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Changes of State units: J/g Heat of Vaporization

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Presentation on theme: "Changes of State units: J/g Heat of Vaporization"— Presentation transcript:

1 Changes of State units: J/g Heat of Vaporization
the heat required to change one gram of a substance from a liquid to a gas Heat of Fusion the heat required to change one gram of a substance from a solid to a liquid units: J/g note: g x J/g = Joules

2 Changes of State Heat of Vaporization Heat of Fusion
when a substance vaporizes, energy is needed. when a substance condenses, energy is released. Heat of Fusion when a substance melts, energy is needed. when a substance freezes, energy is released.

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