). Explain why the curve has two segments in which heat is added to the water but the temperature does not rise.

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Temperature (°C) 125 100 75 50 25 0 -25 Ice warming 0.941 kJ/mol | | Melting point Ice melting to liquid 6.02 kJ/mol Boiling point 10 4-11 Ice 20 A FIGURE 12.36 Heating Curve for Water Liquid water warming 7.52 kJ/mol Water I 40 30 Heat added (kJ/mol) Liquid water vaporizing to steam 40.7 kJ/mol I 50 5 Steam warming 0.905 kJ/mol I 60 Vapor 70