A mixture contains sand, sodium chloride and water. Which sequence obtains dry salt?
Filter, then crystallise the filtrate
Distil, then filter the distillate
Evaporate to dryness, then filter
Crystallise first, then filter the sand from the crystals
107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.