Page 117 - ICSE Chemistry 6

2. In what ways is oxygen important to us?
3. With the help of an ac vity, show that oxygen supports combus on.
4. How will you show respira on in plants?
5. What is the importance of water vapour in the atmosphere? Where do they come from?

6. Write a note on dust and smoke.
7. What is respira on? Explain the process.
8. Explain the importance of burning with emphasis on fuels like wood, coal, LPG and CNG.

9. How is the composi on of air maintained in nature?
10. What do you mean by air pollu on? What are the causes of air pollu on?
11. What are greenhouse gases? Write a note on global warming.

12. List some measures for reducing air pollu on.

OBSERVE AND PERFORM

Observe the given image carefully and answer the following ques ons.

1. Name the process taking place.

2. Name the gas released.

3. What will you observe?

4. What is the composi on of lime water?

5. Name the compound that turns lime water milky.

6. Name the gas essen al for respira on.

APPLY YOUR LEARNING

A. Sashya was asked to describe air. She wrote the following statement.

‘Air is a compound as it contains many gases.’
The teacher told her that it was an incorrect answer. Iden fy the mistake in the statement and give
reasons for your answer.
B. Why is it advised to wrap anything that catches fi re in a woollen blanket?
C. Carbon dioxide is crucial for sustaining life. Jus fy the statement.
D. Ankit took two candles and covered one of the candles with a beaker. A er some me, he observed
that the covered candle stopped burning. Why do you think it happened?

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