Air and Atmosphere — Chapter Summary
ICSE · Class 7 · Chemistry
Summary of Air and Atmosphere for ICSE Class 7 Chemistry. Key concepts: Air contains different gases, Nitrogen is the main and Oxygen makes up about 21%.
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Overview
Air is a mixture of gases, not a compound. It surrounds the Earth up to about 300 km above the surface and contains nitrogen, oxygen, carbon dioxide, water vapour, inert gases, and impurities. The two main gases are nitrogen and oxygen, which occur in air in a 4:1 ratio by volume. Air is essential f
Key Concepts
Air contains different gases in varying
Air contains different gases in varying amounts. Its composition is not fixed, and its components keep their own properties. Liquid air has no definit
Nitrogen is the main constituent
Nitrogen is the main constituent of air, making up about 78% by volume. It is colourless, odourless, tasteless, slightly lighter than air, and does no
Oxygen makes up about 21%
Oxygen makes up about 21% of air by volume. It is the active part of air, supports respiration and combustion, but does not burn itself. It is only sl
Carbon dioxide is present in
Carbon dioxide is present in a very small amount in air, about 0.03% to 0.04% by volume. It is colourless and odourless, helps in photosynthesis, is u
Water vapour
Water vapour, also called moisture, is present in variable amounts in air. Its amount determines humidity and affects rain, snow, fog, dew, and other
Learning Objectives
- Recall that air is a mixture of gases.
- Identify the main components of air and their proportions.
- Explain the importance of nitrogen, oxygen, carbon dioxide, and water vapour.
- Understand why air supports burning and respiration.
- Describe laboratory preparation of oxygen using potassium chlorate or hydrogen peroxide with manganese dioxide as a catalyst.
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Sources & Official References
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