Write an activity to show the electrolysis of water, as an example of decomposition reaction.

Classify the following reaction:

$\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \mathrm{Ca}\left(\mathrm{OH}{)}_2\right(\mathrm{aq})$

Classify the following reaction :

$\mathrm{Fe}\left(\mathrm{s}\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$

Name the substance oxidised, reduced, oxidising agent and reducing agent in the following reaction:

$\mathrm{Ca}+{\mathrm{Cl}}_2\to {\mathrm{CaCl}}_2$