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Air and Atmosphere

ICSE · Class 6 · Chemistry

Quick revision notes for Air and Atmosphere — ICSE Class 6 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

55 questions30 flashcards4 concepts

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Key Topics to Revise

1

Presence and Properties of Air

  • Air is present everywhere — on land, in water, and in the atmosphere.
  • Air is colourless, odourless, tasteless, and transparent.
  • Air occupies space and has mass.
2

Composition of Air

  • Air is a mixture of gases: 78% nitrogen, 21% oxygen, 0.03–0.04% carbon dioxide, and 0.9% inert gases.
  • Water vapour, dust particles, and pollutants are also present in varying amounts.
  • Oxygen supports burning and respiration; nitrogen dilutes oxygen and prevents rapid burning.
3

Uses of Air Components

  • Oxygen: Used for respiration and burning (combustion).
  • Nitrogen: Used to make proteins in plants, in fertilizers, and for food packaging.
  • Carbon dioxide: Used in photosynthesis, fire extinguishers, and fizzy drinks.
4

Balance of Gases and Natural Processes

  • Respiration and burning use oxygen and release carbon dioxide.
  • Photosynthesis in plants uses CO₂ and releases oxygen, balancing the gases.
  • Photosynthesis occurs only in green plants during daytime using sunlight and chlorophyll.

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Full Notes

Key Concepts

Air is a mixture of gasesOxygen is essential for respirationGreen plants take in carbon dioxideAir pollution occurs when harmful substances

Frequently Asked Questions

What are the important topics in Air and Atmosphere for ICSE Class 6 Chemistry?
Air and Atmosphere covers several key topics that are frequently asked in ICSE Class 6 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 6 Chemistry?
Understand the core concepts first, then work through the 55 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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