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Chapter Summary

Air and Atmosphere

ICSE · Class 7 · Chemistry

Summary of Air and Atmosphere for ICSE Class 7 Chemistry. Key concepts, important points, and chapter overview.

42 questions48 flashcards5 concepts

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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.

Frequently Asked Questions

What are the important topics in Air and Atmosphere for ICSE Class 7 Chemistry?
Air and Atmosphere covers several key topics that are frequently asked in ICSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Air and Atmosphere — ICSE Class 7 Chemistry?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Air and Atmosphere

All 7 chapters — ICSE Class 7 Chemistry Chapter Summary

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