Which of the following is an example of a chemical reaction?

Iron rusting is an example of a chemical reaction because it involves a chemical change. When iron reacts with oxygen and moisture in the air, it forms iron oxide, commonly known as rust. This process alters the chemical composition of iron, resulting in a new substance with different properties. Unlike physical changes such as melting or dissolving, chemical reactions involve the breaking and forming of chemical bonds, resulting in the creation of new substances.