1. Melting Solid  Liquid Energy is added, particles speed up (endothermic) Melting Point: Temp. at which a substance melts Freezing Liquid  Solid Energy is removed, particles slow down (exothermic) Freezing point: temp at which a substance freezes Boiling Liquid  Gas Throughout a liquid Boiling Point: Temp at which a liquid boils Endothermic

2. Evaporation Liquid  Gas Only at surface Endothermic Condensation Gas  Liquid Exothermic Ex: Water droplets on glass Sublimation Solid  Gas Endothermic *Dry Ice*

3. Melting Solid  Liquid Energy is added, particles speed up (endothermic) Melting Point: Temp. at which a substance melts Freezing Liquid  Solid Energy is removed, particles slow down (exothermic) Freezing point: temp at which a substance freezes Boiling Liquid  Gas Throughout a liquid Boiling Point: Temp at which a liquid boils Endothermic

4. Evaporation Liquid  Gas Only at surface Endothermic Condensation Gas  Liquid Exothermic Ex: Water droplets on glass Sublimation Solid  Gas Endothermic *Dry Ice*