e chapter 9 changes matter part2
Post on 17-Jan-2017
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Changes matter
Melting :
It is the process of changing solid to liquid by heating.
Evaporation
It is the process of changing liquid to vapour by heating
Condensation
It is the process of changing vapour to liquid by cooling .
Freezing
It is the process of changing liquid to solid by cooling.
Sublimation
It is the process of changing solid to gas by heating.
What do u think which process will be reversible and which will be irreversible?
Reversible:
Melting.Evaporation.Condensation.Freezing.
Irreversible
Sublimation
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.
Melting point
Temperature at which substance melts. oExample : Pure water melts at 0 C.
Boiling point
Temperature at which substance boils. oExample: Pure water melts at 100 C.
Freezing point
Temperature at which substance freezes. oExample : Pure water freezes at 0 C.
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