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Water treatment and purification — KCSE Chemistry

KCSE Chemistry · 51 practice questions · 4 syllabus objectives

17 easy18 medium16 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe the stages of water treatment: sedimentation, filtration, chlorination and fluoridation

Explain the purpose of each stage of water treatment and the chemicals used

Discuss the effects of water pollution and methods of water conservation

Water treatment and purification

Sample Questions

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1
easySHORT ANSWER4 marks

List four methods of conserving water in urban areas. (4 marks)

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Part (a) — 4 marks
Rainwater harvesting systems to collect and store rainwater (1 mk)
Use of water-efficient fixtures like low-flow taps and toilets (1 mk)
Implementing greywater recycling for irrigation and other uses (1 mk)
Awareness campaigns to educate the public on water-saving practices (1 mk)
2
easySHORT ANSWER4 marks

Identify the four main stages of water treatment and state the purpose of each stage. (4 marks)

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Part (a) — 4 marks
Sedimentation: To remove large particles and sediment from water by allowing them to settle at the bottom. (1 mk)
Filtration: To eliminate smaller particles and impurities by passing water through sand and gravel filters. (1 mk)
Chlorination: To disinfect water by killing harmful bacteria and pathogens using chlorine. (1 mk)
Fluoridation: To add fluoride to prevent dental cavities and improve dental health. (1 mk)
3
easySHORT ANSWER3 marks

Define 'filtration' in water treatment and state two materials commonly used as filters.

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Part (a) — 1 mark
Filtration is the process of passing water through a porous material to remove suspended particles and impurities. (1 mk)
Part (b) — 2 marks
Sand (1 mk)
Gravel (1 mk)
4

Define the term 'coagulation' in the context of water treatment and explain its significance.

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Why Practise Water treatment and purification?

KNEC Aligned

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