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Physical Science: Chapter 4, sec 2
 

Physical Science: Chapter 4, sec 2

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Notes from 10/14/10

Notes from 10/14/10

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    Physical Science: Chapter 4, sec 2 Physical Science: Chapter 4, sec 2 Presentation Transcript

    • Chapter 4 Changes of State
    • 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)
    • 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).
    •  
    • Melting / Freezing
      • Freezing point – liquid changes into solid.
      • Melting Point - solid changes into liquid.
        • Same Temperature
        • Water : 0º C
    • Evaporation/ Boiling
      • Evaporation: liquid at the surface changes into gas
        • Can happen below boiling point
      • Boiling: liquid throughout changes into gas.
    • Pressure
      • Pressure effects states of matter too:
        • Less pressure = lower boiling point
        • More pressure = higher boiling point
    • Boiling / Condensation
      • Boiling : liquid to gas
      • Condensation : gas to liquid
      • Same temperature : Water 100º C
    • Sublimation
      • When a substance goes directly from a solid to a gas.
      • (Dry Ice)
    • Homework
      • Section Review:
        • Copy down the questions
        • Page 119, # 1-7