Which substance is matched with the best method for obtaining it from the mixture?
water from sea water, by filtration
hydrated copper sulfate crystals from its solution, by evaporating to dryness
ethanol from a mixture of ethanol and water, by simple distillation
water from a solution of ink, by simple distillation
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.