Question

How do you know that rusting of iron is a change?

Answer 1

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.

Answer 2

Dear Student,

◆ Rusting of iron is a change because -

• During rusting of iron, colour of iron is changed. This indicates that the change is occurring.
• The brownish colour is due to formation of layer of iron oxide over the iron metal.
• As chemical composition of substance is changed here, it is termed chemical change.

Thanks dear. Hope this helps you...