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If the substance reaches its boiling point, melting point, or freezing point, that makes it clear the substance undergoes a phase change. In other instances, sometimes the problem will tell us that the substance, melted, froze, or evaporated.
Natalie Benitez 1E wrote:What calculation do we also have to incorporate when going from a gas to a liquid or vice versa?
When calculating q for the reaction you can use the phase change graph and calculate the different q for both the heating and the phase change to calculate the q for the phase change from liquid to gas or the heat that would be released when going from gas to liquid.
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