Is putting butter on bread a physical change?

* No new substance is formed: The butter and bread remain the same chemically. They simply combine physically.

* Change is reversible: You can easily remove the butter from the bread, returning it to its original state.

In contrast, a chemical change would involve a change in the chemical composition of the substances involved. For example, baking bread involves chemical changes as the heat alters the structure of the flour and other ingredients.