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प्रश्न
What difference did you see - in the water with salt, and
the water with chalk powder - after keeping for some time?
उत्तर
After keeping for some time, water with salt looks clear and transparent whereas the water with chalk powder looks whitish with some chalk powder settled down on the bottom of the glass.
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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 |
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?
What do you think, the lemon floated in salty water, because ______
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 | ______ | ______ |
Do you think the oil got dissolved in the water? Why do you think so?
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?
What things do you put in water to make tea? Which of those things dissolve in water?
You have been given some mishri pieces (lumps of sugar). Suggest some ways to dissolve them quickly.
