Periodicity · SHS3 Chemistry

Lesson notes

Learning Objectives

Indicator: 3.2.1.LI.1 - State and describe properties of transition elements and perform an experiment to investigate some properties of transition elements.

By the end of the lesson, learners can:

Identify and name the first-row transition elements (Sc to Zn) from the periodic table and state the general electronic configuration of transition elements.
Describe at least five characteristic properties of transition elements: variable oxidation states, paramagnetism, complex ion formation, coloured compound formation, and catalytic ability.
Demonstrate experimentally that manganese(IV) oxide catalyzes the decomposition of hydrogen peroxide, and explain the role of the catalyst in the reaction.
Perform an experiment to show that insoluble copper(II) salts dissolve in excess dilute ammonia due to complex ion formation, and explain what happens.
Construct models of tetrahedral, square planar, and octahedral complex shapes using local materials and name the complexes from their formulae.

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

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.1 - State and describe properties of transition elements and perform an experiment to investigate some properties of transition elements.
Suggested placement: Semester 2, Week 6 (Week 26 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. 106

Exemplars (from the NaCCA curriculum)

Talk for Learning Approach:
- In mixed-ability groups, discuss and list the names of the first-row transition elements and explain what transition elements are.
- Discuss the characteristic properties of transition elements under the following headings: a. Variable oxidation states b. Paramagnetism c. Complex ion formation d. Coloured compounds formation e. Catalytic abilities
Inquiry-Based Activity: Perform simple experiment(s) to show the catalytic behaviour of transition elements using: a. Decomposition of hydrogen peroxide using manganese (IV) oxide as Catalyst b. Any other suitable reagents
Exploratory Learning: Conduct an experiment to explain the applications of complex formation by causing waterinsoluble species to dissolve by converting them into soluble complexes. E.g., insoluble Cu 2+ salt in excess dilute ammonia.
Collaborative Learning
- Discuss and use molecular models or materials from the environment to create shapes of some common complex compounds (tetrahedral, square planar and octahedral) from given formulae.
- Draw and name the complex compounds modelled.
Note: Systematic naming of complexes should be treated.
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.1). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.