Physical Chemistry

Acids and Bases - Definition and Examples of Acids
Acids and Bases - Dissociation of Acids in Water

By the end of the lesson, the learner should be able to:
- Define acids
- Identify common acids and their sources
- Show interest in learning about acids

In groups, learners are guided to:
- Discuss with peers the meaning of acids
- Identify common acids found at home and in the laboratory
- Research on natural sources of acids

What are acids and where are they found?

- Chemistry Learner's Book
- Digital devices
- Samples of common acids
- Charts showing acids
- Laboratory equipment
- Dilute acids
- Conductivity apparatus

- Oral questions - Written exercises - Observation

Physical Chemistry

Acids and Bases - Physical Properties of Acids
Acids and Bases - Reaction of Acids with Metals

By the end of the lesson, the learner should be able to:
- Describe physical properties of acids
- Identify acids by their taste (sour)
- Observe safety when handling acids

In groups, learners are guided to:
- Discuss physical properties of acids
- Research on why acids taste sour
- Investigate the corrosive nature of acids

What are the physical properties of acids?

- Chemistry Learner's Book
- Digital devices
- Charts showing acid properties
- Safety equipment
- Laboratory equipment
- Dilute acids
- Metal samples (Mg, Zn, Fe)

- Oral questions - Written exercises - Observation

Physical Chemistry

Acids and Bases - Reaction of Acids with Carbonates
Acids and Bases - Reaction of Acids with Hydrogen Carbonates
Acids and Bases - Reaction of Acids with Metal Oxides

By the end of the lesson, the learner should be able to:
- Describe the reaction of acids with carbonates
- Write equations for reactions of acids with carbonates
- Collect and test for carbon dioxide gas
- Describe the reaction of acids with hydrogen carbonates
- Write equations for reactions of acids with hydrogen carbonates
- Compare reactions of carbonates and hydrogen carbonates

In groups, learners are guided to:
- Carry out experiments on reactions of acids with carbonates
- Collect and test for the gas produced using lime water
- Write balanced equations for the reactions
- Carry out experiments on reactions of acids with hydrogen carbonates
- Collect and test for the gas produced
- Write balanced equations for the reactions

How do acids react with carbonates?
How do acids react with hydrogen carbonates?

- Chemistry Learner's Book
- Laboratory equipment
- Dilute acids
- Sodium carbonate, calcium carbonate
- Chemistry Learner's Book
- Laboratory equipment
- Dilute acids
- Sodium hydrogen carbonate
- Metal oxides (CuO, MgO)

- Practical assessment - Written exercises - Observation

Physical Chemistry

Acids and Bases - Reaction of Acids with Hydroxides

By the end of the lesson, the learner should be able to:
- Describe the reaction of acids with hydroxides
- Write equations for neutralisation reactions
- Appreciate the importance of neutralisation

In groups, learners are guided to:
- Perform experiments to investigate reactions of acids and bases with metal hydroxides
- Carry out neutralisation reactions
- Write balanced equations for the reactions

How do acids react with metal hydroxides?

- Chemistry Learner's Book
- Laboratory equipment
- Dilute acids
- Sodium hydroxide solution

- Practical assessment - Written exercises - Observation

Physical Chemistry

Acids and Bases - Definition and Examples of Bases

By the end of the lesson, the learner should be able to:
- Define bases and alkalis
- Distinguish between bases and alkalis
- Identify common bases and their sources

In groups, learners are guided to:
- Discuss with peers the meaning of bases and alkalis
- Identify common bases found at home and in the laboratory
- Research on natural sources of bases

What are bases and how do they differ from alkalis?

- Chemistry Learner's Book
- Digital devices
- Samples of common bases
- Charts showing bases

- Oral questions - Written exercises - Observation

Physical Chemistry

Acids and Bases - Dissociation of Bases in Water

By the end of the lesson, the learner should be able to:
- Explain the dissociation of bases in water
- Write dissociation equations for common bases
- Relate basicity to hydroxide ion concentration

In groups, learners are guided to:
- Carry out experiments to demonstrate dissociation of bases in water
- Discuss the role of hydroxide ions in basicity
- Write dissociation equations for NaOH, KOH, and NH₃

How do bases behave when dissolved in water?

- Chemistry Learner's Book
- Laboratory equipment
- Alkali solutions
- Conductivity apparatus

- Practical assessment - Written exercises - Oral questions

Physical Chemistry

Acids and Bases - Acid-Base Indicators

By the end of the lesson, the learner should be able to:
- Define indicators
- Identify common acid-base indicators
- Use indicators to test for acids and bases

In groups, learners are guided to:
- Conduct experiments to determine strength of acids and bases using indicators
- Test solutions with litmus, phenolphthalein, and methyl orange
- Record colour changes in different solutions

What are indicators and how do they work?

