54 Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till it cooled down to room temperature.
(a) Why did the tiny bubbles appeared?

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Solution

In the form of oxygen, the air is dissolved in water. When the air in the water escapes during the boiling process, tiny bubbles form.
As a result of the evolution of air dissolved in water, small bubbles appeared.

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Question 19.1

Paheli kept some water in a beaker for heating. She observed
that tiny bubbles appeared before the water started to boil.
She boiled the water for about 5 minutes and filled it in a
bottle up to the brim and kept the bottle air tight till it cooled
down to room temperature.

Why did the tiny bubbles appeared?

54 Paheli kept some water in a beaker for heating. She observed that tiny Bubbles appear before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till cooled down to room temperature.
(b) Do you think tiny Bubbles will appear on heating the water taken out from the bottle? Justify your answer.

Q. Will the tiny air bubbles seen before the water actually boils, also appear if we do the boiling water in a vessel activity by reheating boil water kept in an air tight bottle?

Q. Garima observed that when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles formed all around inside the bottle. Help Garima to know why it happened?

oojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.

(i) Bubbles of air came out from the bottle.

(ii) Some water entered the bottle.

(iii) Nitrogen gas came out in the form of bubbles and oxygen gets dissolved in water.

(iv) No bubbles formed, only water entered the bottle

Which observations is/are correct?

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In the form of oxygen, the air is dissolved in water. When the air in the water escapes during the boiling process, tiny bubbles form.As a result of the evolution of air dissolved in water, small bubbles appeared.

In the form of oxygen, the air is dissolved in water. When the air in the water escapes during the boiling process, tiny bubbles form.
As a result of the evolution of air dissolved in water, small bubbles appeared.