Advertisements
Advertisements
Question
What difference did you see - in the water with salt, and
the water with chalk powder - after keeping for some time?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
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?
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 | ______ | ______ |
Could you see the salt after it dissolved in water? If no, why?
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?
You have been given some mishri pieces (lumps of sugar). Suggest some ways to dissolve them quickly.
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.
Why did Chittibabu and Chinnababu keep their mango jelly in the sun?
