Question

Rusting of iron is a chemical change since a ____________ formed.

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 are burning of any substance, and rusting of Iron.

• Rusting is a part of corrosion and is a chemical process that results in the formation of red or orange coating on the surface of metals.
• The presence of Oxygen and water vapour in the air are two necessary conditions for rusting of Iron.

The equation for this reaction is:

$\underset{\mathrm{Iron}}{4\mathrm{Fe}}+\underset{\mathrm{Air}}{3{\mathrm{O}}_2}+\underset{\mathrm{Moisture}}{{\mathrm{xH}}_2\mathrm{O}}\to \underset{\mathrm{Rust}}{2{\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{xH}}_2\mathrm{O}}$

Thus, rusting of Iron is a chemical change since a new substance is formed.