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प्रश्न
Take some water in a glass. Put a lemon in it. Now keep putting salt in the water, half-a-spoon at a time. Were you able to float your lemon in water?
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उत्तर
Yes, the lemon would float in water containing excess salt. This is due to the fact that water gets heavier when salt has been added in excess amount. And lemon (lighter in weight) will be able to float on heavier water.
APPEARS IN
संबंधित प्रश्न
You put a steel plate on water. Would it sink or float? What would happen to a spoon?
Do this experiment in groups of four friends. Each group will need a big pot filled with water and the things listed on the table. Put each thing one by one in water and observe. Write your observations in the table given below.
Mark [✓] for the things that float. Mark [×] for those that sink.
| Things to be put in water | I guessed before I did it | I saw when I did it |
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| Iron nail or pin | ||
| Matchstick | ||
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Aluminum foil (from medicine packing)
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| A piece of ice |
What do you think, the lemon floated in salty water, because ______
Does that mean that now the water does not have salt? If it has, then where is the salt?
What difference did you see - in the water with salt, and
the water with chalk powder - after keeping for some time?
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.
You also try to do the same and then tell - which drop went ahead? Why did it slide faster?
You have washed your handkerchief and you want to dry it quickly. What all can you do?
What things do you put in water to make tea? Which of those things dissolve in water?
Find out from the other groups which things floated and which sank in the water?
After doing the experiment, fill in the blanks.
The aluminium foil ______ when it was spread out. When pressed tightly into a ball it ______. This may have happened because ______
On Sunday Ayesha’s cousin, brother Hamid came to her house to play. As soon as he came he asked his aunt to make his favourite shakkarpara (a sweet dish). Ammi said, “Let me come back from the market, then I will make some for you. Why don’t you help me? Take two glasses of water and put a bowl of sugar in it. Mix it till it dissolves.” Hamid thought, “Let me finish this work fast. Then I will watch TV”.
Suggest some ways to Hamid for quickly dissolving sugar.
