Inorganic Chemistry

Periodicity - Preparation of chlorine and physical properties of group VII elements

By the end of the lesson, the learner should be able to:
- Prepare chlorine gas in the laboratory
- Describe physical properties of halogens
- Relate chlorine's properties to its use in water treatment and disinfection

In groups, learners are guided to:
- Set up apparatus to prepare chlorine gas from concentrated HCl and potassium manganate (VII)
- Observe colour, smell and solubility of chlorine
- Compare physical properties of fluorine, chlorine, bromine and iodine

Why is chlorine collected by downward delivery?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 131
- Concentrated HCl
- Potassium manganate (VII)
- Gas jars
- Delivery tubes

- Practical report - Observation - Written exercises

Inorganic Chemistry

Periodicity - Melting, boiling points and gradation in size of group VII elements

By the end of the lesson, the learner should be able to:
- Describe trends in melting and boiling points of halogens
- Describe trends in atomic and ionic radii of group VII elements
- Relate physical states to intermolecular forces and room temperature applications

In groups, learners are guided to:
- Analyse data on melting and boiling points of halogens
- Plot graphs of melting and boiling points against atomic number
- Analyse data on atomic and ionic radii
- Discuss Van der Waals forces in halogens

Why is iodine a solid while chlorine is a gas at room temperature?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 135
- Graph paper
- Data tables
- Digital devices

- Data analysis - Written exercises - Oral questions

Inorganic Chemistry

Periodicity - Reactions of group VII elements with water and metals

By the end of the lesson, the learner should be able to:
- Investigate reactions of halogens with water and metals
- Write balanced equations for the reactions
- Relate halogen reactivity to their use in antiseptics and disinfectants

In groups, learners are guided to:
- Bubble chlorine gas into distilled water and test with litmus paper
- Add bromine and iodine to water and observe
- Pass chlorine gas over heated iron wool
- Write chemical equations for reactions

Why does chlorine turn moist blue litmus paper red and then white?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 139
- Chlorine gas
- Bromine water
- Iodine crystals
- Iron wool
- Litmus paper

- Practical report - Written exercises - Observation

Inorganic Chemistry

Periodicity - Displacement reactions and bleaching action of chlorine
Periodicity - Applications of group VII elements

By the end of the lesson, the learner should be able to:
- Investigate displacement reactions of halogens
- Investigate the bleaching action of chlorine
- Relate displacement reactions to water purification and textile bleaching
- Outline applications of group VII elements
- Relate properties to specific uses
- Identify uses in water treatment, photography, medicine and refrigeration

In groups, learners are guided to:
- Bubble chlorine gas through solutions of potassium bromide and potassium iodide
- Observe colour changes and identify products
- Investigate bleaching action of chlorine on coloured cloth and flower petals
- Write chemical equations for displacement reactions
- Search for information on applications of halogens
- Discuss uses of chlorine in water treatment, bromine in photography, iodine in medicine
- Create presentations on halogen applications

Why can chlorine displace bromine and iodine from their compounds?
How is chlorine used to make drinking water safe?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 142
- Potassium bromide solution
- Potassium iodide solution
- Chlorine gas
- Coloured cloth
- Flower petals
- Access & Learn Chemistry Learner's Book Grade 10 pg. 147
- Digital devices
- Reference materials

- Practical report - Written exercises - Observation
- Written assignments - Group presentations - Oral questions

Inorganic Chemistry

Periodicity - Physical properties and applications of noble gases

By the end of the lesson, the learner should be able to:
- Describe physical properties of noble gases
- Outline applications of group VIII elements
- Relate noble gas properties to uses in lighting, welding and medical imaging

In groups, learners are guided to:
- Analyse data on atomic radii, ionisation energy, melting and boiling points of noble gases
- Discuss why noble gases are unreactive
- Search for information on uses of helium, neon and argon

Why are noble gases called inert gases?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 148
- Periodic table
- Digital devices
- Reference materials

- Written exercises - Oral questions - Group discussions

Inorganic Chemistry

Periodicity - Atomic size, ionisation energy and electronegativity across period 3

By the end of the lesson, the learner should be able to:
- Describe trends in atomic size and ionisation energy across period 3
- Plot graphs showing trends across the period
- Relate effective nuclear charge to changes in atomic properties

In groups, learners are guided to:
- Draw atomic structures of period 3 elements
- Analyse data on atomic radii and ionisation energies
- Plot graphs of ionisation energy against atomic number
- Discuss the role of effective nuclear charge

Why does atomic radius decrease across period 3?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 151
- Graph paper
- Periodic table
- Data tables

