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10.1 Using the Earth's resources and obtaining potable water

10.1 Using the Earth's resources and obtaining potable water

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Question 6

This question is about treating and testing water.

A water treatment facility is testing a local water supply after an accidental leakage of iron(III) chloride (FeCl3\text{FeCl}_3FeCl3​) into a holding reservoir.

a.

Draw one line from each treatment step to the main reason for that step.

  • Step:

    • Coagulation
    • Sterilisation

  • Reason for step:

    • Kill harmful microbes
    • Remove large floating debris
    • Cause small suspended particles to clump together
    • Neutralise acidic compounds
[2]
b.

Which two of the following substances are commonly used to sterilise fresh drinking water? Choose two options.

  • Chlorine
  • Nitrogen
  • Ozone
  • Carbon dioxide
  • Helium
[2]
c.

Which two methods can demonstrate the presence of dissolved solids in a sample of water?

  • Test the sample's boiling point.
  • Check if the liquid turns blue cobalt chloride paper pink.
  • Evaporate all the liquid to see if a solid residue remains.
  • Add universal indicator solution to the sample.
[2]
d.

Separate samples are tested to identify the ions present in the iron(III) chloride contaminant. Draw one line from each ion to the correct chemical reagent needed to identify it.

  • Ion:

    • Iron(III) ion (Fe3+\text{Fe}^{3+}Fe3+)
    • Chloride ion (Cl−\text{Cl}^-Cl−)

  • Reagent:

    • Barium chloride solution
    • Silver nitrate solution
    • Sodium hydroxide solution
    • Dilute hydrochloric acid
[2]
e.

How can pure water be produced from a sample of water containing dissolved solids?

  • Chromatography
  • Decanting
  • Distillation
  • Filtration
[1]
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

11 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 (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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