![]() ![]() However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. What is the difference between physical change and chemical change? But when you speed up the process by using a reactant, such as salt, it becomes a chemical reaction. The melting of ice is a physical change when it occurs naturally. The wax molecules are undergoing a chemical change they are changing into different molecules by reacting with a substance in the air. The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change.
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