Curriculum
Science — Third Preparatory
Science — Third Preparatory
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Science — Third Preparatory 2026/2027
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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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Unit 2 — Electricity and Magnetism
Preview
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Unit 3 — Variation of Traits in Living Organisms
Preview
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Unit 4 — Dating Planet Earth
Preview
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
2.8 Properties of the combustion products
2.8 Properties of the combustion products
| Product | Formed when | Properties | Effect |
|---|---|---|---|
| Carbon dioxide, CO₂ | Complete combustion of carbon-containing fuel |
|
Greenhouse gas; contributes to global warming |
| Carbon monoxide, CO | Incomplete combustion (lack of oxygen) | Colourless, odourless, toxic | Poisoning; binds haemoglobin |
| Water vapour, H₂O | Burning hydrogen or hydrocarbons | Condenses to droplets when cooled | Harmless in small amounts |
| Carbon (soot), C | Incomplete combustion of hydrocarbons | Fine black solid | Blackens surfaces, harms lungs |
| Sulphur dioxide, SO₂ | Burning fuel with sulphur impurities |
|
Acid rain, respiratory irritation |
| Nitrogen oxides, NOₓ |
|
|
Acid rain, smog, lung irritation |
Equations→S + O₂ → SO₂; 2NO + O₂ → 2NO₂.
- Cross-cutting concept stability and change. In every combustion the substances change but the total mass of products equals the total mass of the reactants (conservation of matter).
- Yet the products can change the environment and human health over time.
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