Question

what are physical n chemical changes

Answer 1

physical change ----it is a change in which a substance undergoes a change in its physical properties only & no new substance is formed ..it is reversible change  e.g melting of ice as it can turn in2 ice again or in water  again.....................                    CHEMICAL CHANGES ---- a change in which 1 or more new substances r formed is called chemical change        ..it is irreversible e.g buring of paper ,setting of crd                 

Answer 2

PHYSICAL CHANGE : The changes which can be reversed even after reversing the reaction is called physical changes. The chemical composition is not changed after the end of the reaction.
Example : Ice changes into water and water changing back into ice.

CHEMICAL CHANGE : The changes which cannot be reversed even after reversing the reaction is called chemical changes. The chemical composition is completely changed after the end of the reaction. There is formation of new compounds.