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Answer:
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Explanation:
question 1) Standard dry air which is mainly composed of three gases (about 78%)oxygen (about 21%)and argon (1%)together,these three gases make up 99.96% of dry air.
Q2)
answer : Oxygen gas in the atmosphere is essential for respiration.
Q3)
answer : Take a candle and try to burn it in air. Take another candle and try to burn it while keeping it submerged in water. You will observe that,while the candle burns in air,it does not burn in water
Q4
answer : we can show this when air is dissolved in water with the help of following activity: Take some water in a glass or metal container like pan and heat it.Just before water begins to boil,you will notice some bubbles at the inner surface of the pan..... This shows that air dissolved in water.
Q5
answer : A lump of cotton wool has a lot of air trapped inside the space present in its fibres.When this lump of cotton is immersed in water,all the air is replaced by water.Due to this the cotton lump shrinks down
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