- Data analysis - Written exercises - Oral questions

Inorganic Chemistry

Periodicity - Reactions of period 3 elements with oxygen and water

By the end of the lesson, the learner should be able to:
- Investigate reactions of period 3 elements with oxygen and water
- Write balanced equations for the reactions
- Relate oxide formation to acidic and basic properties of substances

In groups, learners are guided to:
- Burn sodium, magnesium and sulphur in oxygen
- Test products with litmus paper to determine acidic or basic nature
- Investigate reactions of sodium and magnesium with water and steam
- Write chemical equations for all reactions

Why are metallic oxides basic while non-metallic oxides are acidic?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 155
- Sodium, magnesium, sulphur
- Gas jar of oxygen
- Bunsen burner
- Litmus paper
- Distilled water

- Practical report - Written exercises - Observation

Inorganic Chemistry
Physical Chemistry

Periodicity - Reactions of period 3 elements with chlorine and dilute acids
Acids and Bases - Dissociation of acids in aqueous solutions
Acids and Bases - Dissociation of bases in aqueous solutions

By the end of the lesson, the learner should be able to:
- Investigate reactions of period 3 elements with chlorine and dilute acids
- Write balanced equations for the reactions
- Connect periodic trends to prediction of element behaviour in chemical reactions
- Define dissociation of acids in water
- Demonstrate dissociation of acids in aqueous solutions
- Relate dissociation of acids to everyday substances like vinegar and lemon juice

In groups, learners are guided to:
- Pass chlorine gas over heated sodium and magnesium
- Investigate reactions of magnesium with dilute HCl, dilute H₂SO₄ and dilute HNO₃
- Test gases produced
- Write chemical equations for all reactions
- Summarise trends in chemical properties across period 3
- Discuss with peers the meaning of dissociation of acids in water
- Carry out experiments to demonstrate dissociation of dilute hydrochloric acid
- Record observations on release of hydrogen ions (H⁺)

How do the chemical properties of elements change across period 3?
How do acids behave when dissolved in water?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 158
- Chlorine gas
- Dilute acids
- Sodium, magnesium
- Test tubes
- Bunsen burner
- Access & Learn Chemistry Learner's Book Grade 10 pg. 164
- Dilute hydrochloric acid
- Test tubes
- pH indicator paper
- Digital resources
- Access & Learn Chemistry Learner's Book Grade 10 pg. 166
- Sodium hydroxide solution
- Phenolphthalein indicator
- Red and blue litmus paper
- Test tubes

- Practical report - Written exercises - Oral questions
- Observation - Oral questions - Written exercises

Physical Chemistry

Acids and Bases - Properties of acids
Acids and Bases - Properties of bases

By the end of the lesson, the learner should be able to:
- Describe the physical properties of acids
- Identify acids based on their characteristics
- Relate properties of acids to food preservation using citric acid and vinegar

In groups, learners are guided to:
- Discuss with peers the properties of acids (sour taste, effect on litmus paper, pH values)
- Classify acids as organic and mineral acids
- Identify common acids found at home and in the laboratory

What are the characteristic properties of acids?

- Chemistry Learner's Book Grade 10 pg. 166
- Samples of acids
- pH indicator paper
- Blue litmus paper
- Digital resources
- Access & Learn Chemistry Learner's Book Grade 10 pg. 167
- Sodium hydroxide solution
- Baking soda
- Soap solution
- Red litmus paper
- Phenolphthalein

- Observation - Oral questions - Written assignments

Physical Chemistry

Acids and Bases - Reaction of dilute acids with metals
Acids and Bases - Confirmatory test for hydrogen gas

By the end of the lesson, the learner should be able to:
- Describe the reaction between dilute acids and metals
- Carry out experiments on acid-metal reactions
- Relate acid-metal reactions to corrosion of metallic structures and pipes

In groups, learners are guided to:
- Measure dilute hydrochloric acid and add zinc powder
- Observe effervescence and test gas produced using burning splint
- Write balanced equations for the reactions

What products are formed when acids react with metals?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 169
- Zinc powder
- Dilute hydrochloric acid
- Test tubes
- Wooden splints
- Rubber corks
- Access & Learn Chemistry Learner's Book Grade 10 pg. 170
- Dilute sulphuric acid
- Magnesium ribbon
- Delivery tubes

- Practical assessment - Observation - Written exercises

Physical Chemistry

Acids and Bases - Reaction of acids with carbonates
Acids and Bases - Reaction of acids with hydrogen carbonates

By the end of the lesson, the learner should be able to:
- Describe reactions of acids with carbonates
- Carry out experiments on acid-carbonate reactions
- Relate the reaction to effervescence in baking and antacid tablets

In groups, learners are guided to:
- Add dilute hydrochloric acid to sodium carbonate
- Observe effervescence and collect gas produced
- Test gas using calcium hydroxide (limewater)
- Write balanced equations for the reactions

What gas is produced when acids react with carbonates?

