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A cooling curve is the opposite of a heating curve.It shows how the temperature of a substancechanges with time, as it is cooled from a gas to asolid. Here is the cooling curve for one substance:gasTemperature / °C78liquidnoJOTOqidto be04-15-1solidTimeBib 25a What is the state of the substance at roomtemperature (20 °C)?b Use the list of melting and boiling points onpage 9 to identify the substance.c Sketch a cooling curve for pure water. d10