Physical Science: Chapter 4, sec 2
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Transcript

  • 1. Chapter 4 Changes of State
  • 2. Warm-Up 10/14/10
    • Two pots of boiling water each cook an egg. One pot is at a high elevation. The other pot is at sea level. It takes one minute longer to hard-boil the egg at high elevation. Why?
    • (Think pressure and temperature)
  • 3. Energy and Changes of State
    • A change of state is the change of a substance from one physical form to another.
    • To change from one state to another you must add of remove energy (heat).
  • 4.  
  • 5. Melting / Freezing
    • Freezing point – liquid changes into solid.
    • Melting Point - solid changes into liquid.
      • Same Temperature
      • Water : 0º C
  • 6. Evaporation/ Boiling
    • Evaporation: liquid at the surface changes into gas
      • Can happen below boiling point
    • Boiling: liquid throughout changes into gas.
  • 7. Pressure
    • Pressure effects states of matter too:
      • Less pressure = lower boiling point
      • More pressure = higher boiling point
  • 8. Boiling / Condensation
    • Boiling : liquid to gas
    • Condensation : gas to liquid
    • Same temperature : Water 100º C
  • 9. Sublimation
    • When a substance goes directly from a solid to a gas.
    • (Dry Ice)
  • 10. Homework
    • Section Review:
      • Copy down the questions
      • Page 119, # 1-7