SHS1 Chemistry · Semester 1 Week 14: Matter and Its Properties

Lesson notes

Learning Objectives

Indicator: 1.1.1.LI.4 - Calculate different physical quantities (number of entities, mass and volume) based on the amount of substance.

By the end of the lesson, learners can:

Define the mole as the amount of substance containing 6.02 x 10²³ entities (Avogadro’s constant, L or Nₐ).
Use the relationship n = m/M to calculate the amount of substance (n) in moles when given the mass (m) of a substance and its molar mass (M).
Use the relationship n = N/Nₐ to interconvert between the amount of substance (n) and the number of entities (N), whether atoms, molecules or ions.
Use the relationship n = V/Vm to calculate the volume (V) of a gas at standard temperature and pressure (STP, where molar volume Vm = 22.4 dm³/mol) and at room temperature and pressure (RTP, where Vm = 24 dm³/mol).
Solve combined conversion problems that move between mass, number of entities and volume through the central quantity n, the amount of substance.

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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.4 - Calculate different physical quantities (number of entities, mass and volume) based on the amount of substance.
Suggested placement: Semester 1, Week 14 (Week 14 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. 34

Exemplars (from the NaCCA curriculum)

Problem-Based Approach:
- Describe how the amount of a substance (n) can be used to determine the number of entities (atoms, molecules or ions), mass (m) of a substance, volume (V) of a gas using mathematical equations that represent their interconversions.
- Practice calculations involving the amount of substance, number of entities and molar quantities.
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.4). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.