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10.1 Using the Earth's resources and obtaining potable water

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Question 10
F

Water leaving a treatment works still contains dissolved calcium and magnesium compounds. Why are these not removed?

[1]
A

They are not harmful to health, and removing them would cost more

B

They are needed to keep the chlorine dissolved in the water

C

They react with any microbes that survive the sterilising step

D

They make the water boil at a temperature above 100 ∘C100\ ^\circ\text{C}100 ∘C

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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