Chemistry · IGCSE · Cambridge · Cambridge IGCSE (9–1) Chemistry 0971 (Extended) (2026–2028) · Specification point · 10.1 · Chemistry of the environment
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10.1 Water
| Core | Supplement |
|---|---|
1 Describe chemical tests for the presence of water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate | |
2 Describe how to test for the purity of water using melting point and boiling point | |
3 Explain that distilled water is used in practical chemistry rather than tap water because it contains fewer chemical impurities | |
4 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 | |
5 State that some of these substances are beneficial, including: (a) dissolved oxygen for aquatic life (b) some metal compounds provide essential minerals for life
6 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 |
7 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 |