- Chemistry Learner's Book
- Laboratory equipment
- Various indicators
- Acid and base solutions

- Practical assessment - Written exercises - Observation

Physical Chemistry

Acids and Bases - Universal Indicator and pH Scale
Acids and Bases - Strong and Weak Acids

By the end of the lesson, the learner should be able to:
- Explain the pH scale
- Use universal indicator to determine pH
- Relate pH values to acidity and basicity
- Distinguish between strong and weak acids
- Compare pH values of strong and weak acids
- Relate strength to degree of dissociation

In groups, learners are guided to:
- Discuss the pH scale and its range
- Use universal indicator to test various solutions
- Match pH values with colours on the pH chart
- Compare pH values of hydrochloric acid and ethanoic acid of same concentration
- Carry out activities to compare electrical conductivity
- Discuss the degree of dissociation in strong and weak acids

What is the pH scale and how is it used?
What is the difference between strong and weak acids?

- Chemistry Learner's Book
- Universal indicator
- pH chart
- Various solutions
- Chemistry Learner's Book
- Laboratory equipment
- HCl and CH₃COOH solutions
- Conductivity apparatus

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

Physical Chemistry

Acids and Bases - Strong and Weak Acids

By the end of the lesson, the learner should be able to:
- Distinguish between strong and weak acids
- Compare pH values of strong and weak acids
- Relate strength to degree of dissociation

In groups, learners are guided to:
- Compare pH values of hydrochloric acid and ethanoic acid of same concentration
- Carry out activities to compare electrical conductivity
- Discuss the degree of dissociation in strong and weak acids

What is the difference between strong and weak acids?

- Chemistry Learner's Book
- Laboratory equipment
- HCl and CH₃COOH solutions
- Conductivity apparatus

- Practical assessment - Written exercises - Oral questions

Physical Chemistry

Acids and Bases - Strong and Weak Bases

By the end of the lesson, the learner should be able to:
- Distinguish between strong and weak bases
- Compare pH values of strong and weak bases
- Relate strength to degree of dissociation

In groups, learners are guided to:
- Compare pH values of sodium hydroxide and ammonia solution of same concentration
- Carry out activities to compare electrical conductivity
- Discuss the degree of dissociation in strong and weak bases

What is the difference between strong and weak bases?

- Chemistry Learner's Book
- Laboratory equipment
- NaOH and NH₃ solutions
- Conductivity apparatus

- Practical assessment - Written exercises - Oral questions

Physical Chemistry

Acids and Bases - Uses of Acids and Bases in Daily Life

By the end of the lesson, the learner should be able to:
- Outline uses of acids and bases in daily life
- Relate properties of acids and bases to their applications
- Appreciate the importance of acids and bases

In groups, learners are guided to:
- Search for information on applications of acids and bases
- Discuss uses in food, medicine, cleaning, and industry
- Properly dispose of waste after experiments

How are acids and bases used in daily life?

- Chemistry Learner's Book
- Digital devices
- Charts showing applications
- Internet access

- Oral questions - Written exercises - Group presentations

Physical Chemistry

Introduction to Salts - Meaning and Examples of Salts
Introduction to Salts - Normal Salts
Introduction to Salts - Acidic Salts
Introduction to Salts - Basic and Double Salts

By the end of the lesson, the learner should be able to:
- Define the term salt
- Identify examples of salts
- Show interest in learning about salts
- Define acidic salts
- Give examples of acidic salts
- Explain the formation of acidic salts

In groups, learners are guided to:
- Brainstorm and carry out activities to establish the meaning of salt
- Identify samples of salts at home and in the laboratory
- Discuss common examples of salts
- Discuss with peers the meaning of acidic salts
- Identify examples of acidic salts
- Write equations showing formation of acidic salts

What are salts and where are they found?
What are acidic salts and how are they formed?

- Chemistry Learner's Book
- Samples of salts (table salt, fertilisers)
- Digital devices
- Charts showing salts
- Samples of normal salts
- Periodic table
- Chemistry Learner's Book
- Digital devices
- Charts showing salt types
- Internet access

- Oral questions - Written exercises - Observation
- Oral questions - Written exercises - Group discussions

Physical Chemistry

Introduction to Salts - Solubility of Chlorides and Nitrates

By the end of the lesson, the learner should be able to:
- Determine solubility of chlorides and nitrates in water
- Classify chlorides and nitrates as soluble or insoluble
- Show interest in investigating salt properties

In groups, learners are guided to:
- Carry out experiments to determine solubility of chlorides in water
- Test solubility of various nitrates
- Record and classify results

Are all chlorides and nitrates soluble in water?

- Chemistry Learner's Book
- Laboratory equipment
- Various chlorides and nitrates
- Distilled water

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Solubility of Sulphates and Carbonates
Introduction to Salts - Direct Synthesis

By the end of the lesson, the learner should be able to:
- Determine solubility of sulphates and carbonates in water
- Classify sulphates and carbonates as soluble or insoluble
- Apply solubility rules to predict salt solubility

In groups, learners are guided to:
- Carry out experiments to determine solubility of sulphates in water
- Test solubility of various carbonates
- Create a solubility table for common salts

Which sulphates and carbonates are soluble in water?

