Question

How can we justify that rusting of iron is a chemical 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

As grey iron gets converted to rust coloured oxide, it is a chemical change.

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Chemical changes are accompanied by following changes:

a) formation of precipitate

b) release or absorption of energy

c) formation of gas

d) change in color

Example: Rusting of iron

$Fe +O_2+xH_2O\righatarrow Fe_2O_3.xH_2O$

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