Because you can not reverse this and make the fruit not be rotten in chemical change the chemical in the object are changed to form new elements and substance therefore it can not be reversed.
In physical change the chemicals and atoms/molecules are just re-arranged in position and they can be reversed.
Physical Change- reversible
Chemical change- irreversible
In physical change the chemicals and atoms/molecules are just re-arranged in position and they can be reversed.
Physical Change- reversible
Chemical change- irreversible