One day Ayesha’s mother put some water to boil on the stove for making tea. She got busy with something and forgot about it. When she remembered and came to check, she found very little water left in the pan.

Think where did the water go?

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Solution

The water gets evaporated.

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Question 19.2

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

Q. Khushi wanted to eat rice and kidney bean (rajmah). She requested her mother to cook the same for lunch tomorrow. At night her mother took a cup of kidney bean and put them in a container having some water. She kept the container covered overnight. Next morning, she cooked rice and kidney beans for lunch. Khushi inquired her mother the following questions:
(a) Why did she soak kidney beans in water overnight?
(b) Name the scientific phenomenon involved in above process.
(c) Name at least one more food item that is cooked in this way.

Varsha went to her native village recently. She found out that her village faces acute shortage of water. People in her village are basically involved in agricultural activities and use traditional methods of irrigation. They also depend on rain for most of the irrigation. In addition, they clear forests for agricultural activities. Also, during summers they face drought like situations as the villagers are dependent on nearby river for day to day usage of water but it dries up. She thinks that she should do something to make the situation better for the people but has no idea how she can help the villagers. Can you suggest some ideas? [5 MARKS]

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

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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One day Ayesha’s mother put some water to boil on the stove for making tea. She got busy with something and forgot about it. When she remembered and came to check, she found very little water left in the pan.Think where did the water go?

The water gets evaporated.

One day Ayesha’s mother put some water to boil on the stove for making tea. She got busy with something and forgot about it. When she remembered and came to check, she found very little water left in the pan.

Think where did the water go?