Identify the molecule that undergoes oxidation and state the half-equation for the process.

Identify the molecule that undergoes reduction and state the half-equation for the process.

glucose/${{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}}$;

${{\text{C}}_6}{{\text{H}}_{12}}{{\text{O}}_6} + {\text{6}}{{\text{H}}_2}{\text{O}} \to {\text{6C}}{{\text{O}}_2} + {\text{24}}{{\text{H}}^ + } + {\text{24}}{{\text{e}}^ - }$;

oxygen/${{\text{O}}_{\text{2}}}$;

${\text{6}}{{\text{O}}_2} + {\text{24}}{{\text{H}}^ + } + {\text{24}}{{\text{e}}^ - } \to {\text{12}}{{\text{H}}_2}{\text{O}}$;

Accept equation divided by 6.

Award [2 max] if (a) and (b) are reversed and all 4 marking points are correct.

Majority of candidates identified that glucose was oxidised and oxygen was reduced.

It was very rare to see correct half-equations.