IGCSE Chemistry Revision Notes Water

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Syllabus Objectives

IGCSE: Chemistry of the environment

Sub Topic:10.1 Water

Syllabus Objectives:

CORE:

  • Describe chemical tests for the presence of water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate
  • Describe how to test for the purity of water using melting point and boiling point
  • Explain that distilled water is used in practical chemistry rather than tap water because it contains fewer chemical impurities
  • State that water from natural sources may contain substances, including:
  • (a) dissolved oxygen
  • (b) metal compounds
  • (c) plastics
  • (d) sewage
  • (e) harmful microbes
  • (f) nitrates from fertilisers
  • (g) phosphates from fertilisers and detergents
  •  State that some of these substances are beneficial, including:
  • (a) dissolved oxygen for aquatic life
  • (b) some metal compounds provide essential minerals for life
  • State that some of these substances are potentially harmful, including:
  • (a) some metal compounds are toxic
  • (b) some plastics harm aquatic life
  • (c) sewage contains harmful microbes which cause disease
  • (d) nitrates and phosphates lead to deoxygenation of water and damage to aquatic life Details of the eutrophication process are not required
  •  Describe the treatment of the domestic water supply in terms of:
  • (a) sedimentation and filtration to remove solids
  • (b) use of carbon to remove tastes and odours
  • (c) chlorination to kill microbes

Revision Notes

IGCSE Chemistry Revision Notes Water

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