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10.1 Using the Earth's resources and obtaining potable water

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Question 11
H

At a water treatment works the water is passed through filter beds before it is sterilised. Suggest why this order is used.

[1]
A

Filtering raises the temperature of the water, so sterilising is faster

B

Filtering removes the dissolved salts that would react with the chlorine

C

Filtering kills most of the microbes, so less chlorine has to be added

D

Filtering removes solids that could shield microbes from the sterilising agent

Markscheme

10.1 Using the Earth's resources and obtaining potable water Questions

  1. GCSE
  2. /Chemistry
  3. /10.1 Using the Earth's resources and obtaining potable water

40 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.

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