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Investigations 7 5

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Transcript

  • 1. Response Sheet – Phase Change
    • Wax is not turning into water – it is melting
    • When a solid material is heated enough, it changes phase to a liquid
    • Added heat increases the kinetic energy which causes the bonds holding the particles to break and form a liquid
  • 2. Gas to Solid
    • If water boils and turns into gas, where does it go?
    • What does water vapor look like?
    • When water turns into water vapor, a gas, is it still water or is it something else?
    • How can you tell if water vapor is present?
  • 3. Set-up Small cup Warm water – NOT TOUCHING BOTTOM OF SMALL CUP Crushed ice Large cup
  • 4. GET SUPPLIES
    • Supply tray
    • Hot water
    • Ice (no more than ½ cup)
  • 5. What do you see?
    • What is it made up of?
    • Where did it come from?
    • What is happening at the particle level?
  • 6. What do you see?
    • Condensation
    • GAS LIQUID
    • Evaporation
    • LIQUID GAS
  • 7. WHY?
    • Where did the water that condensed on the ice cup come from?
    • Why did it condense there?
    • How could we create
    • another phase change?
  • 8. What is happening?
    • After the salt is added, DON’T touch the water-ice system for several minutes.
  • 9. Water and Ice Observations
    • Water went through 3 phase changes
      • Liquid  Gas
      • Gas  Liquid
      • Liquid  Solid
  • 10. Vocabulary – Page 55
    • Energy Transfer : movement of energy from hot to cold
    • Calorie: unit of measurement for energy transfer (measures heat)
    • Equilibrium: energy transfer is equal, no change is taking place
    • Conservation of Energy : energy can’t be created or destroyed
  • 11. Vocabulary – Page 55
    • Phase Change : change from one phase of matter to another, requires heat to be added or taken away
    • Freezing : change from a liquid to a solid
    • Melting : change from a solid to a liquid
    • Evaporation : change from a liquid to a gas
    • Condensation : change from a gas to a liquid
  • 12. Page 54