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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?
Would the cap of a plastic bottle sink or float on water?
Have you seen that something floats on water while others sink?
Find out from the other groups which things floated and which sank in the water?
After doing the experiment, fill in the blanks.
The iron nail ______ in water but the katori ______. I think this happened because ______
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?
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?
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?
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.
