change in states of matter

1. CHANGES IN
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

6. 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 involved?

7. As salt has low freezing point
than ice, it reduces the snow
from becoming snow/ice
crystals again sooner, hence
adding salt on snowy road
will melt the snow.
The salt will first will
dissolve on the top
surface of the ice/snow
and eventually the salt
water will melt the
snow from all sides .

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

13.  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?

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

16. 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 change of the state of
matter?
What is the name of the process?

17.  Outside air is warmer
 Surface of the glass is cold due to
the cold drink inside it.
 When warm air touches the cold
surface, warm air gets condensed
 So we can see water droplets on
the surface of the glass.
 Process: Condensation
 Gas to liquid

19.  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 state of the gel?
 What is the name of the process?

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

22. PICTURE ERROR - PLEASE NOTE - Option b is DEPOSITION