Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

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Solution

In glass jar B the candle remains lighted for a longer time as it contains oxygen gas which helps in the combustion of candle but this candle puts off in glass jar A with carbon dioxide gas as it does not help in combustion, so the candle of jar A will flicker out.

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Q. Question 18
Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

(a) What is combustion?

(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

Q. Radhika performed an experiment and wrote a record of what she had done. Can you rewrite these sentences in the correct order to describe her work? Draw a picture of her experiment. Can you explain what she observed?
(a) I used my wrist watch to check how long each candle burned.
(b) In the lid of the first jar, I punched several small holes.
(c) With my older brother's help, I fixed one candle in each jar and lit them.
(d) I collected the following items: two identical jam jars with lids, two identical small candles, matches, a nail and a hammer.
(e) I left the second jar open.
(f) I wanted to compare the time for which the candles could burn in the two jars.
(g) The second candle continued to burn for a long time.
(h) The candle in the first jar went out first and the jar was filled with smoke.
(i) I closed the first jar with its own lid.

Q. In the given image, candles A and B are covered with identical jars. Jars covering A and B are completely filled with air and pure oxygen, respectively. Select the correct statement that corresponds to the given information.

The gas hydrogen and carbon dioxide are placed in two jars . if the lid separating the two jars be removed what will be the constitute in the jar after a few minutes

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