Chemistry
"Air is a mixture." Support this statement citing at least three evidences.
Air
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Answer
"Air is a mixture." This statement is supported by following three evidences:
- The composition of air is not fixed. It varies from place to place and from time to time.
- The components of air retain their individual properties.
- No energy exchange occurs when the components of air are mixed with each other.
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(b) Oxygen : What is the percentage proportion of oxygen in air? Why is oxygen called active air?
(c) Carbon dioxide : "Although carbon dioxide plays no role in respiration, all life would come to an end if there is no carbon dioxide in air." Support this statement with relevant facts.
(d) Water vapour : Explain its role in modifying the earth's climate.
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(b) Acid rain
(c) Global warming
(d) Smog
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(a) What are the causes of air pollution?
(b) Suggest five measures to prevent air pollution.