Question

Rusting of iron is a ____________change.

Answer 1

Chemical change: A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction.

Examples of chemical changes- Rusting iron, Burning of Magnesium ribbon.

Rusting of iron:

• In this change, Iron reacts with Water and Air and produces new substance Rust.
• Hence rusting of iron is an example of chemical change.
• The chemical equation for rusting of Iron is
• $$\begin{gathered} 4\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right)+{\mathrm{xH}}_2\mathrm{O}\left(\mathrm{aq}\right)\to 2{\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{xH}}_2\mathrm{O}\left(\mathrm{s}\right) \\ \mathrm{Iron}\mathrm{Oxygen}\mathrm{Water}\mathrm{Rust} \end{gathered}$$

Therefore, rusting of iron is a chemical change.