- Chemistry Learner's Book
- Laboratory equipment
- Various sulphates and carbonates
- Distilled water
- Iron filings
- Chlorine gas

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Reaction of Acids with Metals

By the end of the lesson, the learner should be able to:
- Prepare salts by reacting acids with metals
- Write equations for the reactions
- Observe safety when handling acids

In groups, learners are guided to:
- Carry out experiments to prepare salts by reacting acids with metals
- React zinc with dilute sulphuric acid
- Write balanced equations for the reactions

How are salts prepared from acids and metals?

- Chemistry Learner's Book
- Laboratory equipment
- Dilute acids
- Metal samples (Zn, Mg)

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Reaction of Acids with Bases (Neutralisation)
Introduction to Salts - Reaction of Acids with Carbonates and Hydrogen Carbonates

By the end of the lesson, the learner should be able to:
- Prepare salts by neutralisation
- Write equations for neutralisation reactions
- Apply titration technique in salt preparation
- Prepare salts by reacting acids with carbonates
- Write equations for the reactions
- Collect and identify products formed

In groups, learners are guided to:
- Carry out experiments to prepare salts by neutralisation
- React dilute acid with alkali using indicator
- Write balanced equations for the reactions
- Carry out experiments to prepare salts from carbonates
- React dilute acid with sodium carbonate
- Write balanced equations for the reactions

How are salts prepared by neutralisation?
How are salts prepared from carbonates and hydrogen carbonates?

- Chemistry Learner's Book
- Laboratory equipment
- Dilute acids
- Alkali solutions
- Chemistry Learner's Book
- Laboratory equipment
- Dilute acids
- Carbonates and hydrogen carbonates

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Precipitation Reactions

By the end of the lesson, the learner should be able to:
- Prepare insoluble salts by precipitation
- Write ionic equations for precipitation reactions
- Apply solubility rules in precipitation

In groups, learners are guided to:
- Carry out experiments to prepare insoluble salts by precipitation
- Mix solutions to form precipitates
- Write balanced ionic equations for precipitation reactions

How are insoluble salts prepared by precipitation?

- Chemistry Learner's Book
- Laboratory equipment
- Soluble salt solutions
- Filter paper and funnel

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Hygroscopic Salts

By the end of the lesson, the learner should be able to:
- Define hygroscopic salts
- Identify examples of hygroscopic salts
- Explain the behaviour of hygroscopic salts in air

In groups, learners are guided to:
- Carry out experiments to investigate behaviour of salts in air
- Expose different salts to atmosphere and observe changes
- Record observations on hygroscopic behaviour

What are hygroscopic salts and how do they behave in air?

- Chemistry Learner's Book
- Laboratory equipment
- Samples of hygroscopic salts
- Watch glasses

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Deliquescent Salts

By the end of the lesson, the learner should be able to:
- Define deliquescent salts
- Identify examples of deliquescent salts
- Distinguish between hygroscopic and deliquescent salts

In groups, learners are guided to:
- Carry out experiments to investigate deliquescent behaviour
- Expose calcium chloride and sodium hydroxide to air
- Compare hygroscopic and deliquescent salts

What are deliquescent salts and how do they differ from hygroscopic salts?

- Chemistry Learner's Book
- Laboratory equipment
- Samples of deliquescent salts
- Watch glasses

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Deliquescent Salts
Introduction to Salts - Efflorescent Salts

By the end of the lesson, the learner should be able to:
- Define deliquescent salts
- Identify examples of deliquescent salts
- Distinguish between hygroscopic and deliquescent salts
- Define efflorescent salts
- Identify examples of efflorescent salts
- Explain the loss of water of crystallisation

In groups, learners are guided to:
- Carry out experiments to investigate deliquescent behaviour
- Expose calcium chloride and sodium hydroxide to air
- Compare hygroscopic and deliquescent salts
- Carry out experiments to investigate efflorescent behaviour
- Expose washing soda to air and observe changes
- Discuss the concept of water of crystallisation

What are deliquescent salts and how do they differ from hygroscopic salts?
What are efflorescent salts and why do they lose water?

- Chemistry Learner's Book
- Laboratory equipment
- Samples of deliquescent salts
- Watch glasses
- Chemistry Learner's Book
- Laboratory equipment
- Washing soda crystals
- Watch glasses

- Practical assessment - Written exercises - Observation

Physical Chemistry

Introduction to Salts - Applications of Salts in Daily Life

By the end of the lesson, the learner should be able to:
- Outline uses of salts in various industries
- Discuss effects of excessive use of inorganic fertilisers
- Appreciate the importance of salts in daily life

In groups, learners are guided to:
- Discuss with peers applications of salts in agriculture, food, medicine, and industry
- Search for information on effects of inorganic fertilisers on environment
- Discuss mitigation measures for environmental challenges

How are salts used in daily life and what are the environmental concerns?

- Chemistry Learner's Book
- Digital devices
- Charts showing salt applications
- Internet access

- Oral questions - Written exercises - Group presentations