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2 marksWater

CAPE Chemistry Unit 2 · 2013 · Paper 2 · Question 3(a)(ii)

Water samples taken downstream from an agricultural and domestic washing community following heavy rainfall contain various pollutants.

Identify two sources of pollutants (other than fertilizers) most likely present in the stream.

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Other parts of this question

  1. 3(a)(i)State the process that may have led to the transport of pollutants into the stream.[1 mark]
  2. 3(b)(i)Describe a laboratory test to identify the presence of nitrates, stating the reagents used and the expected observations.[2 marks]
  3. 3(b)(ii)Describe a laboratory test to identify the presence of phosphates, stating the reagents used and the expected observations.[2 marks]
  4. 3(c)(i)State two ways by which dissolved oxygen enters natural waterways.[2 marks]
  5. 3(c)(ii)Explain how the process of eutrophication causes a decline in water quality.[2 marks]
  6. 3(c)(iii)Explain why dissolved oxygen must be removed from water prior to use in industrial boilers and pipelines.[2 marks]
  7. 3(d)State two main steps involved in municipal water treatment to produce potable water.[2 marks]

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