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6.3 Interpreting and interacting with earth systems

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Question 10

A laboratory tests four samples of water.

For each sample, 100 cm3100\ \mathrm{cm^{3}}100 cm3 of the water is evaporated to dryness.

SampleHarmful microorganismsLevels of dissolved substancesMass of solid left after evaporation in g\mathrm{g}g
Pdetectedwithin safe limits0.020
Qnone detectedwithin safe limits0.015
Rnone detectedabove safe limits0.018
Snone detectedwithin safe limits0.000

Which sample is potable but is not pure water?

[1]
A

Sample R

B

Sample S

C

Sample P

D

Sample Q

Markscheme

6.3 Interpreting and interacting with earth systems Questions

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

109 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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