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6.3 Interpreting and interacting with earth systems

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Question 26

An emergency water-treatment unit can make drinking water from river water or from sea water.

Statement 1: Aluminium sulfate is added to river water to kill harmful microorganisms.

Statement 2: The brine left after reverse osmosis is saltier than the sea water that was pumped in.

Statement 3: Ultraviolet light can be used instead of chlorine to kill harmful microorganisms.

Statement 4: Distillation uses less energy than reverse osmosis because it does not require high-pressure pumps.

Which statements are correct?

[1]
A

1 and 4 only

B

1 and 2 only

C

3 and 4 only

D

2 and 3 only

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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