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प्रश्न
What do you think, the lemon floated in salty water, because ______
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उत्तर
When salt is added to water, the water gets heavy. As compared to a lemon, the salty water is heavier. So, the lemon that is lighter floats on salt water that is heavier.
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संबंधित प्रश्न
Ayesha put a puffed puri in a bowl of water. Would it sink or float?
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 |
Make groups of four friends. For the experiment, you will need 4-5 glasses or bowls, spoons, water, and the things listed in the table. Take some water in each glass. Now try to dissolve one thing in one glass. Observe what happens and note it in the table.
| Things | Did it dissolve or not? | What happened after keeping for 2 minutes? |
| 1. Salt | ______ | ______ |
| 2. Soil | ______ | ______ |
| 3. Chalk powder | ______ | ______ |
| 4. 1 spoon milk | ______ | ______ |
| 5. Oil | ______ | ______ |
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?
Which of the two would you be able to separate from the water by straining with a cloth – salt or chalk powder?
Do you think the oil got dissolved in the water? Why do you think so?
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 empty plastic bottle ______ on water. The bottle filled with water ______ because ______
