1. What are the major constituents of air? Write their significance also.
2. How will you prove that air supports burning?
3. How will you show that air is dissolved in water?
4. How will you prove that air occupy space?
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Answer:
answer 1) :
Constituents of air Uses
Oxygen Necessary for respiration and combustion
CO2 Used by plants to make their foods. Used in fire extinguishers.
N2 Used in Nitrogen fixation by bacteria.
Helium Used for generating lifts in airships.
answer 2):Cover the burning candle with a glass jar. After few minutes the candle is extinguished. As the supply of air is stopped due to glass jar the burning of candle is also stopped. This experiment proves that air supports burning.
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