SHS3 Chemistry · Semester 2 Week 7: Periodicity

Lesson notes

Learning Objectives

Indicator: 3.2.1.LI.2

By the end of the lesson, learners can:

Compare and contrast at least five physical and chemical properties of transition metals with those of main group metals, using correct scientific terminology.
Predict and explain why transition metals form variable oxidation states, coloured compounds, and complex ions while main group metals do not.
Analyse the catalytic properties of transition metals and explain how these properties are applied in industrial processes.
Evaluate the everyday uses of at least five transition metals (iron, copper, gold, nickel, cobalt, etc.) in Ghanaian and global contexts.
Justify, with evidence, why transition metals are preferred over main group metals for specific applications in tools, wiring, construction, and technology.

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Curriculum details

Strand: Systematic Chemistry of the Elements (Strand 2)
Sub-strand: Periodicity (2.1)
Content standard: 3.2.1.CS.1 - Demonstrate knowledge and understanding of the pattern of physical and chemical properties of the transition elements as well as their uses. Recognize the colour production, catalytic properties and many applications of transition elements. 3.2.1.LO.1 Predict and describe the physical and chemical properties of the transition elements as well as their uses in everyday life.
Indicator: 3.2.1.LI.2 - Outline the similarities and differences between transition metals and main group metals and everyday uses of transition metals.
Suggested placement: Semester 2, Week 7 (Week 27 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. 107

Exemplars (from the NaCCA curriculum)

Collaborative Learning:
- In mixed ability groups, brainstorm to come out with the similarities and differences between transition metals and main group metals in terms of: a. Hardness b. Reaction with water and acids c. Variable oxidation states d. Complex ion formation e. Coloured compounds formation f. Catalytic properties
- In mixed-ability groups, discuss the uses of transition metals in everyday life.
Teaching and Learning Materials:
- * Periodic table * Worksheets * * Cobalt (II) tetraoxosulphate (VI) Samples of transition elements; iron, copper, gold, etc. * * Dropper Iron (III) trioxonitrate (V) * * Beakers Sodium thiosulphate solution * * Reagent bottles containing the Nickel (II) tetraoxosulphate (VI) catalyst * * Iodine Copper (II) tetraoxosulphate (VI)
- Catalyst
- * Iron (II) tetraoxosulphate (VI) catalyst
- catalyst Timer/clock
- solutions of the catalysts
- * Potassium iodide solution * KOH
- NaOH
- Silver chloride and ammonia solution
- Water
- from the environment such as styrofoam, wire, paper, beads
Assessment (3.2.1.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.