change of state material for grade 7

1. Change of State
Perubahan Wujud Zat

2. Today’s lesson objective
• In the end of the lesson you will be able to:
– Describe the particles of matters when their state
is change.

3. WATER

4. Change of state
A B
C
D
Water, ice and water vapor have the same matter.
The state of matter have changed

5. Change of state
Melting Evaporation
condensation
Freezing

6. Big changes in temperature can have a big effect
on the state of matter
Change of state
Melting Evaporation
condensation
Freezing

7. Big changes in temperature can have a big effect
on the state of matter
Change of state
Temperature
increase
Temperature
increase
Temperature
decrease
Temperature
decrease

8. Melting
• Melting is the change of state
in which a solid become liquid
by adding heat.
• The particle of the solid move
faster when they are heated.
• It makes the particles move
away from each other

9. Evaporation
• Evaporation is the change of
state from a liquid to a gas
• It occurs when the particles
in a liquid escape to form a
vapour.
• When the temperature
become hotter, the
movement of the particles
become faster.

10. Condensation
• Condensation is the
change of state from a
gas to a liquid
• The particles of liquid
move slower in lower
temperature
• It makes the particles
get closer to each other

11. Freezing
• Freezing is the change
of state from a liquid
to gas
• Lower temperature
makes the movement
of the particles slower
• It makes the particles
stick to each other

12. What is the difference

13. Boiling
• When the liquid reaches a set temperature it
will change from liquid to gas in the body of
the liquid, creating bubbles and boiling

14. Evaporation
• evaporation takes place at a liquid’s surface and occurs
over a wider temperature range as the surface
particles get more energy from the surroundings

15. A cloud is a mass of water drops or ice crystals
suspended in the atmosphere. Clouds form
when water condenses in the sky. The
condensation lets us see the water vapor