1. Changes in State

2. Solid to a Liquid Melting. Melting Point.
Where a solid changes to a liquid.
Particles must gain energy and become free to move around.
Melting Point.
The temperature at which melting occurs.

3. Liquid to a Gas Vaporization: Two types: Boiling Point.
Where a liquid changes to a gas.
Particles gain more energy and separate from each other.
Two types:
Boiling
Happens at the boiling point
Happens throughout the liquid.
Evaporation.
Below the boiling point.
Only occurs at the surface of the liquid.
Boiling Point.
The temperature at which a liquid boils.
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4. Label the type of vaporization.

5. Melting and Vaporization Video

6. Gas to a Liquid Condensation Where a gas becomes a liquid.
The reverse of vaporization
Occurs when a gas loses enough energy to form a liquid.
Particles slow down and come back together.

7. Liquid to a Solid Freezing. Freezing Point.
Where a liquid changes to a solid.
Particles must lose enough energy that they no longer move around freely.
Freezing Point.
The temperature at which freezing occurs.

9. Sublimation
Where a Solid changes to a Gas, or and Gas changes to a Solid.
The change either way skips the liquid state.
Examples:
Dry ice.
Formation of snow.

10. Condensation, Freezing, & Sublimation