Consider the heating curve for water. At what temperature does the solid start melting? –20°C 0°C 20°C 80°C

0°C

Explanation:

The melting point of water - the temperature at which solid water begins to melt - is 0°C at a pressure of 1 atm. In the heating curve of water, below 0°C we have solid water. Then, at 0°C the solid water starts to melt by forming liquid water. Above 0°C, when the total amount of water is in the liquid state, the liquid water begins to heat (it increases its temperature).

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