Class: Junior Secondary School 2 (JSS2, JSS 2)
Term: 2nd Term
Week: 10
Age: 13 years
Duration: 45 minutes
Subject: Basic Science And Technology
Curriculum Theme: Basic Science
Previous Lesson: Explanation of Some Phenomena Using Kinetic Theory
Topic: Boiling And Evaporation
Subject Matter: Explanation of boiling and evaporation using kinetic theory, Factors that affect evaporation….

Specific Objectives

Cognitive Domain:
(a) Define boiling and evaporation.
(b) List factors that affect evaporation.
Affective Domain:
(a) Show interest in learning about heat and physical changes.
(b) Display attentiveness during demonstrations.
Psychomotor Domain:
(a) Observe and describe boiling.
(b) Record temperature changes.
Social Domain:
(a) Work in groups during activities.
(b) Share findings respectfully.

Reference Materials

9 Years Basic Education Curriculum
Lagos State Unified Scheme of Work for Junior Secondary Schools
Britannica – Evaporation: Definition and Process (https://www.britannica.com/science/evaporation)
ScienceDirect – Boiling Phenomena and Heat Transfer Principles (https://www.sciencedirect.com/topics/engineering/boiling)
Relevant Textbooks

Instructional Materials

Kettle or pot
Water
Thermometer
Chart showing kinetic theory of matter
Pictures illustrating evaporation
Whiteboard and markers

Rationale for the Lesson

Heat causes important changes in matter.

Prerequisite/Previous Knowledge

Knowledge of states of matter and basic heat concepts.

Lesson Content/Board Summary

Boiling and Evaporation

Meaning of Boiling

Boiling is the rapid change of a liquid into vapour when heat is applied and the liquid reaches its boiling point.

Occurs at a fixed temperature (boiling point)
Bubbles form throughout the liquid
Heat energy is absorbed continuously
Temperature remains constant during boiling

Meaning of Evaporation

Evaporation is the slow change of a liquid into vapour from the surface of the liquid at any temperature below the boiling point.

Occurs at the surface of the liquid
Can happen at any temperature
Increases with heat, airflow, and surface area
Causes cooling of the liquid and surrounding surface

Differences Between Boiling and Evaporation

Boiling occurs at a fixed temperature; evaporation can occur at any temperature
Boiling happens throughout the liquid; evaporation happens only at the surface
Boiling is fast; evaporation is slow
Temperature remains constant during boiling; it may change during evaporation

Factors Affecting Evaporation

Temperature of liquid
Surface area exposed
Air movement (wind)
Humidity

Teaching Methods/Instructional Techniques

Discussion, Lecture, Explanation, Demonstration, Group Work, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 min
Teaching Skill: Set Induction
Teacher’s Activity: Ask questions to recall previous lesson; introduce boiling and evaporation
Pupils’ Activity: Listen and respond
Learning Point: Link to prior knowledge

Step 2: Definition of Boiling

Time: 5 min
Teaching Skill: Explanation
Teacher’s Activity: Present definition of boiling and examples
Pupils’ Activity: Copy definitions
Learning Point: Understand boiling

Step 3: Definition of Evaporation

Time: 5 min
Teaching Skill: Explanation
Teacher’s Activity: Explain evaporation with examples
Pupils’ Activity: Observe and write notes
Learning Point: Understand evaporation

Step 4: Differences and Factors

Time: 10 min
Teaching Skill: Discussion/Demonstration
Teacher’s Activity: List differences and factors affecting evaporation
Pupils’ Activity: Take notes
Learning Point: Distinguish boiling and evaporation

Step 5: Note-Taking

Time: 5 min
Teaching Skill: Guided Practice
Teacher’s Activity: Summarize lesson points
Pupils’ Activity: Write summary
Learning Point: Consolidate learning

Step 6: Evaluation/Review

Time: 10 min
Teaching Skill: Questioning
Teacher’s Activity: Ask:

Define boiling
Define evaporation
List two differences between boiling and evaporation
Name two factors affecting evaporation
Pupils’ Activity: Respond orally or in writing
Learning Point: Assess comprehension

Step 7: Conclusion

Time: 5 min
Teaching Skill: Reinforcement
Teacher’s Activity: Summarize lesson and assign homework
Pupils’ Activity: Listen and note homework
Learning Point: Reinforce knowledge

Lesson Keywords

Boiling – rapid change of liquid to vapor
Evaporation – slow change of liquid to vapor
Kinetic energy – energy of moving particles
Boiling point – temperature at which liquid boils
Humidity – amount of moisture in air

Differentiation

Pair slower learners with stronger peers; provide visual aids and demonstrations.

Note for teachers using this lesson plan

Use clear demonstrations and charts to illustrate differences; encourage active participation.