1. Chapter 2 Section 3 Go through this power point with your partner, taking notes and discussing the material as you progress through the paper.

2. Change of State The change a substance undergoes when it changes from one physical form to another. Some modern examples are when matter changes:

3. A liquid to… a Gas

4. Evaporation The change of a substance from a liquid to a gas. One way that evaporation takes place is through boiling: The conversion of a liquid to a vapor when the vapor pressure of a liquid equals the atmospheric pressure. This change is endothermic because energy is gained by the molecules in the substance during the change of state.

5. A liquid. A Gas to…

6. Condensation The change of state from a gas to a liquid The condensation point of a substance is the temperature at which the gas becomes a liquid! This change is exothermic because energy is removed by the molecules in the substance during the change of state.

7. A Solid. A liquid to…..

8. Freezing The change of state from a liquid to a solid The temperature at which a liquid changes into a solid is called the liquid’s freezing point. This change is exothermic because energy is removed by the molecules in the substance during the change of state.

9. A Solid to….. A liquid

10. Melting The change of state in which a solid becomes a liquid This change is endothermic because energy is gained by the molecules in the substance during the change of state.

11. A Solid to….. A Gas

12. Sublimation The Change in state from a solid directly to a gas This change is endothermic because energy is gained by the molecules in the substance during the change of state.