A-Level Chemistry Practical Skills Revision

Your Year 13 pupils know the chemistry but still lose marks on Paper 3 when the apparatus is unfamiliar, when a plan has to be written in mark-scheme wording, or when a titration or uncertainty calculation goes wrong. Building original exam-style practical questions with a proper mark scheme before mocks takes hours you do not have. This pack covers the practical skills and data analysis for AQA A-Level Chemistry (7405) Paper 3, including the 12 required practicals and the Appendix 5 and 6 assessment skills (planning, implementing, analysis, evaluation).

Your Year 13 pupils know the chemistry but still lose marks on Paper 3 when the apparatus is unfamiliar, when a plan has to be written in mark-scheme wording, or when a titration or uncertainty calculation goes wrong. Building original exam-style practical questions with a proper mark scheme before mocks takes hours you do not have. This pack covers the practical skills and data analysis for AQA A-Level Chemistry (7405) Paper 3, including the 12 required practicals and the Appendix 5 and 6 assessment skills (planning, implementing, analysis, evaluation).

Lesson list

1. Decoding Unfamiliar Apparatus and Contexts: what a described piece of apparatus measures, its resolution and main limitation; a three-step approach to unfamiliar set-ups; 1- to 4-mark questions
2. Planning an Investigation in Mark-Scheme Wording: variables, range, quantities and repeats; method steps and risk statements (for example “excess”, “until constant mass”, “swirl”); marking and improving a 6-mark plan using level descriptors
3. Titration Calculations Without the Slips: concordant titres and mean titre; scaling from a 25.0 cm³ aliquot; mass, percentage purity and hydrated salt formula; finding and correcting the five most common errors; a manganate(VII) with iron(II) calculation to the correct significant figures and units
4. Gas Volumes and Gas-Collection Experiments: pV = nRT with SI units; expected against measured gas volume; reasons for differences; choosing a gas-collection method
5. Uncertainty and Percentage Error: absolute and percentage uncertainty, including readings taken as a difference; combining percentage uncertainties; comparing with percentage error against a data-book value; ranking measurements and justifying a change to the method
6. Evaluate, Conclude and Test Yourself: random error, systematic error and anomalous results; accurate, precise, repeatable and reproducible; judging whether data support a conclusion; specific improvements; a timed mixed practical-skills mini-paper with diagnosis of lost marks by skill

Suitable For
Key Stage: KS5
Year Group: Year 12-13 (sixth form)
Exam Board: AQA (A-Level Chemistry 7405, Paper 3). Practical content also maps to OCR A (H432) Module 1 and Edexcel (9CH0) Paper 3, but the pack is labelled for AQA.
Subject: Chemistry