SHS1 Chemistry · Semester 1 Week 17: Matter and Its Properties

Lesson notes

Learning Objectives

Indicator: 1.1.1.LI.7 - Perform calculations involving stoichiometric relationships.

By the end of the lesson, learners can:

Write balanced chemical equations for given reactions and derive the correct mole ratio for each species involved.
Use mole ratios to calculate the amount of substance (in moles) of reactants and products in a balanced equation.
Calculate the mass, number of entities (atoms, molecules, ions), concentration (g/dm³, mol/dm³, ppm) and volume of gaseous substances in chemical reactions.
Identify the limiting and excess reagents in a reaction by comparing available moles to required moles using the mole ratio.
Calculate the percentage yield of a product given the actual yield and the theoretical yield.

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Curriculum details

Strand: Physical Chemistry (Strand 1)
Sub-strand: Matter and Its Properties (1.1)
Content standard: 1.1.1.CS.2 - Demonstrate an understanding of the mole concept and its significance to the quantitative analysis of chemical reaction. 1.1.1.LO.1 Use the knowledge and understanding of the scientific practices in Chemistry to explain the structure of the atom as well as the stability of its nucleus. 1.1.1.LO.2 Use the mole concept to determine the amount and quantity of various substances involved in chemical reactions. 1.1.1.LO.3 Write mole ratios for chemical equations and apply it in quantitative analysis. 1.1.1.LO.4 Use the kinetic theory of matter to explain the behaviour of solids, liquids and gases under different conditions and describe the laboratory preparation of gases as well as their uses in everyday life.
Indicator: 1.1.1.LI.7 - Perform calculations involving stoichiometric relationships.
Suggested placement: Semester 1, Week 17 (Week 17 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. 36

Exemplars (from the NaCCA curriculum)

Experiential Learning:
- Work in small mixed ability groups to perform experiments on some common reactions in the laboratory.
- Based on the reactants used, write down balanced equations on each of the reactions.
- In pairs or groups, determine the mole ratio of species in each of the chemical reactions.
- Use the mole ratio to calculate the following quantities in chemical reactions: a. Number of entities b. Amount of substance c. Mass of substance d. Concentrations in gdm , moldm and ppm -3 -3 e. Volume of substance
- Determine the limiting and excess reagents in chemical reactions by comparing the available moles of each reactant to the moles required for complete reaction using the mole ratio.
- Work individually to calculate the percentage yield of products.
Teaching and Learning Materials:
- * Worksheets with sample questions * Worksheets to record results. * Na CO 2 3 * CaCl 2 * Bolt and nuts * Resources for measuring volume and preparing solutions * Weighing scale
- * Calculator
- * Periodic table containing the elements with their relative atomic masses * Calculator * Beam balance or diagram of beam balance Substances of different weights
- * Apparatus (beaker, flask, weighing * Worksheet on the of substance and molar * Solid solutes
- Liquid solutes (e.g., water)
- CHARTS * Charts between other quantities
- for preparing solutions funnel, stirrer, volumetric scale), with sample questions interconversion of amount to number of entities quantities. (e.g., NaOH, NaCl) (e.g., HCl) Solvent
- showing interconversion amount of substance and
Assessment (1.1.1.AS.7). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.