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6.3 Interpreting and interacting with earth systems

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Question 32

At a temporary field station, water is processed in batches before it is sterilised. The station processes 120 m3120\ \mathrm{m^{3}}120 m3 in each batch and completes 6 batches per day for 7 days.

Chlorine is added at a dose of 2.0 mg per dm3\mathrm{dm^{3}}dm3.

The chlorine is supplied in full drums, each containing 10 kg.

1 m3=1000 dm31\ \mathrm{m^{3}} = 1000\ \mathrm{dm^{3}}1 m3=1000 dm3

1 kg=1 000 000 mg1\ \mathrm{kg} = 1\,000\,000\ \mathrm{mg}1 kg=1000000 mg

Calculate the minimum number of full drums of chlorine needed for the seven days.

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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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