Cambridge IGCSE Chemistry
10.1Water
Water in Cambridge IGCSE Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic34 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 10.1.1Describe chemical tests for the presence of water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate.
- 10.1.2Describe how melting point and boiling point are used to test whether water is pure.
- 10.1.3Explain why distilled water rather than tap water is used in practical chemistry: it contains fewer chemical impurities.
- 10.1.4State that water from natural sources may contain dissolved oxygen, metal compounds, plastics, sewage, harmful microbes, nitrates from fertilisers and phosphates from fertilisers and detergents.
- 10.1.5State that some of these substances are beneficial, such as dissolved oxygen for aquatic life and metal compounds that provide essential minerals for life.
- 10.1.6State that some of these substances are potentially harmful: some metal compounds are toxic, some plastics harm aquatic life, sewage contains microbes that cause disease, and nitrates and phosphates lead to deoxygenation of water and damage to aquatic life (details of eutrophication are not required).
- 10.1.7Describe how the domestic water supply is treated: sedimentation and filtration to remove solids, carbon to remove tastes and odours, and chlorination to kill microbes.
Lessons
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Treatment of the water supply
25 min
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Water: tests, sources and pollutants
30 min
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Sample question
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Turn Water into a strength.
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