Saturday, June 30, 2012

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Physical and Chemical Change and their types

Physical Change
If physical property of a substance changes it  is called physical change where no new substance is formed. Such change is reversible nature.Eg:- melting of wax,freezing of ice.  

Chemical  Change
If chemical property of a substance changes it  is called chemical change where  new substance is formed. Such change is reversible nature.Eg:- curding milk, burning of paper and wood. 


Difference between physical and chemical change


Physical Change
Chemical Change
It is a temporary change
It is a permanent change.
The chemical composition of a substance remains the same.
The chemical composition of a substance is change.
No new substance is formed
New substance is formed
It can be reverse
It can be reverse
Only the physical properties like color ,test  or state is changed in it
Chemical as well as physical properties are changed in it
Change in energy is usually not seen.
Usually energy is observed in it.
Eg:- magnetization of iron piece
Eg:- burning magnesium ribbon

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