- Chemistry Learner's Book Grade 10 pg. 170
- Sodium carbonate
- Dilute hydrochloric acid
- Calcium hydroxide
- Delivery tubes
- Test tubes
- Access & Learn Chemistry Learner's Book Grade 10 pg. 171
- Sodium hydrogen carbonate
- Dilute nitric (V) acid
- Test tubes
- Delivery tubes

- Practical assessment - Observation - Written exercises

Physical Chemistry

Acids and Bases - Reaction of acids with metal oxides
Acids and Bases - Reaction of acids with metal hydroxides

By the end of the lesson, the learner should be able to:
- Explain neutralisation reactions involving metal oxides
- Carry out experiments on acid-metal oxide reactions
- Relate neutralisation to treatment of acidic soils in agriculture
- Describe reactions of acids with metal hydroxides
- Demonstrate neutralisation using indicators
- Connect neutralisation to antacid medication for treating stomach acidity

In groups, learners are guided to:
- Warm dilute nitric (V) acid and add magnesium oxide
- Test the resulting solution using pH paper
- Record observations and determine nature of solution
- Write balanced equations for the reactions
- Add dilute sulphuric (VI) acid to sodium hydroxide with phenolphthalein
- Observe colour change from pink to colourless
- Write balanced equations for the neutralisation reaction

What is a neutralisation reaction?
How do indicators show the end point of neutralisation?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 172
- Magnesium oxide
- Dilute nitric (V) acid
- pH paper
- Beakers
- Bunsen burner
- Access & Learn Chemistry Learner's Book Grade 10 pg. 173
- Sodium hydroxide solution
- Dilute sulphuric (VI) acid
- Phenolphthalein indicator
- Beakers
- Measuring cylinders

- Practical assessment - Observation - Written exercises
- Practical assessment - Oral questions - Written assignments

Physical Chemistry

Acids and Bases - Universal indicator and pH scale

By the end of the lesson, the learner should be able to:
- Explain the pH scale and its use
- Determine pH values using universal indicator
- Relate pH values to water quality testing and swimming pool maintenance

In groups, learners are guided to:
- Prepare solutions of various acids and bases
- Add universal indicator to each solution
- Compare colours with pH scale chart
- Record pH values and classify solutions

What does the pH scale measure?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 175
- Universal indicator
- pH scale chart
- Various acid and base solutions
- Test tubes
- Droppers

- Practical assessment - Observation - Written exercises

Physical Chemistry

Acids and Bases - Strong and weak acids

By the end of the lesson, the learner should be able to:
- Differentiate between strong and weak acids
- Classify acids based on their pH values
- Connect acid strength to battery acid (strong) versus citrus fruits (weak)

In groups, learners are guided to:
- Test 0.1 M hydrochloric acid and 0.1 M ethanoic acid using universal indicator
- Compare pH values of strong and weak acids
- Discuss degree of dissociation in strong and weak acids

Why do strong acids have lower pH values than weak acids?

- Chemistry Learner's Book Grade 10 pg. 175
- 0.1 M hydrochloric acid
- 0.1 M ethanoic acid
- Universal indicator
- pH scale chart
- Test tubes

- Practical assessment - Oral questions - Written exercises

Physical Chemistry

Acids and Bases - Strong and weak bases

By the end of the lesson, the learner should be able to:
- Differentiate between strong and weak bases
- Classify bases based on their pH values
- Relate base strength to drain cleaners (strong) versus baking soda (weak)

In groups, learners are guided to:
- Test 0.1 M sodium hydroxide and 0.1 M ammonium hydroxide using universal indicator
- Compare pH values of strong and weak bases
- Discuss characteristics of strong and weak bases

How can strong and weak bases be distinguished?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 176
- 0.1 M sodium hydroxide
- 0.1 M ammonium hydroxide
- Universal indicator
- pH scale chart
- Test tubes

- Practical assessment - Observation - Written assignments

Physical Chemistry

Acids and Bases - Electrical conductivity of acids and bases
Acids and Bases - Uses of acids in day-to-day life

By the end of the lesson, the learner should be able to:
- Compare electrical conductivity of strong and weak acids and bases
- Set up circuits to test conductivity
- Connect conductivity to car battery technology and industrial electrochemistry
- Outline the uses of acids in various sectors
- Search for information on industrial applications of acids
- Relate acids to food preservation, fertiliser production and metal cleaning

In groups, learners are guided to:
- Set up electrical circuits with bulb, dry cell and electrodes
- Test conductivity of strong and weak acids and bases
- Compare brightness of bulb in different solutions
- Record and discuss observations
- Search for information on uses of acids using print or digital materials
- Discuss uses in food industry, manufacturing and cleaning
- Prepare charts showing applications of acids

Why do strong acids and bases conduct electricity better than weak ones?
How are acids useful in our daily lives?

