Since rusting is a chemical change, the chain changed its composition as a result of oxidation of iron to hydrated iron(iii) oxide
What are chemical changes?
Chemical changes are changes which occur as a result of chemical reactions which occur in substances resulting in the production of new substances.
An example of a chemical change is rusting of iron.
Rusting of iron occurs as a result of the oxidation of iron when exposed to air and water.
The picture shows rusting of iron.
Therefore, the chain changed its composition as a result of oxidation of iron to hydrated iron(iii) oxide.
Learn more about rusting at: https://brainly.com/question/688285
