1. Warm-Up 9/25/13
Sketch what molecules look like in the following situations. Include arrows to show relative motion.
Solid, 20°C
Liquid, 50°C
Liquid, 90°C
Gas, 120°C

2. Phase Changes
Wednesday, 9/25/13

3. Changing State Requires Energy!
Changes of state occur with a change in temperature or pressure
Particles of a substance overcome (or succumb to) intermolecular attraction

4. MUCH motion/vibration =
MUCH Kinetic Energy =
MUCH associated heat E
More motion/vibration =
More Kinetic Energy =
More associated heat E
Little motion/vibration =
Little Kinetic Energy =
Little associated heat E

5. Melting Solid state to liquid state
Solid particles gain energy and are able to break apart from one another
Energy Required: “Heat of Fusion”
Opposite: Freezing

6. Evaporating Liquid state to gas state
Liquid particles gain enough energy to escape into the vapor state
Energy Required: “Heat of Vaporization”
Opposite: Condensing

7. Boiling will happen when the downward atmospheric pressure is equal to (or less than) the upward vapor pressure from the liquid

8. Sublimation Solid state to gas state
Requires rapid change in temperature or pressure
Opposite: Deposition

9. Your Job
Complete questions 1 and 2 in the States of Matter and Phase Changes packet…DUE TOMORROW.
Matter Project revisions due Monday
QUIZ Monday on Physical/Chemical Change and Phase Changes