This document discusses the three phases of matter - solid, liquid, and gas - and the phase changes that occur between them. It explains that phase changes require the absorption or release of heat energy as molecules speed up or slow down and move farther apart or closer together. The document then defines and provides examples of different types of phase changes: melting (solid to liquid), freezing (liquid to solid), evaporation (liquid to gas), condensation (gas to liquid), sublimation (solid to gas), and deposition (gas to solid).

1. PHASE CHANGES IN
MATTER

2. REVIEW: 3 PHASES OF MATTER
• SOLID
• LIQUID
• GAS

3. WHAT HAPPENS DURING A
PHASE CHANGE?
• DURING A PHASE
CHANGE, HEAT ENERGY
IS EITHER ABSORBED OR
RELEASED.
• HEAT ENERGY IS
RELEASED AS
MOLECULES SLOW
DOWN AND MOVE
CLOSER TOGETHER.
• HEAT ENERGY IS
ABSORBED AS
MOLECULES SPEED UP
AND EXPAND.

4. TYPES OF PHASE
CHANGES

5. MELTING
• PHASE CHANGE FROM
A SOLID TO A LIQUID
• MOLECULES SPEED UP,
MOVE FARTHER
APART, AND ABSORB
HEAT ENERGY

6. FREEZING
• PHASE CHANGE FROM A
LIQUID TO A SOLID
• MOLECULE SLOW
DOWN, MOVE CLOSER
TOGETHER AND
RELEASE HEAT ENERGY.

7. EVAPORATION
• PHASE CHANGE FROM
A LIQUID TO A GAS ON
THE SURFACE OF A
LIQUID (OCCURS AT
ALL TEMPERATURES).
• MOLECULES SPEED UP,
MOVE FARTHER APART,
AND ABSORB HEAT
ENERGY.

8. CONDENSATION
• PHASE CHANGE FROM A
GAS TO A LIQUID.
• MOLECULE SLOW DOWN,
MOVE CLOSER TOGETHER
AND RELEASE HEAT
ENERGY.

9. SUBLIMATION
• PHASE CHANGE FROM
A SOLID TO A GAS.
• MOLECULES SPEED UP,
MOVE FARTHER APART,
AND ABSORB HEAT
ENERGY.
Mothball
s
Albatross

10. DEPOSITION
• PHASE CHANGE FROM A
GAS TO A SOLID.
• MOLECULES SLOW
DOWN, MOVE CLOSER
TOGETHER AND RELEASE
HEAT ENERGY.

12. DIRECTION: WRITE MELTING, FREEZING,
EVAPORATION, CONDENSATION, SUBLIMATION
AND DEPOSITION
1.Liquid to solid
2.Gas to a liquid
3.Solid to a gas
4.Gas to solid
5.Liquid to gas
6.Solid to a liquid
7.
8.
9.
10
.

13. DIRECTION: IDENTIFY WHICH PROCESS IN EACH
SITUATION. WRITE MELTING, FREEZING, EVAPORATION,
CONDENSATION, SUBLIMATION AND DEPOSITION
• 1. The dry ice used in horror
films.
• 2. The wet sidewalk outside
dried up by the afternoon.
• 3. The candle became so much
shorter after being lit for 4 hours
• 4. The meat taken straight from
the freezer was left in a basin
so it could thaw.
• 5. Snow fell in the ground at
winter
• 6. The last step in making
mango float is to let the cream
harden.
• 7. Matty’s eyeglasses fogged up
after leaving an air-conditioned
room.
• 8. Eric spray perfume on his
clothes
• 9. Butter place in the
refrigerator.
• 10. Liza saw fog on the grass
every morning.

14. CHANGES IN MATTER