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Understanding Energy and Phase Changes in Matter

Explore the relationship between energy and phase changes in matter, including exothermic and endothermic reactions. Learn how energy affects the transition between solid, liquid, and gas states. Discover the concept of absolute zero and its implications. Visit the link for more details.

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Understanding Energy and Phase Changes in Matter

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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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