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Phases of Matter. 4 of them…What are they. Solids- Have a definite shape and definite volume. Atoms are very tightly packed together Liquid- Atoms are not packed as tightly. Free to move. They take the shape of its container. Have a definite volume but no definite shape Gas-

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4 of them what are they
4 of them…What are they
  • Solids-
    • Have a definite shape and definite volume. Atoms are very tightly packed together
  • Liquid-
    • Atoms are not packed as tightly. Free to move. They take the shape of its container.
    • Have a definite volume but no definite shape
  • Gas-
    • Does not have a definite shape or volume. Tend to spread far away from another, but can also be packed very tightly together.
  • Plasma
    • Very rare on earth. Has extremely high energy and dangerous to living things. Examples are the suns and stars.
phase changes
Phase Changes
  • Solids have less energy than liquids.
  • Liquids have less energy than gas
  • In order to change phases, energy either has to be added or removed.
there are 5 phase changes
There are 5 phase changes
  • Melting
  • Freezing
  • Vaporization
  • Condensation
  • sublimation
slide6
Melting
  • The change of a solid to a liquid.
    • Occurs when a substance absorbs energy.
    • Point at which solid changes to a liquid is called it’s “melting point”
    • Why do we pour salt on icy side walks?
      • Lowers the freezing point. The water won’t freeze

Until the temp reaches -20 degrees.

  • The opposite occurs when liquid changes to a solid.
    • Freezing. Substance loses energy.
    • Why do we use anti-freeze in cars?
      • Again, it lowers the freezing point so that the car’s engine doesn’t freeze up.

Ice vs salt

vaporization
Vaporization
  • The change of a substance from a liquid to a gas.
    • Liquid needs to absorb energy in order to change into gas.
    • Boiling water. What happens if you boil a pot of water overnight?
      • All the liquid water changes to gas
condensation
Condensation
  • If a substance in the gas phase loses energy, it changes into a liquid.
  • Some examples:
    • Ice cold drinks
    • Bus windows
    • Walls of a tent at night
    • Dehumidifier
sublimation
Sublimation
  • When an object goes from a solid to a gas.
    • It skips the liquid phase.
  • Dry Ice-what is it?
    • Solid carbon dioxide (CO2)
    • We normally only see carbon dioxide as an invisible gas. But if cold enough we can freeze it.

Dry ice

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