1. Aim: How is energy related to a phase change? Do Now: 1.Take out your calculator and reference tables. 2.What is the difference between temperature and heat?

2. What do the molecules of a solid, liquid and a gas look like? SOLIDLIQUIDGAS

3. How does the addition of heat affect… SOLIDLIQUIDGAS

4. What happens if heat is removed from… SOLIDLIQUIDGAS

5. ***Remember*** Solid Liquid Gas Endothermic – energy is absorbed (added). Gas Liquid Solid Exothermic – energy is released (removed).

6. How can we illustrate what happens to the temperature of each phase as energy is added or lost? We can draw what’s called a phase change diagram. This is a diagram (graph) that shows what happens to the kinetic energy (temperature) of a substance as heat is added over time. Sometimes we call a phase change diagram a heating or cooling curve.

7. Parts of a Heating Curve

8. Parts of a Cooling Curve

9. Activity/Homework #