1. Bell Ringer 9-14-09 What are the 4 states of matter?
How do the particles of solids move?
Name the 2 types of solids.
What is an example of each?
Name the 2 properties of liquids.

2. Chapter 3 Section 2 Changes of State

3. Demonstration
HowStuffWorks Videos "States of Matter: Energy and the Four States of Matter"

4. Changes between Solid and Liquid
Melting- solid  liquid
At its melting point, particles of a solid substance are vibrating so fast that they break free from their fixed positions.
Melting point of pure water = 0oC
Increase in thermal energy
Freezing- liquid  solid
At its freezing point, the particles of a liquid are moving so slowly that they begin to form regular patterns
Freezing point of pure water = 0oC
Decrease in thermal energy

5. Changes between Liquid and Gas
Vaporization- liquid  gas
Increase in thermal energy
Evaporation- vaporization on the surface
Ex: disappearing puddle of water
Boiling- vaporization below and at the surface
Ex: when liquid bubbles
Boiling point- temperature at which liquid boils
Boiling point changes with Air Pressure
Condensation- gas  liquid
Ex: breathing onto a mirror, formation of clouds
Decrease in thermal energy

6. Changes between Solid and Gas
Sublimation- solid  gas
Ex: dry ice (solid carbon dioxide)

7. Changes in States of Matter
Solid
Liquid
Gas
Interpreting changes of state