Give the half-equation for the reaction at the anode, during the electrolysis of molten calcium oxide. 

Give the two half-equations for the electrolysis of a concentrated solution of hydrochloric acid, $\mathrm{HCI}$. 

Give the two half-equations for the electrolysis of a dilute solution of sodium nitrate, ${\mathrm{NaNO}}_3$. 

Give the two half-equations for the electrolysis of a dilute solution of copper$\left(\mathrm{II}\right)$ chloride, ${\mathrm{CuCl}}_2$.  

All three products from the electrolysis of brine must be transported with care. Why? 

Draw a rough sketch of the diaphragm cell. Mark in where the oxidation and reduction reactions take place in it and write the half-equations for them.