Chemistry Guides for SS 2 Chemistry and Industries – Electrolysis and Ionic Theory

CHEMISTRY 

THEME – CHEMISTRY AND INDUSTRIES 

TOPIC 1 – ELECTROLYSIS 

INSTRUCTIONAL MATERIALS

1. An electrolytic cell apparatus

2. Hoffman’s voltammeter

3. An electrochemical cell apparatus

4. Copper sulphate solution

5. Dilute H2SO4

6. Brine

LEARNING OBJECTIVES

By the end of the lesson, students should be able to:

1. explain the quantitative aspects of electrolysis.

2. define electrolytes (strong, weak, fused/molten, non electrolytes) electrolytic and electrochemical cells.

3. differentiate between strong and weak electrolytes.

4. illustrate the electrolysis of acidified water, copper II sulphates and brines.

5. identify factors affecting the discharge of ions during electrolysis

6. construct the electrolytic and electrochemical cells.

7. state Faraday’s laws of electrolysis.

8. calculate amount of substances librated or deposited at electrodes during electrolysis.

9. explain the uses of electrolysis in extraction and purification of metals.

CONTENTS OF THE LESSON

FOCUS LESSONS 

1. Meaning of electrolysis

2. Terminologies

• electrodes

• electrolyte

• electrolytic cell

• electrochemical cells, etc.

3. electrolysis of acidified water, copper II sulphates (CuSO4) and brine.

4. Faraday’s laws of electrolysis and the calculations.

5. Uses of electrolysis: purification, extraction and electroplating of metals.

LESSON PRESENTATION

TEACHER’S ACTIVITIES

1. Guides students to:

• define electrolysis

• distinguish between strong and weak electrolytes

• construct electrolytic and electrochemical cells.

2. demonstrates electrolysis of:

• acidified water using Hoffman’s voltammeter

• brine

• copper sulphate.

3. Explain the Faraday’s first and second laws of electrolysis.

4. Demonstrate the uses of electrolysis.

5. Guides students to calculate amount of substances librated or deposited at electrodes during electrolysis.

STUDENT’S ACTIVITIES

1. Listen to teacher’s explanations.

2. Set up an electrolytic cell.

3. Explain the electrolysis of acidified water, copper II sulphates and brine.

4. Describe the principal in the Hoffman’s voltammeter in the electrolysis of acidified water.

5. State Faraday’s first and second laws of electrolysis.

6. Calculate amount of substances discharged during electrolysis.

7. States the uses of electrolysis.

LESSON EVALUATION

Students to,

1. define electrolysis.

2. set up the electrolytic and electrochemical cells.

3. carry out the electrolysis of acidified water.

4. explain the Faraday’s first and second laws of electrolysis.

5. solve problems involving Faraday’s laws of electrolysis.

6. state the uses of electrolysis.

CHEMISTRY 

THEME – CHEMISTRY AND INDUSTRIES 

TOPIC 2 – IONIC THEORY

INSTRUCTIONAL MATERIALS

1. Samples of electrovalent and covalent compounds

2. Apparatus for the electrolysis

3. Samples of weak and strong electrolytes

LEARNING OBJECTIVES – By the end of the lesson, students should be able to:

1. explain the difference between:

• electrovalent and covalent compounds

• electrolytes and non-electrolytes.

2. investigate the movement of ions in solution.

3. distinguish between strong and weak electrolytes.

4. rank and explain the position of ions in the electrochemical series.

5. relate the order of ions in the electrochemical series to their rate of discharge from solution.

6. state the factors affecting the preferential discharge of ions.

CONTENTS OF THE LESSON

FOCUS LESSONS 

1. Electrovalent and covalent compounds.

2. Electrolytes and non-electrolytes.

3. Weak and strong electrolytes.

4. Electrochemical series

5. Factors affecting the preferential discharge of ions

 

LESSON PRESENTATION

TEACHER’S ACTIVITIES

1. Guides students to distinguish between:

• electrovalent and covalent compounds

• electrolytes and non-electrolytes.

2. Demonstrates experiments on:

• movement of ions in solution

• strong and weak electrolytes.

3. Guides students in the discussion of the relationship between the nature of ions and their ranking in the electrochemical series.

4. Explain the factors affecting the preferential discharge of ions in solution.

 STUDENT’S ACTIVITIES

1. Participates in class discussion.

2. Brings samples of electrovalent and covalent compounds

3. Participate in the demonstrations on:

• electrolytes and non- electrolytes

• weak and strong electrolytes.

4. Compiles a list of:

• electrolytes and non-electrolytes

• strong and weak electrolytes.

5. Discuss the factors affecting the preferential discharge of ions.

LESSON EVALUATION

Students to,

1. list 5 electrovalent and covalent compounds respectively.

2. list 3 each of weak and strong electrolytes.

3. give the order of discharge of a given list of ions.

4. state the factors affecting the discharge of ions in solution.