A student is provided with a beaker containing a mixture of insoluble silicon dioxide (sand), dissolved copper(II) sulfate, water, and ethanol (boiling point 78∘C78^\circ\text{C}78∘C).
Which sequence of separation techniques should the student perform, in the correct order, to isolate pure, dry samples of silicon dioxide, liquid ethanol, and copper(II) sulfate crystals?
29 exam-style questions on Edexcel IGCSE Chemistry Elements, compounds and mixtures. Each one has a worked solution and a mark scheme showing where the marks go.