Equilibria · SHS2 Chemistry

Lesson notes

Learning Objectives

Indicator: 2.1.2.LI.1 - Explain the terms reversible and irreversible reactions and dynamic equilibrium.

By the end of the lesson, learners can:

Distinguish between reversible and irreversible reactions by describing the defining features of each, using correct terminology such as reactants, products, forward reaction and backward reaction.
Investigate the reversible reaction between anhydrous copper (II) tetraoxosulphate (VI) and water through a guided experiment, recording observable evidence of reversibility in both directions.
Explain dynamic equilibrium as the state in which the rate of the forward reaction equals the rate of the backward reaction in a closed system, using a graph of concentration versus time to support the explanation.
Classify given physical, chemical, biological and environmental processes as reversible or irreversible after viewing a video, justifying each classification with a brief reason.
Communicate experimental findings and interpretations of dynamic equilibrium in small groups, respecting diverse viewpoints and contributing ideas clearly.

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Curriculum details

Strand: Physical Chemistry (Strand 1)
Sub-strand: Equilibria (1.2)
Content standard: 2.1.2.CS.1 - Demonstrate understanding that a balance of opposing reactions occur in chemical equilibrium systems to attain equilibrium and this principle is applied in chemical industrial processes. 2.1.2.LO.1 Explain that dynamic equilibrium is attained when the rates of the forward and backward reactions are equal and this principle has industrial applications. 2.1.2.LO.2 Apply your knowledge in acids and bases to classify and describe substances as acids and bases as well as determine the concentration of analyte through titration.
Indicator: 2.1.2.LI.1 - Explain the terms reversible and irreversible reactions and dynamic equilibrium.
Suggested placement: Semester 1, Week 12 (Week 12 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. 69

Exemplars (from the NaCCA curriculum)

Participatory Learning:
- Explain what reversible reactions are after watching a short video of reversible and irreversible reactions and apply them to physical, chemical, biological and environmental processes.
- Use graphical method to explain the concept of dynamic equilibrium.
Exploratory Learning: Conduct an experiment on the reversible reaction between anhydrous copper (II) tetraoxosulphate (VI) and water or any other workable reagent.
Teaching and Learning Materials:
- * Video on the topic. * Worksheet containing tables to be completed on the equilibrium factors. * Worksheet with scaffolding strategies in Kc, Kp and Ksp
- CHARTS * Chart of the production line processes. * Chart of processes that are
- of the Haber and Contact
- reversible
Assessment (2.1.2.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.