Q16 of 25 Page 106

“Is combustion possible without the supply of oxygen?'' Discuss with your teacher

No, combustion is not possible without the supply of oxygen. This can be proved with the help of an activity involving a burning candle.

The activity can be described as follows:


1. A burning candle is put on a table.


2. Candle is covered by a glass tumbler.


We observe that the flame of candle goes off as soon as we cover it with the tumbler. This is because the tumbler cuts off the supply of oxygen and thus flames goes off. This proves that combustion is not possible without the supply of oxygen.


More from this chapter

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14

Let us assume that you are on the moon. If you try to focus sunlight on a paper using magnifying glass, does the paper catch fire? or not? Why?

 15

Can you heat water in a paper vessel? How is it possible?

 17

Explain giving reasons: In which of the following situations water will get heated in a shorter time?

a) Srikar kept water beaker near the wick in the yellow part of a candle flame.


b) Sonu kept water beaker in the outer most part of the flame.

 18

Project work: Collect information about the experiments of Joseph Priestly. Write a two page report describing Priestly’s experiments proving that oxygen is needed for burning.