1. Topic: Phases of Matter Do Now: ANSWER: Which pair defines…. 1. SOLID
Topic: Phases of Matter Do Now: ANSWER: Which pair defines… SOLID 2. LIQUID 3. GAS A> Definite Volume, Indefinite Shape B> Definite Volume, Definite Shape C > Indefinite Volume, Indefinite Shape

2. PHASE CHANGES – occur when the energy of the particles is changed
Remove energy – Exothermic
(energy exits)
Add energy – Endothermic
(energy IN)

3. (Boiling)
(Solidification)

4. l exo s endo l endo g exo s endo g exo 1. solidification ___→ s
Phase Endo or Exo
1. solidification ___→ s
2. melting ___→ l
3. vaporization ___→ g
4. condensation ___→ l
5. sublimation ___→ g
6. deposition ___→ s l
exo s
endo l
endo g
exo s
endo g
exo

6. When a substance goes from the gas to a condensed phase (s or l), what happens?
The particles get closer together and their motion slows down

7. When a substance goes from a solid to a liquid or a gas, what happens?
The particles move farther apart and their motion increases