Describe how the ions are arranged and what type of attractive forces act between them in solid copper(II) sulfate.
Explain why solid copper(II) sulfate is a non-conductor, whereas aqueous copper(II) sulfate does conduct electricity.
State where the hydroxide ions come from.
Complete the equation for the reaction at the positive electrode: $\ldots\text{OH}^- \rightarrow \text{O}_2 + \ldots\text{H}_2\text{O} + \ldots$
Suggest why hydroxide ions, rather than sulfate ions, are discharged at the positive electrode.
Give the formulae for the four ions found in aqueous copper(II) sulfate.
Suggest why the solution turns acidic as electrolysis continues.
Suggest why the blue colour of aqueous copper(II) sulfate gradually fades during electrolysis.
Draw a ‘dot-and-cross’ diagram for an oxygen molecule. Include only the outer-shell electrons.