Overview
For Cambridge which Cambridge A-Level subjects, edexcel International A Level Chemistry uses the same analytic mark types as other IAL STEM units: M for method/working, A for accuracy, B for independent correct statements, plus follow-through when the method is valid. This guide is for students who sit WCH units — not Cambridge 9701 by default.
Quick answer
This section covers Quick answer — ranked by what Cambridge examiners return to most often in past papers.
| Question | Answer |
|---|---|
| Which board picker? | /mark?board=edexcel |
| Units live | WCH11–WCH16 on the Chemistry hub |
| What to watch | Working, units, significant figures, dependent accuracy |
| UMS | Same cash-in idea as Maths — see UMS guide |
How to mark a Chemistry answer
This section covers How to mark a Chemistry answer — ranked by what Cambridge examiners return to most often in past papers.
- Self-mark the Pearson scheme first — note every M/A line you missed.
- Photograph or type the worst question into MarkScheme with the matching unit (start with WCH11).
- Rebuild one skill (titration calculation, organic mechanism step, equilibrium expression) before the next paper.
- Do not paste Cambridge mark schemes into an Edexcel sitting and expect the same mark pattern.
Common traps
This section covers Common traps — ranked by what Cambridge examiners return to most often in past papers.
| Trap | Fix |
|---|---|
| Correct idea, missing working | Write the step that earns the M mark |
| Right number, wrong SF/units | Match the question’s required form |
| Early arithmetic error carried forward | Apply FT only when method is valid; otherwise restart |
Related
This section covers Related — ranked by what Cambridge examiners return to most often in past papers.