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Phase Changes

Phase Changes. Phase. Depends on strength of forces of attraction between particles. Energy and Changes to Matter. Exothermic Change: A + B → C + D + energy Energy is released or “ ex”its Endothermic Change: A + B + energy → C + D Energy is absorbed or “ en”ters.

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Phase Changes

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  1. Phase Changes

  2. Phase • Depends on strength of forces of attraction between particles. .

  3. Energy and Changes to Matter • Exothermic Change:A + B → C + D + energy • Energy is released or “ex”its • Endothermic Change:A + B + energy → C + D • Energy is absorbed or “en”ters

  4. Energy During Phase Changes • Solid Liquid, Liquid Gas • Endothermic • Energy is absorbed and overcomes attractive forces between particles

  5. Gas Liquid, Liquid Solid • Exothermic • As particles come closer together energy is released

  6. Absolute Zero • Temperature at which particles have slowed down so much they no longer possess any kinetic energy. This is not possible! 0 Kelvin -273° Celsius

  7. http://www.kentchemistry.com/links/Matter/HeatingCurve.htm

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