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Air and Atmosphere — Flashcards

ICSE · Class 7 · Chemistry

48 flashcards for Air and Atmosphere (ICSE Class 7 Chemistry) to test yourself on key terms and facts. Sample: "What is air?"

42 questions48 flashcards5 concepts

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48 Flashcards·
Air as a mixtureConstituents of airOxygen in airLavoisier experimentDiscovery of oxygen
Card 1Air as a mixture

What is air?

Answer

Air is a mixture of gases, not a compound. It contains nitrogen, oxygen, carbon dioxide, water vapour, inert gases, and small impurities like dust and smoke.

Card 2Air as a mixture

Why is air considered a mixture and not a compound?

Answer

Air has no fixed composition, the gases keep their own properties, liquid air has no definite boiling point, and the gases can be separated by physical methods.

Card 3Constituents of air

What are the main gases in air by volume?

Answer

Nitrogen is about 78% and oxygen is about 21% by volume. The ratio of nitrogen to oxygen is 4:1 by volume.

Card 4Oxygen in air

Why did the candle in a closed jar go out after some time?

Answer

The candle used up the oxygen in the jar. Oxygen supports burning, so when the oxygen got finished, the flame went out.

Card 5Lavoisier experiment

What happened to the mercury level in Lavoisier’s bell jar experiment?

Answer

The mercury level rose by 1/5th of the total volume of the bell jar. This showed that 1/5th of air is active gas, oxygen.

Card 6Lavoisier experiment

Write the balanced equation for the mercury oxidation reaction in Lavoisier’s experiment.

Answer

2Hg + O2 --heat--> 2HgO. Mercury combines with oxygen on heating to form mercury(II) oxide.

Card 7Lavoisier experiment

Write the balanced equation for mercury oxide decomposition.

Answer

2HgO --heat--> 2Hg + O2. On heating, mercury(II) oxide breaks down to give mercury and oxygen.

Card 8Discovery of oxygen

Who first discovered oxygen, and how was it obtained?

Answer

Joseph Priestley first discovered oxygen in 1774 by heating mercury(II) oxide. He named it active air.

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Frequently Asked Questions

What are the important topics in Air and Atmosphere for ICSE Class 7 Chemistry?
Key topics in Air and Atmosphere include Air as a Mixture, Main Gases in Air, Discovery and Preparation of Oxygen, Properties and Uses of Oxygen. Study these first, then practise questions on each for Class 7 exams.
How many flashcards are available for Air and Atmosphere?
There are 48 flashcards for Air and Atmosphere covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Air and Atmosphere for Class 7 exams?
Learn the core ideas first, then work through the 42 practice questions on Air and Atmosphere. Revise 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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