Describe the process of refining copper. 

Draw a circuit to show how you would test whether mercury conducts. 

Naphthalene is a molecular substance. Do you think it will conduct electricity when molten? Explain. 

What does the electrolysis of this molten compound give? 

Sodium chloride, $\mathrm{NaCl}$.

Name the products at each electrode, when this aqueous solution is electrolysed using an inert electrode: 

a dilute solution of copper$\left(\mathrm{II}\right)$ sulphate, ${\mathrm{CuSO}}_4$. 

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

Steel cutlery is often electroplated with nickel. Why?