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SCHEME OF WORK
Chemistry
Form 4 2025
TERM III
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WK LSN TOPIC SUB-TOPIC OBJECTIVES T/L ACTIVITIES T/L AIDS REFERENCE REMARKS
1

Opening of School and Revision Of End Term 2 Exams

2 1
RADIOACTIVITY
Definition of radioactivity.
By the end of the lesson, the learner should be able to:


Define radioactivity, a nuclide and radioactive decay.
Differentiate between natural and artificial radioactivity.


Q/A: Review the atomic structure.
Exposition: symbolic representation of an atom / nucleus.
Exposition: meaning of radioactivity and radioactive decay.
Discussion: artificial and natural radioactivity.

student book
K.L.B. BK IV
Pages 249-251
2 2
RADIOACTIVITY
Definition of radioactivity.
By the end of the lesson, the learner should be able to:


Define radioactivity, a nuclide and radioactive decay.
Differentiate between natural and artificial radioactivity.


Q/A: Review the atomic structure.
Exposition: symbolic representation of an atom / nucleus.
Exposition: meaning of radioactivity and radioactive decay.
Discussion: artificial and natural radioactivity.

student book
K.L.B. BK IV
Pages 249-251
2 3-4
RADIOACTIVITY
Definition of radioactivity.
By the end of the lesson, the learner should be able to:


Define radioactivity, a nuclide and radioactive decay.
Differentiate between natural and artificial radioactivity.


Q/A: Review the atomic structure.
Exposition: symbolic representation of an atom / nucleus.
Exposition: meaning of radioactivity and radioactive decay.
Discussion: artificial and natural radioactivity.

student book
K.L.B. BK IV
Pages 249-251
2 5
RADIOACTIVITY
Alpha particles.
By the end of the lesson, the learner should be able to:
State properties of alpha particles.
Describe methods of detecting alpha particles.
Q/A: position of helium in the periodic table.

Expository approach:

student book
K.L.B. BK IV
Pages 251-253
3

Opener Exams
4 1
RADIOACTIVITY
Equations involving alpha particles.
By the end of the lesson, the learner should be able to:
Write down and balance equations involving alpha particles.
Q/A: Review atomic and mass numbers.
Examples of balanced equations.
Supervised practice.
student book
K.L.B. BK IV
Page 257
4 2
RADIOACTIVITY
Beta particles. Gamma rays.
By the end of the lesson, the learner should be able to:
State properties of beta particles.
Define isotopes and isobars.
Write down balanced equations involving both alpha and beta particles.
State properties of gamma rays.
Q/A: Review isotopes.
Expository approach: teacher briefly exposes new concepts.
Examples of equations.
Supervised practice.

Assignment.
student book
K.L.B. BK IV
Pages 251-253
4 3-4
RADIOACTIVITY
Beta particles. Gamma rays.
Radioactive Half-Life.
By the end of the lesson, the learner should be able to:
State properties of beta particles.
Define isotopes and isobars.
Write down balanced equations involving both alpha and beta particles.
State properties of gamma rays.

Define the term radioactive half-life. Solve problems relating to half ?life
Q/A: Review isotopes.
Expository approach: teacher briefly exposes new concepts.
Examples of equations.
Supervised practice.

Assignment.

Teacher demonstration: Dice experiment.
Exposition of the term half-life.
Worked examples.
Written exercise
student book
Dice.
K.L.B. BK IV
Pages 251-253
K.L.B. BK IV
Pages 253-4
4 5
RADIOACTIVITY
Radioactive Half-Life.
By the end of the lesson, the learner should be able to:
Define the term radioactive half-life. Solve problems relating to half ?life
Teacher demonstration: Dice experiment.
Exposition of the term half-life.
Worked examples.
Written exercise
Dice.
K.L.B. BK IV
Pages 253-4
5 1
RADIOACTIVITY
Radioactive decay curve.
By the end of the lesson, the learner should be able to:
Plot a radioactive decay curve to deduce the
half ?life from the curve.
Drawing a radioactive decay curve inferring the half-life of the sample from the graph.
Graph papers.
K.L.B. BK IV
Pages 254-5
5 2
RADIOACTIVITY
Radioactive decay curve.
By the end of the lesson, the learner should be able to:
Plot a radioactive decay curve to deduce the
half ?life from the curve.
Drawing a radioactive decay curve inferring the half-life of the sample from the graph.
Graph papers.
K.L.B. BK IV
Pages 254-5
5 3-4
RADIOACTIVITY
Radioactive decay curve.
Nuclear fusion and nuclear fission. Applications of radioactivity.
By the end of the lesson, the learner should be able to:
Plot a radioactive decay curve to deduce the
half ?life from the curve.
Differentiate between nuclear fusion and nuclear fission.
Describe applications of radioactivity.
Drawing a radioactive decay curve inferring the half-life of the sample from the graph.

Exposition of new concepts accompanied by nuclear equations.
Brief discussion: Carbon dating, detecting leakage, medication, agriculture, industry; effect of static charges, etc.
Graph papers.
student book
K.L.B. BK IV
Pages 254-5
K.L.B. BK IV
Pages 259-260
5 5
RADIOACTIVITY
Nuclear fusion and nuclear fission. Applications of radioactivity.
By the end of the lesson, the learner should be able to:
Differentiate between nuclear fusion and nuclear fission.
Describe applications of radioactivity.
Exposition of new concepts accompanied by nuclear equations.
Brief discussion: Carbon dating, detecting leakage, medication, agriculture, industry; effect of static charges, etc.
student book
K.L.B. BK IV
Pages 259-260
6-7

Revision

8-9

End Term 3 Exams

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