Experiments with Water
Ayesha put a puffed puri in a bowl of water. Would it sink or float?
The puri would float.
You put a steel plate on water. Would it sink or float? What would happen to a spoon?
The steel plate would float. The spoon would sink.
Would the cap of a plastic bottle sink or float on water?
The cap of a plastic bottle would float on the water.
Have you seen that something floats on water while other sinks?
Yes, I have seen that something floats on water while other sinks.
Mark [√] for the things that float. Mark [X] for the things that sink.
|Things to be put in water||I guessed before, I did it||I saw when I did it|
|Empty bowl (katori)||X||X|
|After putting in 6-7 small pebbles one by one||X||X|
|Iron nail or pin||X||X|
|a). Empty plastic bottle with its lid closed||√||√|
|b). Bottle half-filled with water||√||√|
|c). Bottle full of water||X||X|
|Aluminum foil (from medicine packing)|
|a). open and spread out||√||√|
|b). pressed tightly into a ball||X||X|
|c). in a cup-like shape||√||√|
|a). soap cake||X||X|
|b). soap cake on a small plastic plate||√||√|
|A piece of ice||√||√|
After doing the experiment, fill in the blanks.
1). The iron nail ______________ in water but the katori ______________. I think this happened because _______________
2). The empty plastic bottle ___________ on water. The bottle filled with water __________ because ______________________________
3). The aluminium foil __________ when it was spread out. When pressed tightly into a ball it _________. This may have happened because ___________________________________.
1). The iron nail sank in water but the katori floated. I think this happened because the iron nail displaced less amount of water than the water displaced by katori.
2). The empty plastic bottle floated on the water. The bottle filled with water sank because the filled water bottle displace less amount of water than its weight.
3). The aluminium foil floated when it was spread out. When pressed tightly into a ball it sank. This may have happened because the spread aluminium foil displaces more amount of water than its weight.
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?
Yes, the lemon starts floating on the water.
What do you think, the lemon floated in salty water because the water becomes thick by adding the salt and the lemon starts floating.
Could you see the salt after it dissolved in water? If no, why?
We cannot see the salt after it is dissolved in water. Salt is soluble in water.
Does that mean that now the water does not have salt? If it has, then where is the salt?
No, it does not mean that water does not have salt. The salt is completely dissolved in water therefore we cannot see it.
What difference did you see- in the water with salt, and the water with chalk powder- after keeping for some time?
Salt is completely dissolved in the water whereas the chalk powder is settled down at the bottom.
Which of the two would you be able to separate from the water by straining with a cloth- salt or chalk powder?
We can separate chalk powder from the water by straining it with a cloth.
Do you think the oil got dissolved in the water? Why do you think so?
Oil does not dissolve in the water. I think so because of the oil floating on the water surface.
You also try to do the same and then tell-which drop went ahead? Why did it slide faster?
The drop of water went ahead slide faster.
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. Think where did the water go?
The water evaporated and turned into water vapour.
Why did Chittibabu and Chinnababu keep their mango jelly in the sun?
So that the water if any present in the jelly would evaporate.
At your house, what things are made by drying in the sun?
Potato chips and papads are made by drying in the sun.
Answer in 1 or 2 sentences.
1). How liquids are measured?
Liquids are measured by volume in liters.
2). Name one soluble solid in water?
3). Name the insoluble liquid in water?
Oil is insoluble in liquid.
4). Name the saltiest sea in the world?
The Dead Sea.
5). In which year did Gandhiji, go on the Dhandi March?
6). Name the city from where Gandhiji started the Dhandi March.
7). What do you mean by soluble substance.
The substance that dissolves in other substances is called a soluble substance.
8). What do you mean by insoluble substance.
The substance that does not dissolve in other substances is called an insoluble substance.
9). What is evaporation?
The conversion of water into water vapour is called evaporation.
1). Water is called a universal solvent.
Water can dissolve most of the solids, liquids and gases in it. Therefore, water is called a universal solvent.
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