In a municipal water treatment facility processing water from a reservoir, the water is passed through a rapid gravity filter containing layers of anthracite coal and silica sand.
State the purpose of passing the reservoir water through these filter beds.
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.