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

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Solution

Air and water are dissolved in the form of oxygen.
Because the air dissolved in the water starts escaping in the form of tiny bubbles due to heat from the sun, tiny bubbles appeared all-around around the bottle when it was left in the open sunshine.

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Q. Raghav dipped an empty bottle vertically in a trough of water as shown in picture 1. He found that water did not enter the bottle. However, when he tilted the bottle slightly, he found bubbles coming out as shown in picture 2.
Figure
(a) Why did water not enter the bottle at first?
(b) Explain what Raghav observed when he tilted the bottle.

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?

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 appear?

(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.

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?

During summer, Kavita carries water in a transparent plastic bottle to her school. One day, she left her bottle in the school. The bottle still had some water left in it. The following day, she observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water formed due to ____.

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

Air and water are dissolved in the form of oxygen.Because the air dissolved in the water starts escaping in the form of tiny bubbles due to heat from the sun, tiny bubbles appeared all-around around the bottle when it was left in the open sunshine.

Air and water are dissolved in the form of oxygen.
Because the air dissolved in the water starts escaping in the form of tiny bubbles due to heat from the sun, tiny bubbles appeared all-around around the bottle when it was left in the open sunshine.