- Chemistry Learner's Book Grade 10 pg. 176
- Dry cells
- Bulbs with holders
- Connecting wires
- Nails/electrodes
- Various acid and base solutions
- Access & Learn Chemistry Learner's Book Grade 10 pg. 178
- Digital devices
- Reference books
- Chart papers
- Markers

- Practical assessment - Oral questions - Written exercises
- Oral questions - Written assignments - Project assessment

Physical Chemistry

Acids and Bases - Uses of bases in day-to-day life
Introduction to Salts - Meaning and formation of salts

By the end of the lesson, the learner should be able to:
- Outline the uses of bases in various sectors
- Identify applications of bases in agriculture and construction
- Connect bases to soap making, cement production and soil treatment

In groups, learners are guided to:
- Discuss uses of bases in cleaning, food industry and construction
- Carry out soil pH testing activity
- Discuss role of calcium oxide in neutralising acidic soils
- Make natural citrus cleaner using vinegar and citrus peels

How are bases applied in agriculture and industry?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 179
- Soil samples
- pH paper
- Litmus paper
- Vinegar
- Citrus peels
- Digital resources
- Access & Learn Chemistry Learner's Book Grade 10 pg. 181
- Samples of salts (sodium chloride, copper sulphate)
- Charts showing neutralisation equations

- Practical assessment - Oral questions - Written exercises

Physical Chemistry

Introduction to Salts - Normal salts
Introduction to Salts - Acid salts

By the end of the lesson, the learner should be able to:
- Describe normal salts and their properties
- Identify examples of normal salts
- Connect normal salts to common table salt and fertilisers like potassium nitrate

In groups, learners are guided to:
- Discuss characteristics of normal salts (no replaceable hydrogen, pH of 7)
- Identify cations and anions in normal salts
- Write formulae of normal salts (NaCl, KNO₃, CaSO₄)
- Test solutions of normal salts with litmus paper

What are normal salts and their characteristics?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 182
- Samples of normal salts
- Litmus paper
- Test tubes
- Distilled water
- Access & Learn Chemistry Learner's Book Grade 10 pg. 183
- Sodium hydrogen carbonate
- pH paper

- Oral questions - Written exercises - Practical assessment

Physical Chemistry

Introduction to Salts - Basic and double salts
Introduction to Salts - Soluble and insoluble salts

By the end of the lesson, the learner should be able to:
- Describe basic salts and double salts
- Identify examples of basic and double salts
- Connect double salts to alum used in water purification and dyeing

In groups, learners are guided to:
- Discuss characteristics of basic salts (contain hydroxide ions, pH greater than 7)
- Discuss double salts (two different cations or anions)
- Write formulae of double salts
- Categorise provided salt samples into types

What distinguishes basic salts and double salts from other types?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 184
- Samples of basic and double salts
- Potassium aluminium sulphate (alum)
- Litmus paper
- pH paper
- Access & Learn Chemistry Learner's Book Grade 10 pg. 185
- Copper (II) sulphate
- Copper (II) carbonate
- Distilled water
- Beakers
- Bunsen burner

- Oral questions - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Solubility rules
Introduction to Salts - Preparation by direct synthesis
Introduction to Salts - Preparation using acid and metal
Introduction to Salts - Preparation using acid and metal oxide

By the end of the lesson, the learner should be able to:
- State solubility rules for common salts
- Apply solubility rules to predict salt solubility
- Connect solubility rules to choosing appropriate chemicals for water softening
- Describe preparation of soluble salts using acid and metal
- Prepare zinc chloride from zinc and hydrochloric acid
- Connect this method to production of hydrogen gas for industrial use

In groups, learners are guided to:
- Study the solubility table for chlorides, nitrates, sulphates and carbonates
- Discuss exceptions to solubility rules
- Practise predicting solubility of given salts
- Test predictions experimentally
- Add zinc powder to dilute hydrochloric acid until excess
- Test gas produced with burning splint
- Filter to obtain filtrate
- Evaporate to saturation and crystallise

What rules govern the solubility of salts?
Why is the metal added in excess when preparing salts?

