Practise AQA GCSE Chemistry 8.1 Purity, formulations and chromatography with exam-style questions for Foundation and Higher tier. 28 questions covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography, matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.