define physical & chemical change
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physical change is reversible and chemical change is not reversible
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Physical change= The changes in which no new substances are formed are called physical change. These changes may be reversible.
Example=melting of ice cream, breaking of glass , freezing of water etc.
Chemical change= The changes in which new substances are formed with different properties. These changes may not be reversible.
Example= cooking of food , burning of substances , burning of candle etc.
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