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SCHEME OF WORK
Chemistry
Form 4 2025
TERM II
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WK LSN TOPIC SUB-TOPIC OBJECTIVES T/L ACTIVITIES T/L AIDS REFERENCE REMARKS
2 1-2
ELECTRO-CHEMISTRY.
Redox reactions.
Oxidizing Numbers.
By the end of the lesson, the learner should be able to:


Describe redox reactions in terms of gain / loss of electrons.
Identify oxidizing / reducing agents involved in redox reactions.

Outline rules of assigning oxidation numbers.
Determine the oxidation numbers of an element in a given compound.
Explain the use of oxidation numbers in naming compounds.


Q/A: review cations, anions and charges.
Write down ionic half equations and identify reducing / oxidizing agents.
Exposition and giving specific examples.
Work out oxidizing number of elements in given compounds.
Copy and complete a table of compounds containing elements that more than one oxidation number.
student book
K.L.B. BK IV
Pages 108-9
K.L.B. BK IV
Pages 109-116
2 3
ELECTRO-CHEMISTRY.
Oxidizing Numbers.
By the end of the lesson, the learner should be able to:
Outline rules of assigning oxidation numbers.
Determine the oxidation numbers of an element in a given compound.
Explain the use of oxidation numbers in naming compounds.
Exposition and giving specific examples.
Work out oxidizing number of elements in given compounds.
Copy and complete a table of compounds containing elements that more than one oxidation number.
student book
K.L.B. BK IV
Pages 109-116
2 4
ELECTRO-CHEMISTRY.
Displacement reactions.
By the end of the lesson, the learner should be able to:
Explain change of oxidation numbers during redox / displacement reactions. Arrange elements in order of their reducing power.
Class standard experiments: reacting metals with solutions containing metal ions.
Taking note of reactions and those that do not take place; and tabulating the results.
Metals: Ca, Na, Zn, Fe, Pb, and Cu.
Solutions containing Ca2+, Mg2+, Zn2+, Fe2+.
K.L.B. BK IV
Pages 116-120
2 5
ELECTRO-CHEMISTRY.
Displacement reactions.
By the end of the lesson, the learner should be able to:
Explain change of oxidation numbers during redox / displacement reactions. Arrange elements in order of their reducing power.
Class standard experiments: reacting metals with solutions containing metal ions.
Taking note of reactions and those that do not take place; and tabulating the results.
Metals: Ca, Na, Zn, Fe, Pb, and Cu.
Solutions containing Ca2+, Mg2+, Zn2+, Fe2+.
K.L.B. BK IV
Pages 116-120
2 6
ELECTRO-CHEMISTRY.
The oxidizing power of an element.
By the end of the lesson, the learner should be able to:
Arrange elements in order of their oxidizing power.
Teacher demonstration / group expts:
Adding halogens to solutions containing halide ions.
Tabulate the results.
Discuss the results and arrive at the oxidizing power series of halogens.
Halogens:
Cl2 (g),
Br2 (l),
I2 (s).

