Saturday 9 March 2013

Basics of Chemistry-Physical and Chemical changes

Physical Change
Physical changes are changes that do not produce new substances.Most of the physical changes are reversible.However,some physical changes like tearing of paper are not reversible.Other examples of Physical changes are mixing salt with water,freezing of water,breaking of glass.




Chemical Change
In a chemical change,a new substance is formed.Chemical changes are irreversible.Some examples of Chemical changes are growing up,cooking of food,burning of a substance,etc.
  

 

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