Curriculum
Science — Third Preparatory
Science — Third Preparatory
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Unit 1 — Chemical Reactions and Their Environmental Impacts
Preview- 1.1 Starting point: what is a chemical reaction?
- 1.2 Direct combination reactions
- 1.3 Decomposition reactions
- 1.4 Single replacement reactions
- 1.5 Double replacement reactions
- 1.6 Oxidation–reduction (redox) reactions
- 1.7 Summary of Lesson 1
- 2.1 Why do some things burn easily?
- 2.2 The combustion triangle
- 2.3 Ignition point and flammability
- 2.4 Life application: how a match lights
- 2.5 Combustion of metals and non-metals
- 2.6 Complete and incomplete combustion
- 2.7 Detecting the products of combustion
- 2.8 Properties of the combustion products
- 2.9 Environmental pollution from combustion
- 2.10 Summary of Lesson 2
- 3.1 A behaviour that threatens public health
- 3.2 The tobacco plant and the products of tobacco combustion
- 3.3 What tobacco contains
- 3.4 Harmful effects on health
- 3.5 Environmental damage caused by smoking
- 3.6 Types of smoking and ways of exposure
- 3.7 Preventing smoking: how to say no
- 3.8 Summary of Lesson 3
- 📌 Comprehensive Scientific Terminology Dictionary:
- ⚖️ Governing Physical Laws & Mathematical Relations:
- 🔍 In-Depth Explanations, Deductions & Multi-Book Insights:
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Question bank: Unit 1 — Chemical Reactions and Their Environmental Impacts
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Unit 2 — Electricity and Magnetism
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Question bank: Unit 2 — Electricity and Magnetism
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Unit 3 — Variation of Traits in Living Organisms
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Question bank: Unit 3 — Variation of Traits in Living Organisms
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Unit 4 — Dating Planet Earth
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Question bank: Unit 4 — Dating Planet Earth
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Science — Third Preparatory 2026/2027
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Unit 1 - Force, Motion, Acceleration and Physical Quantities
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Text lesson
Unit 1 — Chemical Reactions and Their Environmental Impacts
Unit 1 — Chemical Reactions and Their Environmental Impacts
2.7 Detecting the products of combustion
2.7 Detecting the products of combustion
- Activity. Burn natural gas (hydrocarbon) in a Bunsen burner and pass the products through an apparatus: first a U-tube surrounded by ice that contains light blue anhydrous cobalt chloride paper, then through clear limewater.
- Observations:
- The ice cools the gases so the water vapour condenses; the blue cobalt chloride paper turns pink, showing that water is formed.
- Limewater turns milky , showing that carbon dioxide is formed.
- So the complete combustion of a hydrocarbon forms water and carbon dioxide, as the equation says.
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