Question

Answer the following questions in short:
1. State whether rusting of iron is a physical or a chemical change? How can you prevent
rusting of iron?​

Answer 1

Answer:

Rusting is an example of a chemical change.

Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.