Is Rust a Physical or Chemical Change

Rusting is not a physical change, it is a chemical change. Because rust is produced when iron responds with the oxygen in the atmosphere, therefore producing iron oxide which we know as rust. Additionally it is chemically proven that rust has a various chemical structure to iron and when this occurs it is regarded as chemical change.


Rust is a broad term for a number of iron oxides, generally red oxides, created by the reaction of iron with oxygen in the existence of water or air moisture. Rust contains iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3, hydrated iron(III) oxides Fe2O3·nH2O. So, rusting is without a doubt a chemical process.

The development of rust symbolizes a chemical change. Whenever a chemical change takes place, the substance or substances present at the starting are no more present at the finish of the change. Once a chemical change takes place, it theoretically cannot be undone.

On the other hand, when a physical change takes place, the material that is the subject of the physical change is unchanged. A physical change theoretically is capable of getting undone.