(a(i))[2]
Explain, with reference to the equation, why this is a redox reaction.
(a(ii))[1]
Construct the ionic equation for the reaction shown.
(b)[3]
Pure copper can be obtained by electrolysing aqueous copper(II) sulfate with one pure copper electrode and one impure copper electrode. Draw a labelled diagram of this electrolysis.
(c)[2]
What observations are made when aqueous ammonia is added to a solution containing copper(II) ions, with stirring, until no further change is seen?
(d)[2]
Blocks of magnesium are fixed to underground iron pipes to prevent rusting. Explain how the magnesium prevents the pipes from rusting.