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Air and Atmosphere

ICSE · Class 7 · Chemistry

Quick revision notes for Air and Atmosphere — ICSE Class 7 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

42 questions48 flashcards5 concepts

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Key Topics to Revise

1

1. Air as a Mixture

  • Air extends to about 300 km above the Earth's surface.
  • Air is a mixture, not a compound.
  • Air contains nitrogen, oxygen, carbon dioxide, water vapour, inert gases, dust particles, smoke, and germs.
2

2. Main Gases in Air

  • Nitrogen is the main constituent of air and is slightly lighter than air as a whole.
  • Nitrogen is neither combustible nor a supporter of combustion.
  • Nitrogen is non-poisonous, but animals die in pure nitrogen due to lack of oxygen.
3

3. Discovery and Preparation of Oxygen

  • Oxygen was first discovered by Joseph Priestley in 1774 by heating mercury(II) oxide.
  • Priestley named it active air.
  • Antoine Lavoisier studied the gas in 1789, proved it to be an element, and named it oxygen.
4

4. Properties and Uses of Oxygen

  • Oxygen is a colourless, odourless, tasteless gas.
  • Oxygen is non-poisonous and supports life.
  • Oxygen is slightly heavier than air.

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Full Notes

Key Concepts

Air contains different gases in varyingNitrogen is the main constituentOxygen makes up about 21%Carbon dioxide is present inWater vapour

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.

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