Matter and Its Properties · SHS2 Chemistry

Lesson notes

Learning Objectives

Indicator: 2.1.1.LI.8 - Construct rate equations from experimental data, analyze graphs to deduce the order of reactions and solve problems involving the rate expression.

By the end of the lesson, learners can:

Define rate constant, order of reaction with respect to a particular reactant, and overall order of reaction, and distinguish clearly between these terms.
Deduce the rate expression (rate law) for a reaction from a given set of experimental data using the method of initial rates.
Sketch and analyse concentration-time graphs to identify zero, first, and second order reactions.
Calculate the half-life of a first order reaction and use half-life values to predict the order of a reaction.
Solve problems involving the rate expression, including determining the rate constant with its correct units.

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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.8 - Construct rate equations from experimental data, analyze graphs to deduce the order of reactions and solve problems involving the rate expression.
Suggested placement: Semester 1, Week 8 (Week 8 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 mixed gender group where applicable, distinguish between the terms rate constant and order of reaction with respect to a particular reactant and overall order of reaction.
- Brainstorm to come out with definition of rate determining step.
Problem Solving Approach:
- Deduce the rate expression for a reaction from experimental data. i.e., r=k[A] [B] x y
- Using think-pair-share approach, sketch graphical representation for zero, first and second order reactions.
- Use mathematical skills to solve problems involving the rate of reaction, including half-life of a reaction from first order and its significance as well as using half-life to predict the order of reaction.
Note: Calculations involving the Arrhenius equation and its interpretations are beyond the scope of this curriculum.
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.8). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.