8th Grade Chapter 5 Lesson 4

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  • 1. 8 th Grade Chapter 5 Lesson 4 Pgs. 206-218 For Student Use Only
  • 2. Heat and Phase Change
    • Three States of Matter:
      • Solid
      • Liquid
      • Gas
    • Changes due to a loss or gain of heat
  • 3. Heat and Phase Change
    • Solids to Liquids= melting
      • This point is called the melting point
    • Liquid to Solid= freezing
      • This point is called the freezing point
      • Freezing point is affected by solutes
  • 4. Heat and Phase Change
    • Latent Heat
      • Solid to liquid produces no temperature change
        • This is called latent heat
    • Heat of fusion
      • Heat required to turn a certain amount of solid into a liquid without changing temperature
  • 5. Heat and Phase Change
    • Evaporation and Condensation
      • Evaporation- liquid to a gas
        • Factors that affect evaporation
          • Higher temperatures
          • Greater surface area
          • Air speed over a liquid
  • 6. Heat and Phase Change
    • Evaporation
      • Liquids that evaporate quickly are volitile
      • Liquids that evaporate slowly are involitile
  • 7. Heat and Phase Change
    • Internal Evaporation
      • Evaporation that takes place in the liquid as opposed to the usual surface
      • Requires high heat
      • This is also called boiling
        • When evaporation is throughout the liquid
        • Boiling Point- when boiling takes place
  • 8. Heat and Phase Change
    • Boiling:
      • Evaporation will not occur any quicker above 100 degrees
    • Pressure:
      • Affects the boiling point
      • Control the pressure and control the boiling point
  • 9. Heat and Phase Change
    • Pressure Cooker:
      • Uses pressure to make food cook faster
    • Heat of Vaporization:
      • Heat required to change a given amount of liquid into a gas without raising the temperature
  • 10. Heat and Phase Change
    • Condensation:
      • Gas changing into a liquid
      • This happens when warm things get cold
    • Saturation Point
      • When amount of water evaporating equals the amount of condensing
  • 11. Heat and Phase Change
    • Evaporation and Condensation
      • Heat flows from higher to lower concentration
      • Refrigeration is using heat and condensation
  • 12. Heat and Phase Change
    • Principles of Refrigeration:
      • When a gas is compressed its temperature rises
      • When a gas is allowed to expand its temperature falls
      • When a liquid evaporates it absorbs heat from the surroundings
      • When a gas condenses is releases heat into its surroundings
  • 13. Heat and Phase Change
    • Sublimation:
      • A gas changing directly into a solid
    • 4 th State of Matter:
      • Plasma- super heated gas