Name the ore of aluminium that is mainly made up of aluminium oxide.
Give two reasons why electrolysis is carried out with a molten mixture of aluminium oxide and cryolite rather than with molten aluminium oxide alone.
Write the ionic half-equations for the reactions at the electrodes.
The anodes are made from carbon and need to be replaced at regular intervals. Explain why the carbon anodes need to be replaced regularly.
Magnesium placed in aqueous copper(II) sulfate causes an immediate displacement reaction. Write an ionic equation for this reaction. Include state symbols.
State two observations you would see when magnesium is added to aqueous copper(II) sulfate.
When aluminium foil is added to aqueous copper(II) sulfate no immediate reaction takes place. Explain why.
Aluminium powder reacts with iron(III) oxide to produce aluminium oxide and iron. Write a chemical equation for this reaction.