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6.3 Interpreting and interacting with earth systems

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Question 26
F

The table shows information about water from three sources, P, Q and R.

SourceInsoluble solidsDissolved salts (g/dm3\mathrm{g/dm^{3}}g/dm3)Microorganisms
Pnone0.2present
Qlarge amount0.3present
Rnone35none

A dissolved salt content below 0.5 g/dm30.5\ \mathrm{g/dm^{3}}0.5 g/dm3 is safe to drink.

Which option shows the treatment each source needs to make it potable?

[1]
A

P: chlorination only; Q: sedimentation, filtration and chlorination; R: distillation

B

P: distillation; Q: filtration only; R: chlorination only

C

P: chlorination only; Q: chlorination only; R: filtration

D

P: filtration and chlorination; Q: sedimentation and filtration only; R: distillation

Markscheme

6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

51 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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