1. Changes of State California Science Standard 8.3.D.E 8.5.D.
Purpose: Introduce changes in the state of matter.

2. Change in State
A change in state is the conversion of a substance from one state to another.
Example: ice water vapor
melting vaporization
ice water vapor
freezing condensation

4. Melting: Solids to Liquids
Melting is the change in state from solid to liquid
It is a characteristic property of a substance
Example: water melts/freezes at 0 C
Melting is an endothermic change,
heat is taken in, absorbed to cause it

5. Freezing: Liquids to Solids
Freezing is the change of state from liquid to solid
This is an exothermic change because energy is being removed from the liquid

6. Vaporization: Liquid to Gas
Vaporization is the change in state from liquid to gas
This occurs at the boiling point for that substance
This is also a characteristic property of a substance, just like the freezing point

7. Condensation: Vapor to Liquid
Condensation is the change in state from vapor to liquid

8. Sublimation: Solids to Gas
Sublimation is the change in state from solid directly to gas
Example: dry ice

9. Endothermic vs. Exothermic
Example: ice water vapor
melting vaporization
endothermic
ice water vapor
freezing condensation
exothermic