phase changes types

1. Phase Changes and the Particle
Theory of Matter

2. Let’s Play!
GUESS ME!

3. INSTRUCTION:
Classify each objects if it is either
solid, liquid or gas. You’ll only have
2 minutes to answer it in a ¼ sheet
of paper.

9. Activity:
What changes takes place?

10. INSTRUCTION:
The activity will be answered in a
manila paper and to be post on the
board. You’ll only have 5 minutes
to answer it.

11. Materials Needed:
Candle
Lighter/Match

12. Procedure:
1.Prepare the candle and the
match.
2.Light up the candle.
3.Observe what happen to the
candle.

13. Questions:
Q1. What is your observation about the
candle before it is lighted?
Q2. What is your observation about the
candle during the time it was lit?
Q3. What is your observation after
putting out the flame of the candle?

14. Q4. What state of matter is the
lighted candle when it melts?
Q5. What do you think is the
process that takes place when solid
state changes to a liquid state?

15. LEARNING OBJECTIVES

16. What is a Phase Change?
• Is a change from one state of matter
(solid, liquid, gas) to another.
• Phase changes are physical changes because:
- It only affects physical appearance, not
chemical make-up.
- Reversible

17. 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.

18. Types of Phase Changes

19. Melting
• Phase change from a
solid to a liquid.
• Molecules speed up,
move farther apart,
and absorb heat
energy.
• Example: Melting of
ice

21. Freezing
• Phase Change from a
liquid to a solid.
• Molecule slow down,
move closer
together and release
heat energy.
• Example: Water
turning into ice.

23. Boiling
• Phase change from a
liquid to gas. It
occurs at the boiling
point of matter.
• Molecules speed up,
move farther apart,
and absorb heat
energy.
• Example: Boiling
water

25. 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.
• Example: Drying
Clothes under The Sun

27. Condensation
• Phase change from a
gas to a liquid.
• Molecule slow down,
move closer
together and release
heat energy.
• Example: Water
droplets on the
outside of your cold
drink.

29. Sublimation
• Phase change from a
solid to a gas.
• Molecules speed up,
move farther apart,
and absorb heat
energy.
• Example: Dry ice

31. Deposition
• Phase change from a
gas to solid.
• Molecules slow
down and move
closer together.
• Example: Frost

33. Melting & Boiling Points
• Melting Point: The temperature at which
a solid changes into a liquid.
• Boiling Point: The temperature at which
a liquid changes into a gas.
• Freezing point: the temperature at which
a liquid turns into a solid when cooled.

34. Questions:
1. What do you think will happen if
there is no Phase Changes?
2. Are the Phase Changes
important in our everyday life?
Explain.

35. Directions:
A. Multiple choice. Choose the corresponding
letter of the correct answer.
1. It is a phase change from a solid to
liquid.
A. Freezing
B. Sublimation
C. Melting
D. Condensation

36. 2.It is a phase change from a liquid
to solid.
A. Melting
B.Sublimation
C.Evaporation
D. Freezing.

37. 3.It is a phase change from a liquid
to gas.
A. Deposition
B.Boiling
C.Condensation
D. Melting

38. 4.It is a phase change from a gas to
liquid.
A. Condensation
B.Evaporation
C.Deposition
D. Boiling

39. 5.It is a phase change from a solid
to gas.
A. Deposition
B.Sublimation
C.Freezing
D. Melting

40. B.Illustrate the phase changes
below:

41. Assignment:
Directions: Research the following
questions:
1.What is Physical Change?
2.What is Chemical Change?