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6.3 Interpreting and interacting with earth systems

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Question 16

An island needs to produce 250 m³ of potable water each day from seawater. The island has a limited electricity supply. The table shows the energy used by two desalination methods.

MethodEnergy used (kWh per m³ of water)
Distillation12.0
Reverse osmosis4.0
a.

Calculate the energy saved each day by using reverse osmosis instead of distillation.

[2]
b.

Explain why reverse osmosis is suitable for producing potable water on this island. Give two reasons based on how the method works.

[2]
Markscheme

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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