Equilibria

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.4 - Deduce expressions for equilibrium constants in terms of concentrations and partial pressures and perform relevant calculations from appropriate data.

Suggested placement

Semester 1, Week 15 (Week 15 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. 70

Exemplars (from the NaCCA curriculum)

Activity-Based Learning:
- In mixed-ability groups, deduce expression for equilibrium constant using the law of mass action.
- Using the think-pair-share approach, explain the significance of the equilibrium constant.
- Perform calculations to determine equilibrium concentrations or partial pressures and equilibrium constant using experimental data and the initial quantities of reactants.
- Establish the relationship between Kp and Kc using the ideal gas equation.
- Perform calculations involving Ksp of sparingly soluble salts.
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.4). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.