OCR A-Level Chemistry answers, written to the spec
3 topics · specification H432 · explanations and examiner marking in OCR’s own language
Studying OCR A-Level Chemistry? Pick your board once and every answer, mark and flashcard elid gives you follows that specification. Free to start, no card needed. Open elid →
This is the full OCR A-Level Chemistry specification, code H432, as elid holds it — 3 topics, each with the terminology OCR marks against. Every explanation and every mark elid gives you is written against this list, not a generic A-level one, because the same question answered in AQA, CAIE or Edexcel language loses marks it should have earned.
The OCR A-Level Chemistry specification, topic by topic
Periodic table, elements and physical chemistry
Assessed in Paper 1
Practical skills in chemistry, foundations in chemistry (atoms, molecules, equations, stoichiometry, acid-base, redox), periodic table and energy (ionisation energy, electron configuration), periodicity, group 2, halogens, enthalpy changes, entropy, Gibbs free energy, rate of reaction, equilibrium (Kc, Kp), pH and buffers, electrode potentials, transition metals (complexes, ligand substitution, coloured ions, catalysis).
Synoptic assessment of all theoretical concepts across the specification plus Practical Activity Group (PAG) skills covering moles and formula determination, titrations, enthalpy measurements, qualitative ion analysis, organic liquid and solid synthesis, rates of reaction, and electrochemical cells.
Specification terms elid matches
pag1 moles and determination of formula
pag2 acid-base titration
pag3 enthalpy determination
pag4 rates of reaction
pag5 equilibrium
pag6 electrochemical cells
pag7 transition metals and qualitative analysis
pag8 preparation of an inorganic compound
pag9 purification and analysis of an organic solid
pag10 preparation of an organic liquid
practical endorsement
qualitative analysis of ions
organic synthesis
distillation
How the papers are weighted
elid uses these weightings when it decides which topics deserve your revision time first.
Paper
Share of the qualification
Paper 1
37%
Paper 2
37%
Paper 3
26%
Marked the way OCR marks it
Paste an answer you have written and elid marks it point by point against the OCR scheme: which marking points you hit, which you missed, and the sentence that would have earned each missing one. It is the difference between being told an answer is “good” and being told exactly where the marks went.
Ready to try it on your own question? Pick your board once and every answer, mark and flashcard elid gives you follows that specification. Free to start, no card needed. Open elid →