SHS3 Chemistry · Semester 1, Week 16
Equilibria
Lesson notes
Learning Objectives
Indicator: 3.1.2.LI.4 - Explain qualitatively and quantitatively the operations of electrolytic cell as well as their applications in everyday life.
By the end of the lesson, learners can:
- Describe the essential components of an electrolytic cell (electrolyte, electrodes, external power source) and explain the role of each component using a labelled diagram.
- Explain the process of electrolysis in molten salts, dilute aqueous solutions and concentrated aqueous solutions, predicting the products formed at each electrode.
- State and apply the factors that influence selective discharge of ions at electrodes during electrolysis.
- Apply Faraday’s laws of electrolysis to calculate the mass of substance deposited or volume of gas liberated during electrolysis.
- Discuss at least three practical applications of electrolysis in everyday life, including electroplating and the extraction of aluminium, and evaluate the environmental impact of illegal mining in Ghana.
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Sign in with phone numberCurriculum details
- Strand
- Physical Chemistry (Strand 1)
- Sub-strand
- Equilibria (1.2)
- Content standard
- 3.1.2.CS.4 - Demonstrate knowledge and understanding of redox and apply its principles to electrochemical cells as well as their importance in everyday life. 3.1.2.LO.1 Use the knowledge in pH to distinguish between solutions that are acidic, neutral or basic. 5 Gender Equality and Social Inclusion 6 Socio-Emotional Learning 3.1.2.LO.2 Use your knowledge and understanding of concepts in hydration and hydrolysis to determine the types of salts. 3.1.2.LO.3 Use the understanding of hydrolysis of salts to decide on suitable indicator as well as plot and interpret titration curves. 3.1.2.LO.4 Describe oxidation and reduction reactions and apply their principles to electrochemical cells as well as their importance in everyday life.
- Indicator
- 3.1.2.LI.4 - Explain qualitatively and quantitatively the operations of electrolytic cell as well as their applications in everyday life.
- Suggested placement
-
Semester 1, Week 16
(Week 16 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
- Curriculum reference
- NaCCA curriculum document, p. 102
Exemplars (from the NaCCA curriculum)
Collaborative Learning: In small mixed-ability groups, describe using a diagram or simulations the essential components of an electrolytic cell. Activity-Based Learning: Use role-play to illustrate the two main transactions that occur at the bank (depositing and crediting), link them to the parts and functions of the components of electrolytic cells and describe how currents flow in an electrolytic cell. Talk for Learning: - Discuss the factors that influence the selective discharge of species at the electrodes during electrolysis. - Describe and predict the product of electrolysis of molten salts, dilute salt solution and concentrated salt solution (using inert and active electrode). Inquiry-Based Learning: Using circus activity, - Design and perform experiment to investigate electrolysis of various aqueous solutions in the laboratory. - Design and perform experiment to demonstrate electroplating as application of electrolysis. Talk for Learning: - Discuss extraction of aluminium and gold as application of electrolysis and the effect of illegal mining on the environment. - Discuss Faraday's laws of electrolysis and perform calculations based on the laws. Teaching and Learning Materials: - * Test tubes in a rack * Strips of copper foil * Strips of zinc foil * * 0.1M potassium bromide - Strip of silver wire * * ICT tools Emery paper * * Calculator 0.5 M copper sulphate solution * 0.5 M zinc sulphate solution - * 0.1 M silver nitrate solution * 50 ml Burettes * 25 ml pipettes * 250 ml conical flasks * 100 ml beakers * White tiles - * Retort stands * solution - KMnO 4 * * 0.02M potassium Iron (II) solution * manganate (VII) Iodine solution * Potassium iodide * Na S O 2 2 3 * Starch * * Electrolysis cell Test tubes * Test tube rack - * Copper powder * Zinc powder * * Clamps and stands Bromine water * * Cover slides 0.1 M potassium iodide solution * 0.1 M potassium chloride solution - * 0.1 M Iron (III) chloride - * Power pack - * Connecting wires and clips - * Wooden splint * Droppers * 1 M tetraoxosulphate (VI) acid * 1 M sodium chloride solution - * 1 M copper(II) chloride * Identical fresh nails * Test tube in test tube racks * Stoppers * Spatula * PH sensor * Temperature sensor * Stands and clamps - * Calcium chloride * Oil * Iron coated with zinc * Iron coated with tin * Iron filings * Salt Assessment (3.1.2.AS.4). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.