• Class: Primary 4
  • Term: 2nd Term
  • Week: 10
  • Age: 9 years
  • Duration: 40 minutes
  • Subject: Basic Science Technology
  • Curriculum Theme: Basic Science
  • Topic: Water
  • Content: Pure And Impure Water

Specific Objectives:

  • Cognitive Domain: Pupils should be able to list and describe the qualities of pure and impure water.
  • Affective Domain: Pupils should develop an understanding and appreciation of the importance of water purity.
  • Psychomotor Domain: Pupils should be able to perform simple tests to distinguish between pure and impure water.
  • Social Domain: Pupils should engage in discussions about water purity and its impact on health and the environment.

Reference Materials:

  • 9 – Years Basic Education Curriculum
  • Abuja Educational Resource Centre Scheme of work
  • NAPPS National Unified Scheme of Work
  • Online Information
  • Textbooks

Instructional Materials:

  • Samples of pure and impure water
  • Charts depicting water purification processes
  • Projector or slides showing effects of impure water

Rationale for the Lesson:

Understanding the concept of pure and impure water is crucial as it relates directly to health, environmental awareness, and science literacy. This knowledge is foundational for promoting healthy living and environmental stewardship among pupils.

Prerequisite/Previous Knowledge:

Basic understanding of water and its common uses.


Content Development: Pure And Impure Water

ContentTimeTeaching MethodTeaching StrategyTeacher’s ActivityPupil’s ActivityLearning Point
Introduction to Water5 minDiscussionInquiry-basedIntroduce topic, ask pupils about their understanding of waterPupils share their prior knowledge about waterEngaging pupils’ interest and assessing prior knowledge
Explaining Pure Water10 minLectureExpositoryExplain the qualities of pure waterListening and asking questionsUnderstanding the concept of pure water
Explaining Impure Water10 minLecture & DemonstrationExpository & InteractiveShow examples of impure water, discuss sources of contaminationObserving and identifying differencesRecognizing impure water
Practical Test5 minPractical ActivityHands-onDemonstrate a simple test to identify pure waterPupils perform the testApplying knowledge in a practical context
Discussion on Water Purity5 minGroup DiscussionCollaborative LearningFacilitate a discussion on the importance of water purityParticipate in group discussionUnderstanding the impact of water purity on health and environment
Note Taking5 minWritingReflectiveGuide pupils to take notesPupils take notesSummarizing and internalizing the lesson
Evaluation3 minQuestion & AnswerAssessmentAsk questions related to the topicPupils respond to questionsAssessing understanding of the topic
Conclusion2 minSummarizingReflectiveSum up the lesson, highlighting key pointsListening and internalizing the summaryReinforcing the lesson’s main points

Classroom Note:

Qualities Of Pure Water

  1. Clear Appearance: Pure water is completely clear and transparent, without any color.
  2. No Smell: It has no distinct smell, indicating the absence of impurities that could cause odors.
  3. No Taste: Pure water should have a neutral taste, without any bitterness, saltiness, or sweetness.
  4. Free of Sediments: There should be no visible particles or sediments floating in or settling at the bottom of pure water.
  5. Safe for Drinking: Pure water is safe for consumption, meaning it doesn’t contain harmful bacteria, viruses, or chemicals.

Qualities Of Impure Water

  1. Cloudy Appearance: Impure water often has a cloudy or look due to suspended particles like dirt or sand.
  2. Unpleasant Odor: It may have a foul or unusual smell, which can be due to the presence of chemicals.
  3. Strange Taste: Impure water can have a metallic, sour, or otherwise unpleasant taste, indicating the presence of various contaminants.
  4. Presence of Microorganisms: Impure water may contain bacteria, viruses, and parasites, which are not visible to the naked eye but can be harmful if consumed.
  5. Contains Chemicals and Metals: It might have harmful chemicals, heavy metals like lead or mercury, or excessive minerals, contributing to its impurity.

Importance Of Clean Water

  1. Health: Clean water is essential for good health.
  2. Hydration: Clean water is crucial for hydration, which is important for all bodily functions.
  3. Cooking: Clean water is necessary for cooking, ensuring that the food prepared is safe and healthy to eat.
  4. Personal Hygiene: It is vital for personal hygiene practices like bathing and brushing teeth.
  5. Agriculture: Clean water is important for agriculture to grow healthy crops, which are vital for nutrition and food security.


  1. What are three qualities of pure water?
  2. Name two differences between pure and impure water.
  3. Why is it important to have access to pure water?

Note to Teachers:

Customize the lesson content, teaching methods, and pupil activities to suit your teaching style, curriculum, and available resources.

Evaluation Questions:

Categorized in:

Lesson Notes,

Last Update: January 29, 2024