Halides:
KCl, KBr, KI.
K.L.B. BK IV
Pages 120-122
3 1-2
ELECTRO-CHEMISTRY.
Cell diagrams.
By the end of the lesson, the learner should be able to:
Define the terms electrode, potential and e.m.f. of an electrochemical cell.
Describe components of a cell diagram.
Draw cell diagrams using correct notations.
Teacher demonstration: Zinc/ copper cell.
Q/A & discussion: changes in oxidation numbers.
Exposition: cell diagram and deducing the direction of electron flow.
Zinc/ copper cell.
K.L.B. BK IV
Pages 123-128
3 3
ELECTRO-CHEMISTRY.
Standard Electrode Potentials.
By the end of the lesson, the learner should be able to:
Identify standard conditions for measuring electrode potentials.
Define the term standard electrode potential of a cell.
Write half reactions of electrochemical cells.
Descriptive and expository approaches: teacher exposes new concepts.
student book
K.L.B. BK IV
Pages 129-131
3 4
ELECTRO-CHEMISTRY.
Standard electrode potential series.
By the end of the lesson, the learner should be able to:
Recall the order of standard electrode potentials.
Compare oxidizing and reducing powers of substances.
Q/A: review reactivity series, oxidizing agent, reducing agent.
Exposition: the order of standard electrode potentials.
Discussion: oxidizing and reducing powers of substances.
student book
K.L.B. BK IV
Pages 131-133
3 5
ELECTRO-CHEMISTRY.
Standard electrode potential series.
By the end of the lesson, the learner should be able to:
Recall the order of standard electrode potentials.
Compare oxidizing and reducing powers of substances.
Q/A: review reactivity series, oxidizing agent, reducing agent.
Exposition: the order of standard electrode potentials.
Discussion: oxidizing and reducing powers of substances.
student book
K.L.B. BK IV
Pages 131-133
3 6
ELECTRO-CHEMISTRY.
Emf of a cell.
By the end of the lesson, the learner should be able to:
Calculate emf of a cell using standard electrodes potentials.
Q/A: review half-cells.
Worked examples; supervised practice.
Assignment.
student book
K.L.B. BK IV
Pages 133-136
4 1-2
ELECTRO-CHEMISTRY.
Possibility of a reaction to take place.
By the end of the lesson, the learner should be able to:
Predict whether a reaction will take place or not using standard electrode potentials.
Worked examples.
Oral exercise.
Assignment.
student book
K.L.B. BK IV
Pages 136-137
4 3
ELECTRO-CHEMISTRY.
Primary and secondary chemical cells.
By the end of the lesson, the learner should be able to:
Describe the functioning of primary and secondary chemical cells.
Exposition of new concepts and brief discussion
Assignment.
student book
K.L.B. BK IV
Pages 138-141
4 4
ELECTRO-CHEMISTRY.
Electrolysis of dilute NaCl.
By the end of the lesson, the learner should be able to:
Define the term electrolysis.
Explain the concept of preferential discharge of ions.
Teacher demonstration: electrolysis of dilute sodium chloride with carbon electrodes.
Test for gases collected.
Write down equations of reactions at each electrode.
Discussion: preferential discharge of ions at electrodes.
Dilute sodium chloride voltameter.
K.L.B. BK IV
Pages 141-144
4 5
ELECTRO-CHEMISTRY.
Electrolysis of dilute NaCl.
By the end of the lesson, the learner should be able to:
Define the term electrolysis.
Explain the concept of preferential discharge of ions.
Teacher demonstration: electrolysis of dilute sodium chloride with carbon electrodes.
Test for gases collected.
Write down equations of reactions at each electrode.
Discussion: preferential discharge of ions at electrodes.
Dilute sodium chloride voltameter.
K.L.B. BK IV
Pages 141-144
4 6
ELECTRO-CHEMISTRY.
Electrolysis of brine.
By the end of the lesson, the learner should be able to:
Identify products of electrolysis of brine.
Teacher demonstration/ group experiments.
Test for the products of electrolysis.
Write relevant equations.
Brine voltameter.
K.L.B. BK IV
Pages 144-146
5 1-2
ELECTRO-CHEMISTRY.
Electrolysis of dilute sulphuric (VI) acid.
By the end of the lesson, the learner should be able to:
Identify products of electrolysis of dilute sulphuric (VI) acid.
Teacher demonstration/ group experiments.
Test for the products of electrolysis.
Write relevant equations.
Sulphuric acid voltameter.
K.L.B. BK IV
Pages 146-148
5 3
ELECTRO-CHEMISTRY.
Factors affecting electrolysis.
By the end of the lesson, the learner should be able to:
Explain factors that affect electrolytic products discharged at electrodes.
Q/A: review the electrochemical series of elements.
Teacher writes down order of ease of discharge of ions at electrodes.
Discussion: other factors; giving suitable examples.
student book
K.L.B. BK IV
Pages 153-5
5 4
ELECTRO-CHEMISTRY.
Factors affecting electrolysis.
By the end of the lesson, the learner should be able to:
Explain factors that affect electrolytic products discharged at electrodes.
Q/A: review the electrochemical series of elements.
Teacher writes down order of ease of discharge of ions at electrodes.
Discussion: other factors; giving suitable examples.
student book
K.L.B. BK IV
Pages 153-5
5 5
ELECTRO-CHEMISTRY.
Application of electrolysis.
By the end of the lesson, the learner should be able to:
Describe some applications of electrolysis.
Probing questions and brief discussion on applications of electrolysis.
Practical assignment on electrolysis: electroplating an iron nail with a suitable metal.
Suitable voltameter.
K.L.B. BK IV
Pages 155-7
5 6
ELECTRO-CHEMISTRY.
Faraday?s law of electrolysis.
By the end of the lesson, the learner should be able to:
State Faraday?s law of electrolysis.
Solve problems related to Faraday?s law of electrolysis.
Discuss above results, leading to Faraday?s law of electrolysis.

