Q5 of 7 Page 51

Give few examples to explain the difference between changes that can or cannot be reversed.

Following are the examples of changes that can be reversed:

(i) Drawing a picture with a pencil.


(i) Filling glass with juice.


(ii) Opening and closing of window.


Following are the examples of changes that cannot be reversed


(i) Curding of milk.


(ii) Ripening of fruit.


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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.

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

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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?

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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.