2. Phase Changes Melting Vaporization Condensation Freezing Sublimation

3. Melting Solid  Liquid Add heat energy Example Ice melting Ice melts at… 0 o C Melting point

4. Vaporization Liquid  Gas Add heat energy Water boiling Water boils at… 100 o C Boiling point Evaporation Vaporization at the surface of a liquid

5. Condensation Gas  Liquid Take away heat energy Water droplets on the outside of a glass Water vapor condenses at… 100 o C

6. Freezing Liquid  Solid Take away heat energy Water becoming ice Water freezes at… 0 o C Freezing point

7. Sublimation Solid  Gas Add heat energy Dry Ice becoming CO 2 (Carbon Dioxide) -79.5 o C -109.3 o F

8. Energy Phase changes ALWAYS require adding or removing energy. Temperature does NOT change during a phase change. Phase changes are examples of Physical changes