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Phase Changes

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  1. Phase Changes Courtesy www.lab-initio.com

  2. CA Standards • Students know energy is released when a material condenses or freezes and is absorbed when a material evaporates or melts.

  3. constant Temperature remains __________ during a phase change. Water phase changes

  4. Effect of Pressure on Boiling Point

  5. Phase Diagram • Represents phases as a function of temperature and pressure. • Critical temperature: temperature above which the vapor can not be liquefied. • Critical pressure: pressure required to liquefy AT the critical temperature. • Critical point: critical temperature and pressure (for water, Tc = 374°C and 218 atm).

  6. Phase changes by Name

  7. Water

  8. Phase Diagram for Carbon dioxide Carbon dioxide

  9. Carbon Phase Diagram for Carbon

  10. Phase Diagram for Sulfur

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