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3.2 Methods of separating and purifying substances

3.2 Methods of separating and purifying substances

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Question 32

Waste water can be treated to produce potable water.

The stages of treatment include sedimentation, filtration, and sterilisation.

What is filtration?

A

Soluble salts are removed by adding a chemical precipitant

B

Insoluble solids are removed by passing the water through a mesh or beds of sand and gravel

C

Pathogens are killed by adding chlorine or ozone

D

Suspended particles are allowed to settle to the bottom of a tank

Markscheme

3.2 Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Methods of separating and purifying substances

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.

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