1. Heating and Cooling Curves
Goal: the goal of this video is to be able to describe the three phases of matter and phase changes through a heating/cooling curve

2. What are some things that happen as we heat a sample up?
Solid  Liquid  Gas
Melting, boiling

3. What is the heating curve?
The heating curve is a graph which represents how a sample changes phases. As heat is added over time, the sample changes temperature and phase accordingly. Thus heating curve.
Temperature °C
HEAT 

4. Changes of state – heating curve
gas
boiling
liquid  gas
temperature
liquid
melting
solid  liquid
solid
time

5. Changes of state – cooling curve
temperature
time
gas
condensing
gas liquid
liquid
freezing
liquid  solid
solid

6. Evaporation vs. Boiling
Boiling is a phase change of a WHOLE substance from liquid to gas
Evaporation is a molecule on the surface escaping mainly during the liquid phase

7. The heating and cooling curves are show changes in temperature and energy. They give us detailed information about phases and phase changes of samples.
NOW YOU KNOW…