Question

please give the answer ​

Answer 1

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Activity:

Take a candle and fix it on a table. The candle is lighted. The candle will continue to burn due to continuously available fresh air providing the required oxygen for combustion.

Now cover the burning candle by putting an inverted gas jar over it. After a short time, the candle stops burning and gets extinguished. When the burning candle is covered with gas jar, then the candle takes away the oxygen necessary for burning from the air enclosed in the gas jar. After some time, when all the oxygen of air inside the gas jar is used up, then the burning candle gets extinguished. This proves that air is necessary for combustion of substances.

Answer 2

Explanation:

1. First take a tank, and a candle.

2. Lit up the candle and keep it standing inside the tank.

3. Close the mouth of the tank using a lid, such that no air

can get inside

Observations :

After sometime, it is observed that the candle has extinguished

Conclusion :

The air inside the tank was being used by the candle in order to be ignited, when the air, inside the tank, got emptied, there creates a vacuum (no air present), and the

candle got extinguish

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