A student is given a sample of contaminated rock salt, which consists of sodium chloride mixed with insoluble sand and clay impurities.
To isolate pure, dry crystals of sodium chloride from this mixture, the student must perform three main physical processes:
Place these three processes in the correct order in which they must be carried out from start to finish.
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.