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Chapter 6 Changes Around Us Solutions

Question - 1 : - To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?

Answer - 1 : - Yes, it can be reversed by unfolding the dress.

Question - 2 : - You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?

Answer - 2 : - No, this change (breaking of toy) cannot be reversed.

Question - 3 : - Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.

Sl No

Change

Can be reversed Yes/No

1

The sawing of a piece of wood

2

The mel

Sl No

Change

Can be reversed Yes/No

1

The sawing of a piece of wood

2

The melting of ice candy

3

Dissolving sugar in water

4

The cooking of food

5

The ripening of a mango

6

Souring of milk

ting of ice candy

3

Dissolving sugar in water

4

The cooking of food

5

The ripening of a mango

6

Souring of milk

Answer - 3 : -

Sl No

Change

Can be reversed Yes/No

1

The sawing of a piece of wood

No

2

The melting of ice candy

Yes

3

Dissolving sugar in water

Yes

4

The cooking of food

No

5

The ripening of a mango

No

6

Souring of milk

No

Question - 4 : - A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Answer - 4 : -

This change can be reversed if a pencil is used to draw the picture. If a pen or colors are used to draw the picture, change cannot be reversed.

Question - 5 : - Give examples to explain the difference between changes that can or cannot be reversed.

Answer - 5 : -

Changes that can be reversed

i) Opening and closing the door

ii) Filling glass with water

Changes that cannot be reversed

i) Conversion of milk into curd

ii) Ripening of fruit

Question - 6 : - A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilized. Can the change in POP be reversed?

Answer - 6 : -  No, the change in POP cannot be reversed since it is a chemical change.

Question - 7 : - A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?

Answer - 7 : - No, these are irreversible chemical changes.

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