5.3 Write ionic half-equations for the reactions at the electrodes in aluminium extraction

These are the two equations you need to know (all thanks go to Hannah Help)

Al³⁺ + 3e^- > Al

• 2O^2- → O₂ + 4e^-

(btw, the Al and the O2 come from the aluminium oxide which is broken down via electrolysis)