What is the differences between chemical Change and physical change?

Dear student, The process by which two different substance react and give a new product that cannot be reversible is called CHEMICAL CHANGE. It is permanent in nature. EXAMPLE :- Rusting of Iron. When iron is rusted u cannot get back the good iron. Churning of milk. When you churn a milk, you get curd as a new substance and you cannot get back the milk. The process by which two different substance react and does not form any new substance and it is reversible in nature is called PHYSICAL CHANGE. It is temporary in nature. EXAMPLE :- Melting of ice. When ice is melted it gives you water and when it is again cooled you can get the ice cube back. Melting of candle. When candle is melt it becomes wax and when you heat the wax you can get the candle shaped as your wish. Regards .