Question

What happens when limestone is heated strongly?

Answer 1

Heating of limestone

• Limestone is also known as calcium carbonate $\left({\mathrm{CaCO}}_3\right)$.
• When limestone is heated to a high temperature, it forms calcium oxide $\left(\mathrm{CaO}\right)$ and carbon dioxide $\left({\mathrm{CO}}_2\right)$ gas.
• This reaction is a decomposition reaction.

Balanced chemical reaction

• The reaction is as follows:

$\underset{\left(\mathrm{Calcium}\mathrm{carbonate}\right)}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}\stackrel{∆}{\to }\underset{\left(\mathrm{Calcium}\mathrm{oxide}\right)}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\left(\mathrm{Carbon}\mathrm{dioxide}\right)}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$