NCERT solutions for Environmental Studies - Looking Around [English] Class 5 chapter 7 - Experiments with Water [Latest edition]

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?

Would the cap of a plastic bottle sink or float on water?

Have you seen that something floats on water while others sink?

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. 

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 ______ 

Find out from the other groups which things floated and which sank in the water?

After doing the experiment, fill in the blanks.

The empty plastic bottle ______ on water. The bottle filled with water ______ because ______ 

Find out from the other groups which things floated and which sank in the water?

After doing the experiment, fill in the blanks.

The aluminium foil ______ when it was spread out. When pressed tightly into a ball it ______. This may have 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?

What do you think, the lemon floated in salty water, because ______ 

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.

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.

Could you see the salt after it dissolved in water? If no, why?

Does that mean that now the water does not have salt? If it has, then where is the salt?

What difference did you see - in the water with salt, and
the water with chalk powder - after keeping for some time?

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?

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? 

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?

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?

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? 

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.