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

Question

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

Answer in Brief

Solution

To explain the differences between changes that can or cannot be reversed, some examples are given below:

(i) If we inflate a balloon, the size and shape of the balloon undergo a change. However, the original size and shape of the balloon can be obtained back by allowing the air to escape from the balloon. This means that the change that occurs by inflating a balloon can be reversed. But, if the balloon bursts after being inflated, then its original size and shape cannot be obtained back. Thus, in this case, the change cannot be reversed.

(ii) If we fold a piece of paper, then the shape and size of the paper undergo a change. In this case, the original shape and size of the original paper can be obtained back. Thus, this change can be reversed. However, if we cut the piece of paper, the change in the shape and size of the paper cannot be reversed.

(iii) After we roll out a chapatti from a ball of dough, the chapatti can be converted back into a ball. Thus, the change occurring here can be reversed. But, if we cook the chapatti on a Tawa, then it cannot be converted back into a ball of dough. Thus, the change is irreversible.

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Classification of Change: Reversible and Irreversible Changes

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Very Short Answer Type Question:
Give two examples of irreversible changes.

Very Short Answer Type Question:
Some common changes are given in the below Table. Which of these changes do you think can be reversed?

Change	Can be reversed
(i) Raw egg to boiled egg	Yes/No
(ii) Batter to idli
(iii) Wet clothes to dirty clothes
(iv) Woollen yarn to knitted sweater
(v) Grain to its flour
(vi) Cold milk to hot milk
(vii) straight string to a cold string
(viii) Bud to flower
(ix) Milk to paneer
(x) Cow dung to biogas
(xi) stretched rubber band to its normal size
(xii) Melting of ice-cream

Match the following.

Bud to flower	Dr. A.P.J. Abdul Kalam
Reversible change	Recyclable waste
India 2020	Organic waste
Paper	Melting of ice
Vegetables	Irreversible change

Circle the odd one.

Differentiate reversible and irreversible changes.

Dissolving sugar in water is a ______ change.

Pick the change that can be reversed from the following.

Which of the following change cannot be reversed?

lt was Paheli’s birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli’s home:

Simba blew balloons and put them on the wall.
Some of the balloons got burst.
Paheli cut colourful strips of paper and put them on the wall with the help of tape.
She also made some flowers by origami (paper folding) to decorate the house.
Her father made dough balls.
Mother rolled the dough balls to make puries.
Mother heated oil in a pan.
Father fried the puries in hot oil.

Identify the activities at Paheli’s home as those that can be reversed and those which cannot be reversed.

Find the odd one out. Give reason for your choice.