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Changing the temperature of a material is not the only process that involves heat. In this section, we'll examine the process of changing phase; first we'll look at heating and cooling curves as a way to express the changes occuring with the addition (or removal) of heat from a material and then we'll do some calculations involving heat and phase changes. Changes in energy heat Potential Energy The temperature will NOT increase during phase changes. During a phase change, the heat is making the solid turn to liquid or the liquid turn to steam rather than increasing the temperature. 1306a, b, c Heat and Heat Calculations wkstKey. doc Thermochemistry Worksheet Energy changes involving phase changes Sample Problem: How much energy is needed to convert 23. When solving problems involving phase changes, it is helpful to draw a diagram to visualize the different steps involved. 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