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6.3 Interpreting and interacting with earth systems

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Question 38

A small food-processing site is considering two sources of water for use as drinking water. Tests on the sources give these results.

SourceInsoluble particlesDissolved saltsOrganic matterHarmful microorganisms
Reservoir waterPresentLowNot detectedPresent
Waste water from pickling vegetables in brinePresentHighPresentPresent

The site has these treatment processes available: sand filtration, sedimentation, treatment by bacteria, reverse osmosis and chlorination.

Suggest which treatments should be used for each source, and explain why the two sources need different treatments. Use the information in the table.

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6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

109 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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