Q1Written answer
Could you see the salt after it dissolved in water? If no, why?
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Worked solution
Answer: Salt, when dissolved in water, cannot be seen since it is soluble in nature.
NCERT · Class 5 · EVS
Chapter 7: Experiments with Water
Practice each question, then open the answer or worked solution.
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9 questionsQ2Written answer
Does that mean that now the water does not have salt? If it has, then where is the salt?
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Worked solution
Answer: Salt being dissolved in the water doesn’t mean the water does not have salt.
Q3Written answer
What difference did you see – in the water with salt, and the water with chalk powder – after keeping for some time?
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Worked solution
Answer: Salt, when dissolved in water, makes the water look transparent. Chalk powder doesn’t dissolve in water; instead, it settles down at the bottom of water.
Q4Written answer
Which of the two would you be able to separate from the water by straining with a cloth – salt or chalk powder?
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Worked solution
Answer: We can separate chalk powder by straining it with a cloth since it doesn’t get dissolved. Salt gets dissolved in water hence we cannot strain it.
Q5Written answer
Do you think the oil got dissolved in the water? Why do you think so?
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Worked solution
Answer: No, the oil doesn’t get dissolved in water. It just floats on the water.
Racing drops
Ayesha put two drops of oil on the lid of her tiffin box. Next to that, she put two drops of water and two drops of sugar solution. She tilted the lid. She saw some drops slid down quickly, while some were left behind.
Q1 (2)Written answer
Q1. You also try to do the same and then tell – which drop went ahead? Why did it slide faster?
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Worked solution
Answer: Drops of water slide faster than the oil drops or sugar solution since both oil and sugar solution are thicker than water and get stuck to the box making it difficult to slide.
Where did the water go?
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.
Q1 (3)Written answer
Q1. Think where did the water go?
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Worked solution
Answer: The water evaporated, and hence less water remained in the pan.
Q2 (2)Written answer
Q2. Why did Chittibabu and Chinnababu keep their mango jelly in the sun?
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Worked solution
Answer: Chittibabu and Chinnababu kept their mango jelly in the sun so that the water in it gets evaporated.
Q3 (2)Written answer
Q3. At your house, what things are made by drying in the sun?
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Worked solution
Answer: At my home, they prepare papad, pickles, sabudana papad, and mango jelly by drying them in the sun.