Question

Why is the rusting of an iron pole not a physical change?

Answer 1

Simply it is not reversible . chemical changes are irrevrsible .

Answer 2

The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide. Rusting would only be a physical change if iron molecules remained pure iron throughout the process.