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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 5

This question is about treating and testing water.

A water quality monitoring station is testing a local water supply after an agricultural runoff incident introduced copper(II) sulfate (CuSO4\text{CuSO}_4CuSO4​) into a regional reservoir.

a.

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

  • Step:

    • Filtration
    • Sedimentation

  • Reason for step:

    • Allow heavy suspended solids to settle to the bottom
    • Remove fine suspended particles by passing water through sand beds
    • Add fluoride to protect teeth
    • Destroy harmful bacteria
[2]
b.

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

  • Chlorine
  • Argon
  • Ultra-violet (UV) light
  • Sulfur dioxide
  • Nitrogen gas
[2]
c.

Which two methods can demonstrate that a sample of water is chemically pure (i.e. contains absolutely no dissolved solids)?

  • Determine if the liquid boils at exactly 100∘C100^\circ\text{C}100∘C at standard pressure.
  • Determine if the liquid freezes at exactly 0∘C0^\circ\text{C}0∘C at standard pressure.
  • Check if the liquid turns anhydrous copper(II) sulfate blue.
  • Add universal indicator to see if it turns green.
[2]
d.

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

  • Ion:

    • Copper(II) ion (Cu2+\text{Cu}^{2+}Cu2+)
    • Sulfate ion (SO42−\text{SO}_4^{2-}SO42−​)

  • Reagent:

    • Acidified barium chloride solution
    • Sodium hydroxide solution
    • Acidified silver nitrate solution
    • Dilute hydrochloric acid
[2]
e.

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

  • Chromatography
  • Decanting
  • Simple 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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