Science and Materials in… · SHS3 General Science

Lesson notes

Learning Objectives

Indicator: 3.1.1.LI.3 - Prepare oxygen and discuss its uses.

By the end of the lesson, learners can:

Describe the physical properties of oxygen gas (colour, odour, solubility in water, density relative to air) based on observations from demonstrations.
Demonstrate, through guided hands-on activity, the laboratory preparation of oxygen gas using hydrogen peroxide and manganese(IV) oxide as catalyst, and describe the method of collection (downward displacement of water).
Write a balanced chemical equation for the decomposition of hydrogen peroxide to produce oxygen gas.
Test for the presence of oxygen gas using a glowing splint and describe the expected observation.
Discuss at least five uses of oxygen in everyday life, including medical, industrial, and environmental applications, and relate these uses to the gas’s properties.

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Curriculum details

Strand: Exploring Materials (Strand 1)
Sub-strand: Science and Materials in Nature (1.1)
Content standard: 3.1.1.CS.1 - Explore the concept of 'Air' as a mixture of useful gases in nature and understand the preparation of oxygen and carbon dioxide and their uses in human life. 3.1.1.LO.1 Explore the composition of air and the laboratory preparation and uses of oxygen and carbon dioxide.
Indicator: 3.1.1.LI.3 - Prepare oxygen and discuss its uses.
Suggested placement: Semester 1, Week 3 (Week 3 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. 91

Exemplars (from the NaCCA curriculum)

Experiential Learning: Put learners in different ability groups, guide them through demonstrations in a laboratory or classroom on how to prepare oxygen gas and discuss its characteristics and uses and also support learners who may react to the environment or materials (allergies).
Teaching and Learning Resources:
- Internet sources such as MOOCs (E.g. https://www.youtube.com/watch?v=4p_aoxLIzs0; https://www.youtube.com/watch?v=eLlRiJPpklM)
- A trough or a big bowl
- Candle
- Matches measuring cylinder
- Plastic bowl/trough
- delivery tubes
- Dilute hydrochloric acid (HCl)
- Calcium Carbonate (CaCO ₃ )/eggshell
- Beakers
- conical flasks
- collecting jars charts
- pictures illustrating that air is a mixture.
- gas jar
- thistle funnels or improvised forms of these materials
- Hydrogen peroxide
- Potassium Chlorate
- delivery tube water trough, etc.
- Requisite glassware and reagents or improvised materials such as jugs,
Assessment (3.1.1.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.