Question

Complete and balance the following equation and also state the type of reaction that is taking place:

$\mathrm{CaO}+{\mathrm{H}}_2\mathrm{O}\stackrel{}{\to }$

Answer 1

Combination reaction:

• Combination is a chemical reaction in which two simpler reactants combine to form a single product.
• Such reactions can be brought by the action of heat, light, pressure, electricity, etc.
• A general combination reaction is represented as
• $\mathrm{A}+\mathrm{B}\stackrel{}{\to }\mathrm{AB}$
• For example when calcium oxide$\left(\mathrm{CaO}\right)$ reacts with water resulting in the formation of calcium hydroxide$\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$ or quick lime and releasing a tremendous amount of energy.
• $\underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\stackrel{}{\to }\underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)}$