Examine the heating curve for water in Section 12.7 (Figure 12.36). Explain the significance of the slopes of each of the three rising segments. Why are the slopes different?

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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