SHS2 General Science · Semester 1 Week 2: Science and Materials in Nature

Lesson notes

Learning Objectives

Indicator: 2.1.1.LI.2 - Apply the knowledge of acids and bases in analysing the formation of salts and their uses.

By the end of the lesson, learners can:

Define a salt as a compound formed when an acid reacts with a base or alkali, with water as the other product.
Write balanced word equations for neutralisation reactions between common acids (HCl, H₂SO₄, HNO₃) and bases/alkalis (NaOH, Ca(OH)₂, KOH, CaO).
Conduct a neutralisation reaction using hydrochloric acid and sodium hydroxide, using an indicator to identify the endpoint.
Describe at least four common uses of salts in daily life, linking each use to the specific salt involved.
Predict the salt formed when given the names of an acid and a base, and state the general pattern for naming salts.

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Curriculum details

Strand: Exploring Materials (Strand 1)
Sub-strand: Science and Materials in Nature (1.1)
Content standard: 2.1.1.CS.1 - Demonstrate understanding of liquids in the Lives of humans. 2.1.1.LO.1 Describe the nature and uses of different liquids in the Lives of humans.
Indicator: 2.1.1.LI.2 - Apply the knowledge of acids and bases in analysing the formation of salts and their uses.
Suggested placement: Semester 1, Week 2 (Week 2 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. 64

Exemplars (from the NaCCA curriculum)

Collaborative Learning:
- Provide worksheets as guidelines for groups of learners and supervise them to explore the Level 3 Strategic mixing of acids and bases/alkalis to form salts. Let learners represent the combinations with reasoning equations and cross-share. Using think-pair-share, learners discuss the uses of salts. Pay attention to less assertive and critical thinking and
- other learners who need additional support.
Teaching and Learning Resources:
- Acid (HCl or any suitable one)
- base/Alkali (CaO, Na₂O/Ca(OH)₂,
- NaOH etc) reagents conical flasks
- white tiles
- 250ml beakers
- measuring cylinders
- weighing scale
- indicators
- 1-litre volumetric flasks
- alkali
- mineral acids
- pH scale
- stirrers
- pipettes
- distilled water
Assessment (2.1.1.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.
Extended reasoning