- Chemistry Learner's Book Grade 10 pg. 185
- Solubility table charts
- Various salt samples
- Distilled water
- Test tubes
- Digital resources
- Access & Learn Chemistry Learner's Book Grade 10 pg. 186
- Copper metal
- Sulphur powder
- Crucible
- Bunsen burner
- Tripod stand
- Access & Learn Chemistry Learner's Book Grade 10 pg. 187
- Zinc powder
- Dilute hydrochloric acid
- Filter funnel and paper
- Evaporating dish
- Bunsen burner
- Access & Learn Chemistry Learner's Book Grade 10 pg. 188
- Copper (II) oxide
- Dilute nitric (V) acid
- Beakers

- Oral questions - Written exercises - Practical assessment
- Practical assessment - Oral questions - Written assignments

Physical Chemistry

Introduction to Salts - Preparation using acid and alkali (titration)

By the end of the lesson, the learner should be able to:
- Describe preparation of salts using acid and alkali
- Carry out titration using phenolphthalein indicator
- Connect titration to quality control in food and pharmaceutical industries

In groups, learners are guided to:
- Measure sodium hydroxide into conical flask and add phenolphthalein
- Fill burette with dilute hydrochloric acid
- Titrate until colour changes from pink to colourless
- Evaporate and crystallise to obtain sodium chloride

How does phenolphthalein indicate the end point of neutralisation?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 190
- Sodium hydroxide solution
- Dilute hydrochloric acid
- Phenolphthalein
- Burette and stand
- Conical flask

- Practical assessment - Oral questions - Written exercises

Physical Chemistry

Introduction to Salts - Preparation using acid and carbonate

By the end of the lesson, the learner should be able to:
- Describe preparation of salts using acid and carbonate
- Prepare sodium nitrate from sodium carbonate and nitric acid
- Relate effervescence to carbon dioxide fire extinguishers

In groups, learners are guided to:
- Add sodium carbonate to dilute nitric (V) acid until no more gas bubbles
- Test gas with calcium hydroxide
- Filter, evaporate and crystallise
- Write balanced equation for the reaction

How can you tell when the reaction between acid and carbonate is complete?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 191
- Sodium carbonate
- Dilute nitric (V) acid
- Calcium hydroxide
- Filter funnel
- Evaporating dish

- Practical assessment - Observation - Written assignments

Physical Chemistry

Introduction to Salts - Preparation by precipitation (double decomposition)

By the end of the lesson, the learner should be able to:
- Describe preparation of insoluble salts by precipitation
- Prepare lead (II) sulphate by double decomposition
- Connect precipitation to water treatment and removal of heavy metals

In groups, learners are guided to:
- Mix zinc sulphate solution with lead nitrate solution
- Observe precipitate formation
- Filter, wash and dry the precipitate
- Write ionic equations for precipitation reactions

What is double decomposition and how is it used to prepare insoluble salts?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 193
- Zinc sulphate solution
- Lead nitrate solution
- Filter funnel and paper
- Beakers
- Distilled water

- Practical assessment - Oral questions - Written exercises

Physical Chemistry

Introduction to Salts - Hygroscopic, deliquescent and efflorescent salts
Introduction to Salts - Uses of salts and environmental impact of fertilisers

By the end of the lesson, the learner should be able to:
- Describe behaviour of salts when exposed to atmosphere
- Carry out experiments to investigate salt behaviour in air
- Connect hygroscopic salts to silica gel sachets used to keep products dry
- Outline applications of salts in various sectors
- Discuss effects of inorganic fertilisers on the environment
- Relate salts to food preservation, agriculture and water pollution from fertiliser runoff

In groups, learners are guided to:
- Place samples of different salts on watch glasses
- Leave uncovered for 24 hours
- Observe and record changes in appearance
- Classify salts as hygroscopic, deliquescent or efflorescent
- Search for uses of salts in agriculture, medicine, food and glass industries
- Discuss positive and negative effects of inorganic fertilisers
- Discuss eutrophication and mitigation measures
- Present findings on sustainable use of fertilisers

How do salts behave when exposed to air?
How do salts contribute to agriculture and what are the environmental concerns?

- Access & Learn Chemistry Learner's Book Grade 10 pg. 196
- Iron (III) chloride
- Anhydrous copper (II) sulphate
- Sodium carbonate decahydrate
- Watch glasses
- Access & Learn Chemistry Learner's Book Grade 10 pg. 197
- Samples of inorganic fertilisers
- Digital devices
- Reference books
- Charts on eutrophication

- Practical assessment - Observation - Written exercises
- Oral questions - Written assignments - Project assessment