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प्रश्न
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 | ______ | ______ |
उत्तर
| Things | Did it dissolve or not? | What happened after keeping for 2 minutes? |
| 1. Salt | Yes | Salt and water got to be mixed together completely. Water remained transparent |
| 2. Soil | No | Soil settled down at the bottom. Water became muddy. |
| 3. Chalk powder | No | Chalk powder settled down at the bottom. Water became whitish. |
| 4. 1 spoon milk | Yes | Milk and water got mixed together completely. Water became whitish. |
| 5. Oil | Yes | Oil floats on the surface of the water. |
APPEARS IN
संबंधित प्रश्न
Would the cap of a plastic bottle sink or float on water?
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?
Does that mean that now the water does not have salt? If it has, then where is the salt?
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?
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?
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.
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.
At your house, what things are made by drying in the sun?
