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 in the table.

Things

Did it dissolve or not?

What happened after keeping for 2 minutes?

Salt

Soil

Chalk powder

1 spoon milk

Oil

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Solution

Disclaimer: The purpose of this question is to introduce the children to the method of general science activities. This involves certain prior imagination followed by experimentation and logical deductions. Keeping this process of imagination and experimentation in mind, the answer to this question has not been provided.

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Do this experiment in groups of four friends. Each group will need a big pot filled with water and the things listed in the table. Put each thing one-by-one in water and observe.

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
(a) Empty bowl (katori) (b) After putting in 6-7 small pebbles, one-by-one
Iron nail or pin
Matchstick
(a) Empty plastic bottle with its lid closed (b) Bottle half-filled with water (c) Bottle full of water
Aluminium foil (from medicine packing) (a) Open and spread out (b) Pressed tightly into a ball (c) In a cup-like shape
(a) Soap cake (b) Soap cake on a small plastic plate
A piece of ice

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

After doing the experiment, fill in the blanks.

Q. Grams and Kilograms
Name 5 things that we usually buy —

In grams	In kilograms
1.	1.
2.	2.
3.	3.
4.	4.
5.	5.

Some changes are listed in the following table. For each change, write in the blank column whether the change can be reversed or not.

S. No.	Change	Can be reversed (Yes/No)
1.	Sawing of a piece of wood	-
2.	Melting of ice candy	-
3.	Dissolving sugar in water	-
4.	Cooking food	-
5.	Ripening of a mango	-
6.	Souring of milk	-

You know that a metaphor compares two things by transferring a feature of one thing to the other (See Unit 1).

(i) Find metaphors for the following words and complete the table below.

Also try to say how they are alike. The first is done for you.

Storm	Tiger	Pounces over the fields, growls
Train
Fire
School
Home

Q. Father gave them some idea of the weight of each thing.

Thing loaded	Weight
A sack of wheat	100 kg
A sack of rice	35 kg
Water tank	50 kg
Almirah	70 kg
A table	10 kg
A chair	5 kg
A mattress	20 kg
Bamboo ladder	10 kg
Pots and pans	10 kg

• Find out the total weight they had loaded on the cart.
Now they decided to remove a few things from the cart.
• Which things should be removed so that the weight of the load is not more than 700 kgs?

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Things	Did it dissolve or not?	What happened after keeping for 2 minutes?
Salt
Soil
Chalk powder
1 spoon milk
Oil