Question

Classify the following reaction as a combination, displacement, decomposition, or neutralization reaction.

${\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2$

Answer 1

${\mathrm{CaCO}}_3\left(\mathrm{S}\right)\to \mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• The given reaction is a decomposition reaction.
• Decomposition reaction - A reaction in which a single compound breaks down into two or more simpler substances is known as a decomposition reaction.
• In the given reaction calcium carbonate is$\left({\mathrm{CaCO}}_3\right)$is decomposed on heating into calcium oxide$\left(\mathrm{CaO}\right)$ and carbon dioxide$\left({\mathrm{CO}}_2\right)$.

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