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Topic : Chemistry

Learn about different types of phase changes and the associated energy changes: melting, vaporization, condensation, freezing, sublimation. Understand the heat absorption or release in each process. Watch informative videos to enhance your knowledge.

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Topic : Chemistry

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  1. Topic: Chemistry Aim: Explain the different types of phase changes and the energy changes involved. Do Now: ON NOTES SHEET HW: Ditto – Periodic Tables Families Review (last page of Periodic Table Notes Packet)

  2. http://www.youtube.com/watch?v=XaDxwe8l3us&feature=related

  3. Phase Changes • Involves the absorption OR release of heat (energy).

  4. Substance absorbs heat energy

  5. Melting • Solid  liquid • Solid ABSORBS heat energy Substance absorbs heat energy

  6. Melting points of different substances • Iron: 1536ºC • Gold: 1063ºC • Glucose: 150ºC • Urea: 132-134ºC

  7. Vaporization • Liquid  gas • Liquid ABSORBS heat energy • When it occurs on surface of liquid: evaporation GAS Liquid absorbs heat energy LIQUID

  8. Boiling points of different substances • Alcohol (Ethanol): 79ºC • Iodine: 184.3ºC • Mercury: 356.9ºC • Olive oil: 300ºC • Jet fuel: 163ºC

  9. Condensation • Gas  liquid • Gas LOSES heat energy GAS Gas loses heat energy LIQUID

  10. Freezing • Liquid  solid • Liquid LOSES heat energy Substance loses heat energy

  11. Sublimation • Solid  Gas • No liquid phase • Ex: dry ice GAS Solid absorbs heat energy Solid

  12. Moth balls commonly undergo the process of sublimation. Sublimation is the process in which a solid changes directly to its gaseous phase, skipping the liquid phase.

  13. And an animation of the phase changes of water

  14. Let’s summarize… • List the different types of phase changes. 2. Explain what happens to heat energy in each phase change.

  15. 1. When a liquid becomes a solid, energy • does not change • is released • is absorbed • is first absorbed, then released

  16. 2. _______ is the process in which liquid changes to gas below the boiling point.   Sublimation Condensation Evaporation Combustion

  17. 3. On a hot day, the outside of a glass containing a cold drink becomes frosty. When touching the glass, it feels • water that has passed through the glass • water that has condensed from a gas in the air • water that has solidified • water that has absorbed energy

  18. 4. The change of a liquid to a solid is called freezing Melting sublimation vaporization

  19. 5. During which of the following processes is there a decrease in the heat content of the form of water indicated? • Ice as it forms on a lake • Water droplets as they fall to the ground • Water as it evaporates from a pond • Snow as it melts on a mountainside

  20. 6. When substances go directly from the solid phase to the gas phase, the phase change is called sublimation condensation evaporation vaporization

  21. E D condensing 100 boiling C Temperature º C. B freezing 0 melting A Heat (thermal energy)

  22. http://www.youtube.com/watch?v=vDZhUkp30tE&feature=related

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