Worked examples.

Assignment.
Weighing balance, stop watch, copper sulphate voltameter.
K.L.B. BK IV
Pages 161-4
6 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
6 3
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
6 4
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
6 5
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
6 6
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
7 1-2
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
7 3
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
7 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
7 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
7 6
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
8

Midterm

9 1-2
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
9 3
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
9 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
9 5
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
9 6
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
10 1-2
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
10 3
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
10 4
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
10 5
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
10 6
ORGANIC CHEMISTRY II (ALKANES & ALKANOIC ACIDS)
Alkanols (Alcohols).
By the end of the lesson, the learner should be able to:



Identify the functional group of alkanols.

Explain formation of alkanol molecules.



Q/A: review alkanes, alkenes and alkynes.

Teacher exposes new concepts and links them with already known concepts.
student book
K.L.B. BK IV
Page 205
11 1-2
ORGANIC CHEMISTRY II (ALKANES & ALKANOIC ACIDS)
Nomenclature of alkanols.
By the end of the lesson, the learner should be able to:
Name and draw the structure of simple alkanols.
Guided discovery of naming system for alkanols.
Draw and name structures of alkanols.
student book
K.L.B. BK IV
Pages 206-8
11 3
ORGANIC CHEMISTRY II (ALKANES & ALKANOIC ACIDS)
Isomerism in alkanols.
By the end of the lesson, the learner should be able to:
Describe positional and chain isomerism in alkanols.
Explain formation of primary and secondary alkanols.
Q/A: review the terms positional and chain isomerism.
Brief discussion on isomerism.
Oral exercise: naming given organic compounds.
Written exercise: writing structural formulae for isomers of organic compounds of a given molecular formula.
student book
K.L.B. BK IV
Pages 208-10
11 4
ORGANIC CHEMISTRY II (ALKANES & ALKANOIC ACIDS)
Isomerism in alkanols.
By the end of the lesson, the learner should be able to:
Describe positional and chain isomerism in alkanols.
Explain formation of primary and secondary alkanols.
Q/A: review the terms positional and chain isomerism.
Brief discussion on isomerism.
Oral exercise: naming given organic compounds.
Written exercise: writing structural formulae for isomers of organic compounds of a given molecular formula.
student book
K.L.B. BK IV
Pages 208-10
11 5
ORGANIC CHEMISTRY II (ALKANES & ALKANOIC ACIDS)
Preparation of ethanol in the lab.
By the end of the lesson, the learner should be able to:
Describe preparation of ethanol in the laboratory.
Group experiments / teacher demonstration.

Discuss the fermentation process.
Calcium hydroxide solution, sugar solution, yeast.
K.L.B. BK IV
Pages 210-11
11 6
ORGANIC CHEMISTRY II (ALKANES & ALKANOIC ACIDS)
Preparation of ethanol in the lab.
By the end of the lesson, the learner should be able to:
Describe preparation of ethanol in the laboratory.
Group experiments / teacher demonstration.

Discuss the fermentation process.
Calcium hydroxide solution, sugar solution, yeast.
K.L.B. BK IV
Pages 210-11
12 1-2
RADIOACTIVITY
Definition of radioactivity.
Alpha particles.
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.


State properties of alpha particles.
Describe methods of detecting alpha particles.


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.


Q/A: position of helium in the periodic table.

Expository approach:

student book
K.L.B. BK IV
Pages 249-251
K.L.B. BK IV
Pages 251-253
12 3
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
12 4
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
12 5
RADIOACTIVITY
Radioactive Half-Life.
Radioactive decay curve.
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.
Graph papers.
K.L.B. BK IV
Pages 253-4
12-14

End term exam and marking
14 4
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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