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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 1
METALS
Ores of some metals.
By the end of the lesson, the learner should be able to:


Name the chief ores of some metals.


Exposition and brief discussion.
K.L.B. BK IV
Pages 168-9
1 2
METALS
Ores of some metals.
By the end of the lesson, the learner should be able to:


Name the chief ores of some metals.


Exposition and brief discussion.
K.L.B. BK IV
Pages 168-9
1 3-4
METALS
Ores of some metals.
Occurrence and extraction of sodium.
By the end of the lesson, the learner should be able to:


Name the chief ores of some metals.


Describe occurrence and extraction of sodium.


Exposition and brief discussion.
Oral questions on electrolysis and equations at electrodes.
Brief discussion on occurrence and extraction.

Chart: Down?s cell.
K.L.B. BK IV
Pages 168-9
K.L.B. BK IV
Pages 170-171
1 5
METALS
Occurrence and extraction of sodium.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of sodium.
Oral questions on electrolysis and equations at electrodes.
Brief discussion on occurrence and extraction.
Chart: Down?s cell.
K.L.B. BK IV
Pages 170-171
2 1
METALS
Occurrence and extraction of aluminium.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of aluminium.
Brief discussion.
Write relevant chemical equations.
student book
K.L.B. BK IV
Pages 171-3
2 2
METALS
Occurrence and extraction of aluminium.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of aluminium.
Brief discussion.
Write relevant chemical equations.
student book
K.L.B. BK IV
Pages 171-3
2 3-4
METALS
Occurrence and extraction of aluminium.
Occurrence and extraction of iron.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of aluminium.
Describe occurrence and extraction of iron.
Brief discussion.
Write relevant chemical equations.
Brief discussion.
Write relevant chemical equations.
student book
Chart: Blast furnace.
K.L.B. BK IV
Pages 171-3
K.L.B. BK IV
Pages 173-5
2 5
METALS
Occurrence and extraction of iron.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of iron.
Brief discussion.
Write relevant chemical equations.
Chart: Blast furnace.
K.L.B. BK IV
Pages 173-5
3 1
METALS
Occurrence and extraction of zinc.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of zinc by electrolysis and reduction methods.
Brief discussion.
Write relevant chemical equations.
Flow chart: extraction of Zinc.
K.L.B. BK IV
Pages 175-9
3 2
METALS
Occurrence and extraction of zinc.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of zinc by electrolysis and reduction methods.
Brief discussion.
Write relevant chemical equations.
Flow chart: extraction of Zinc.
K.L.B. BK IV
Pages 175-9
3 3-4
METALS
Occurrence and extraction of zinc.
By the end of the lesson, the learner should be able to:
Describe occurrence and extraction of zinc by electrolysis and reduction methods.
Brief discussion.
Write relevant chemical equations.
Flow chart: extraction of Zinc.
K.L.B. BK IV
Pages 175-9
3 5
METALS
Extraction of lead.
By the end of the lesson, the learner should be able to:
Explain how lead is extracted.
Q/A & brief discussion.
Write balanced chemical equations leading to extraction of lead.
Flow chart: extraction of lead.
K.L.B. BK IV
Pages 179-80
4 1
METALS
Occurrence and extraction of copper.
By the end of the lesson, the learner should be able to:
Describe extraction of copper.
Q/A & brief discussion.
Write balanced chemical equations leading to extraction of copper.
Flow chart: extraction of copper.
K.L.B. BK IV
Pages 181-183
4 2
METALS
Occurrence and extraction of copper.
By the end of the lesson, the learner should be able to:
Describe extraction of copper.
Q/A & brief discussion.
Write balanced chemical equations leading to extraction of copper.
Flow chart: extraction of copper.
K.L.B. BK IV
Pages 181-183
4 3-4
METALS
Occurrence and extraction of copper.
By the end of the lesson, the learner should be able to:
Describe extraction of copper.
Q/A & brief discussion.
Write balanced chemical equations leading to extraction of copper.
Flow chart: extraction of copper.
K.L.B. BK IV
Pages 181-183
4 5
METALS
Occurrence and extraction of copper.
By the end of the lesson, the learner should be able to:
Describe extraction of copper.
Q/A & brief discussion.
Write balanced chemical equations leading to extraction of copper.
Flow chart: extraction of copper.
K.L.B. BK IV
Pages 181-183
5 1
METALS
Physical properties of some metals.
By the end of the lesson, the learner should be able to:
State general properties of metals.
Explain the difference in physical properties of metals.
Compare physical properties of some metals as summarized in a chart.
Q/A & discussion based on physical properties.
student book
K.L.B. BK IV
Pages 183-4
5 2
METALS
Physical properties of some metals.
By the end of the lesson, the learner should be able to:
State general properties of metals.
Explain the difference in physical properties of metals.
Compare physical properties of some metals as summarized in a chart.
Q/A & discussion based on physical properties.
student book
K.L.B. BK IV
Pages 183-4
5 3-4
METALS
Reaction of metals with oxygen.
By the end of the lesson, the learner should be able to:
Explain effect of burning metals in air.
Teacher demonstration / Group experiments.
Burning some metals in air.
Write relevant equations.
Brief discussion.
Common lab. metals.
K.L.B. BK IV
Pages 184-6
5 5
METALS
Reaction of metals with oxygen.
By the end of the lesson, the learner should be able to:
Explain effect of burning metals in air.
Teacher demonstration / Group experiments.
Burning some metals in air.
Write relevant equations.
Brief discussion.
Common lab. metals.
K.L.B. BK IV
Pages 184-6
6 1
METALS
Reaction of metals with cold water and steam.
By the end of the lesson, the learner should be able to:
Describe reaction of metals with cold water and steam.

