changes of state

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Last updated 2:38 PM on 5/24/26
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11 Terms

1
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solid to liquid

melting

2
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liquid to gas

evaporation

3
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liquid to solid

freezing

4
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gas to liquid

condensation

5
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solid to gas

sublimation

6
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When heating (melting, evaporating, sublimation):

  • Particles gain kinetic energy

  • Move faster

  • Overcome forces of attraction

  • Move further apart

7
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When cooling (freezing, condensing):

  • Particles lose kinetic energy

  • Move more slowly

  • Forces of attraction pull particles closer

  • Become fixed (solid)

8
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When a substance is melting or boiling, the temperature stays constant even though heat is still being supplied.

Why?

All the energy goes into breaking forces of attraction, not raising temperature.

9
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Flat sections

state change

10
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Sloped sections

temperature increasing or decreasing

11
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why is it flat

Flat because energy is used to break or form forces of attraction