change of matter

1. Changes matter

2. Melting :
 It is the process of changing solid to liquid
by heating.

3. Evaporation
 It is the process of changing liquid to
vapour by heating

4. Condensation
 It is the process of changing vapour to
liquid by cooling .

5. Freezing
 It is the process of changing liquid to solid
by cooling.

6. Sublimation
 It is the process of changing solid to gas
by heating.

7. What do u think which process
will be reversible and which will
be irreversible?

8. Reversible:
 Melting.
 Evaporation.
 Condensation.
 Freezing.

9. Irreversible
 Sublimation

10. What do u think this change in
state called?
 Physical change :Why?
-Change in the form of an object without
changing what type of matter it is.
-Change in the shape.

11. Melting point
 Temperature at which substance melts.
o
 Example : Pure water melts at 0 C.

12. Boiling point
 Temperature at which substance boils.
o
 Example: Pure water melts at 100 C.

13. Freezing point
 Temperature at which substance freezes.
o
 Example : Pure water freezes at 0 C.