AQA · OCR A · Year 13
Electrode potential questions
Calculate E°cell, decide which half-equation runs forwards, identify oxidising and reducing agents, and combine half-equations precisely.
E°cellreaction directionoverall equationsexam-safe wording
Fresh question
Decide the chemistry before the arithmetic
0first-time correct0completed
One rule throughout
The more positive E° couple runs as the reduction. Reverse the other half-equation for oxidation, balance electrons, add the equations, then calculate the potential difference. The worked answer also shows the wording an examiner can mark unambiguously.