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For the water heating curve, when water is changing from solid to liquid form and from liquid to vapor form, the temperature remains constant. Even though the extra heat is being used to break down the bonds between the molecules, why isn't there at least a slight increase in temperature?
When water is undergoing a change from solid to liquid or liquid to gas, all of the heat supplied during that time is used to break the bonds. Thus, the temperature only increases as the solid, liquid, or vapor continues to heat.
The heat being used to change phases is only used to break the bonds because it takes a lot of energy to do so. This is shown by the horizontal line on the water heating curve. Temperature only increases during solid, liquid, and gas phases.
during the change of state, there is an initial rise all of the energy supplied through heat is used in breaking bonds, thus there is none residual to increase the temperature. Once all the bonds are broken, then the energy supplied can be used to increase the temperature of the substance as the change of state has occurred.
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