Bring particles, reactions and calculations into the same picture.
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| Qualification | Code | Paper structure |
|---|---|---|
| Gateway Chemistry A | J248 | Two papers at the selected tier. |
| Twenty First Century Chemistry B | J258 | Breadth and Depth papers at the selected tier. |
Both routes have two papers of 1 hour 45 minutes, with 90 marks and a 50% contribution per paper. In tuition, a reaction can be approached in three ways: describe the observation, draw a particle model and write the equation. Moving between those representations helps reveal which part your child understands and where another explanation is needed.
Equations
Check the formulae first, then balance the equation. Discuss why changing a coefficient is different from changing a formula.
Calculations
Identify the quantity required and record units at each stage. Try a second example with different values to check independence.
Practical reasoning
Explain why a test or separation method is appropriate, then connect the expected observation to the conclusion.
Send the course code, tier and a recent piece of work. Ask whether the tutor has taught that particular OCR route rather than assuming that all OCR materials are interchangeable.
Yes. A tutor can work through the mathematical skills needed for your child’s current chemistry topics, including ratios, units and substitutions, then apply them to relevant questions.
It can support understanding as the course develops. A free 15-minute introduction is a chance to discuss current topics and decide whether regular lessons or a focused sequence would be useful.
Further reading: OCR Chemistry A J248; OCR Chemistry B J258. Course information checked in September 2026. Confirm your specification and entry details with your school or college.
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