Arrange the metals in order of reactivity with cold water and steam.
Class experiments:
Investigate reaction of some metals with cold water and steam.
Analyse the results.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 186-9
6 2
METALS
Reaction of metals with cold water and steam.
By the end of the lesson, the learner should be able to:
Describe reaction of metals with cold water and steam.

Arrange the metals in order of reactivity with cold water and steam.
Class experiments:
Investigate reaction of some metals with cold water and steam.
Analyse the results.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 186-9
6 3-4
METALS
Reaction of metals with cold water and steam.
By the end of the lesson, the learner should be able to:
Describe reaction of metals with cold water and steam.

Arrange the metals in order of reactivity with cold water and steam.
Class experiments:
Investigate reaction of some metals with cold water and steam.
Analyse the results.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 186-9
6 5
METALS
Reaction of metals with cold water and steam.
By the end of the lesson, the learner should be able to:
Describe reaction of metals with cold water and steam.

Arrange the metals in order of reactivity with cold water and steam.
Class experiments:
Investigate reaction of some metals with cold water and steam.
Analyse the results.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 186-9
7 1
METALS
Reaction of metals with chlorine.
By the end of the lesson, the learner should be able to:
Describe the reaction of metals with chlorine.
Teacher demonstration in a fume cupboard / in the open.
Investigate reaction of metals with chorine
Write corresponding equations.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 189-191
7 2
METALS
Reaction of metals with chlorine.
By the end of the lesson, the learner should be able to:
Describe the reaction of metals with chlorine.
Teacher demonstration in a fume cupboard / in the open.
Investigate reaction of metals with chorine
Write corresponding equations.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 189-191
7 3-4
METALS
Reaction of metals with chlorine.
By the end of the lesson, the learner should be able to:
Describe the reaction of metals with chlorine.
Teacher demonstration in a fume cupboard / in the open.
Investigate reaction of metals with chorine
Write corresponding equations.
Metals: Al, Zn, Fe, Cu.
K.L.B. BK IV
Pages 189-191
7 5
METALS
Reaction of metals with acids.
By the end of the lesson, the learner should be able to:
Describe and explain reaction of metals with acids.
Group experiments: investigate reaction of metals with dilute acids.
Teacher demonstration: investigate reaction of metals with concentrated acids.
Discuss the observations made and write relevant chemical equations.
Metals: Al, Zn, Fe, Cu.

Acids; HCl, HNO3, H2SO4.
K.L.B. BK IV
Pages 191-4
8 1
METALS
Uses of metals.
By the end of the lesson, the learner should be able to:
State uses of some metals and alloys.
Q/A & brief discussion;
Uses of Sodium, Aluminium, Zinc, Iron and Copper & some alloys.
student book
K.L.B. BK IV
Pages 194-7
8 2
METALS
Environmental effects of extraction of metals.
By the end of the lesson, the learner should be able to:
Identify some environmental effects of extraction of metals.
Oral questions and open discussion.

Assignment / Topic review.
student book
K.L.B. BK IV
Pages 197-8
8 3-4
METALS
RADIOACTIVITY
Environmental effects of extraction of metals.
Definition of radioactivity.
By the end of the lesson, the learner should be able to:
Identify some environmental effects of extraction of metals.


Define radioactivity, a nuclide and radioactive decay.
Differentiate between natural and artificial radioactivity.
Oral questions and open discussion.

Assignment / Topic review.


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 197-8
K.L.B. BK IV
Pages 249-251
9

KCSE

10 1
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
10 2
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
10 3-4
RADIOACTIVITY
Alpha particles.
Equations involving 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.

Write down and balance equations involving alpha particles.
Q/A: position of helium in the periodic table.

Expository approach:


Q/A: Review atomic and mass numbers.
Examples of balanced equations.
Supervised practice.
student book
K.L.B. BK IV
Pages 251-253
K.L.B. BK IV
Page 257
10 5
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
11 1
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
11 2
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
11 3-4
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
11 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

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