Matter and Its Properties · SHS2 Chemistry

Lesson notes

Learning Objectives

Indicator: 2.1.1.LI.7 - Describe the collision theory and use it to explain qualitatively, the effects of the factors that affect the rate of reaction.

By the end of the lesson, learners can:

State the three main postulates of the collision theory in their own words.
Explain why not every collision between reactant particles leads to a chemical reaction, using the concepts of activation energy and effective collisions.
Use the collision theory to explain qualitatively how concentration, temperature, surface area, pressure, and catalysts affect the rate of a chemical reaction.
Sketch and interpret the Maxwell-Boltzmann energy distribution curve to show how temperature changes and the addition of a catalyst affect the number of particles with energy equal to or greater than the activation energy.

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Curriculum details

Strand: Physical Chemistry (Strand 1)
Sub-strand: Matter and Its Properties (1.1)
Content standard: 2.1.1.CS.1 - Demonstrate knowledge and understanding that energy changes occur in chemical reactions as a result of reorganization of atoms at different rates. 2.1.1.LO.1 Describe the different energy changes that occur as a result of reorganization of atoms. 3 Gender Equality and Social Inclusion 4 Socio-Emotional Learning 2.1.1.LO.2 Use the concept of chemical kinetics to explain that chemical reactions proceed at different rates depending on their conditions and design experiment to investigate these conditions.
Indicator: 2.1.1.LI.7 - Describe the collision theory and use it to explain qualitatively, the effects of the factors that affect the rate of reaction.
Suggested placement: Semester 1, Week 7 (Week 7 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. 65

Exemplars (from the NaCCA curriculum)

Collaborative Learning:
- In a class session, brainstorm on the interactions occurring in a chemical reacting system and describe the collision theory.
- Highlight the main points of the collision theory.
Activity-Based Learning:
- Role-play to simulate the collision theory.
- Predict and explain using the collision theory, the qualitative effect of each factor on the rate of reaction.
- Sketch and use the Maxwell-Boltzmann energy distribution curve to explain the effect of temperature change and catalyst on the rate of reactions.
Teaching and Learning Materials:
- * Worksheets: for drawing and labelling enthalpy profile diagram. * Worksheets for supporting calculation of standard enthalpy changes. * Worksheets with task on applying Hess' law to calculate enthalpy of reaction. * Calculator * Hot water * Hydrochloric acid * Sodium hydroxide pellets * Thermometer * Copper sulphate * Zinc powder * Virtual lab on calorimetry * Use of gas syringe * Chemical balance * Calcium chloride
- * Probe
- Beakers (100ml and 400ml)
- Ammonium chloride * Calorimetry setup * Conical flask * Beakers * Marble chips * Hydrochloric acids * Kits for sulphur-clock experiment * Kits for investigating effect of of H O 2 2 * Graph sheets
- WEBSITE
- Videos on the topic:khanacademy.org
- catalyst on decomposition
Assessment (2.1.1.AS.7). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.