Rusting of an article made up of iron is called
Rusting of an article made up of iron is called corrosion and it is a chemical change.
Corrosion is a chemical change because in such a change chemical properties or composition of the original substance changes resulting in the formation of at least one new substance. Formation of rust is a chemical change as a new compound called hydrated iron oxide (Fe203. H2O) is formed which is totally different from element iron (Fe). Chemical changes are irreversible.
The chemical reaction showing rusting of iron is shown below.
Other examples of chemical change are burning of paper and burning of magnesium wire.
In physical changes, no new substances are formed. In such a change, chemical properties and composition of the original substance do not change. Physical changes are reversible. Examples of physical changes are melting of ice, boiling of water and breaking of a glass tumbler.