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2008 Phase Changes
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2008 Phase Changes

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  • 1. Phase Changes November 10, 2009
  • 2. Objectives
    • Describe each of the five phase changes
    • Define melting, freezing, vaporization, condensation, sublimation
  • 3. What is a physical change?
    • Physical changes involve the changing of physical properties such as color, shape, phase, texture, hardness, odor
    • Type of matter remains the same
  • 4.  
  • 5.
    • Let’s take a closer look with water.
    When water is frozen it is ice, a solid. (0 °C) When ice is melting, it is heating up. Melted ice is a liquid. TEMPERATURE LOW HIGH Once the ice has melted you have liquid water. (1-99 °C) If you heat the water more it becomes steam, a gas. (0 °C)
  • 6. Phase changes
    • melting
    • freezing
    • vaporization
    • condensation
    • sublimation
  • 7. Melting
    • Phase change from a solid to a liquid
    • The temperature in which this occurs is the melting point
  • 8. Freezing
    • Phase change of a liquid to a solid
    • The temperature in which this occurs is the freezing point
  • 9. Vaporization
    • Phase change from a liquid to a gas
    • Evaporation - particles vaporize from the top
    • Boiling - particles vaporize throughout; occurs at boiling point
  • 10.  
  • 11. Condensation
    • phase change from a gas to a liquid
  • 12. Sublimation
    • Sublimation is a phase change from solid to a gas
    • Dry ice and iodine are examples solids that undergo sublimation
  • 13.
    • Physical changes between the states of matter can be produced by heating and cooling.
  • 14. http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=30 Heat goes into the solid as it sublimates. Sublimation Solid to gas Heat leaves the gas as it condenses. Condensation Gas to liquid Heat goes into the liquid as it vaporizes. Vaporization, which includes boiling and evaporation Liquid to gas Heat leaves the liquid as it freezes. Freezing Liquid to solid Heat goes into the solid as it melts. Melting Solid to liquid Heat Movement During Phase Change Term for Phase Change Description of Phase Change Heat goes into the solid as it sublimates. Sublimation Solid to gas Heat leaves the gas as it condenses. Condensation Gas to liquid Heat goes into the liquid as it vaporizes. Vaporization, which includes boiling and evaporation Liquid to gas Heat leaves the liquid as it freezes. Freezing Liquid to solid Heat goes into the solid as it melts. Melting Solid to liquid Heat Movement During Phase Change Term for Phase Change Description of Phase Change

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