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10.1 Using the Earth's resources and obtaining potable water

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Question 13
F

Air is bubbled through the effluent in an aeration tank at a sewage works. Why is the air needed?

[1]
A

To dissolve the harmful chemicals so that they can be removed

B

To supply oxygen so that aerobic bacteria can break down waste

C

To stir the effluent so that the solids settle to the bottom

D

To cool the effluent before it is released into the river

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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