change in states of matter

1. CHANGES OF
STATES OF
MATTER

2. Making Ice-Cream
 Keep ice-cream mixture in the fridge
 Low temperature in the fridge
 Liquid ice-cream release heat &
becomes cold
 Liquid change to solid
 Process: Freezing

3.  Dry ice has a very
low temperature:
approx. -780C
 Dry ice is carbon
dioxide in solid state
 When exposed to the
air, dry ice will
change directly to
gas
 Process: Sublimation

4.  When exposed to air, moth balls
will gradually decrease in size
 The solid balls diffuse in the air
through sublimation and change
its state from solid to gas
 Processes: Sublimation &
Diffusion

5. DISCUSS IN YOUR GROUP!
(20 minutes)

7. Snowy road can be dangerous to
vehicles if the snow is too thick
How can we melt the snow
easily?
What substance should we use?
How does it work?
What is the process involve?

8. Adding salt on the
snowy road will
decrease melting point
of the snow
The snow will melt

10. We usually see dew formed
on the plants in the morning.
How is dew formed?
What is the process?
What is the changes in the
state of matter?

14.  You are going for a picnic with your family
 You bring along a dozen of can drinks in a
container containing ice
 However, when you arrive at the beach, all
the ice already melts and your drinks are not
cold enough.
 How do you overcome this?
 How can we keep can drinks cold much
longer?
 What is the substance that we should use?
 What is the process involved?

15.  Add some salt into the ice
 Addition of salt will decrease
melting point of ice
 The ice becomes colder
 Process: Melting

17. You are drinking a cold juice
You notice that there are some
water droplets formed outside of
the glass
How the water droplets formed?
What is the changes of the states of
matter?
What is the name of the process?

18.  Outside air is warmer
 Surface of the glass is cold
 When warm air touch the cold
surface, warm air condensed
 Process: Condensation
 Gas to liquid

20.  You are using a gel air freshener at home
 The fragrance can be smelled all around your
house. Why?
 What is the process that makes the smell to
be transported to whole house?
 After a few weeks, you notice that the gel
becomes smaller. Why does it happen?
 What is the changes of the states of the gel?
 What is the name of the process?

21.  The fragrance can be smelled all around your
house because the fragrance molecules diffuse
in between air molecules.
 The smell then transported from high
concentration area to lower concentration area
 Process: Diffusion
 After a few weeks, the gel becomes smaller
because the solid gel diffuse in the air through
sublimation and change its state from solid to
gas
 Process: Sublimation

22. You are given:
 Ice-cream mixture
 2 different sizes of
Ziploc bag
 Ice
 Salt
 Discuss in your group how you can make your
ice-cream freeze without keeping it in the
fridge? Use all the materials given

24. 1. Put ice-cream mixture in
smaller ziploc bag
2. Put ice into bigger ziploc
bag. Add in salt

25. 3. Put ice-cream bag inside
the bigger bag containing ice.
Wait 15-20 minutes
How does it work?
 Salt reduce melting
point of ice
 Ice becomes cooler
 Much colder ice
makes ice-cream
mixture freeze easier
and faster
 Process: Freezing
(ice-cream)