Physical changes involve changes in the physical properties of matter without changing its chemical composition, such as changes of state from solid to liquid to gas, or cutting and tearing. Chemical changes involve the rearrangement of the molecular or atomic structure of a substance and the formation of one or more new substances with different properties, such as burning fuel or baking a cake. Examples of physical changes include melting, freezing, boiling, and shredding paper while examples of chemical changes include burning, rusting, and cooking.