Question 18

Change of a bud into a flower is a change which cannot be reversed. Give four more such example.

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Solution

Changes that cannot be reversed are called irreversible changes. Some examples are as follows:
Milk into curd
Burning of wood
Ripening of fruits
Digestion of food

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Question 17

Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.

Question 15

Give one example in each case.
Change which occurs on heating but can be reversed.
Change which occurs on heating but cannot be reversed.
Change which occurs on cooling but can be reversed.
Change which occurs on mixing two substances but can be reversed.
Change which occurs on mixing two substances but cannot be reversed.

Q. Give one example in each case.
(a) Change which occurs on heating but can be reversed.
(b) Change which occurs on heating but cannot be reversed.
(c) Change which occurs on cooling but can be reversed.
(d) Change which occurs on mixing two substances, but can be reversed.
(e) Change which occurs on mixing two substances, but cannot be reversed.

Question 2

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

Question 1

Pick the change that can be reversed from the following
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower

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Question 18 Change of a bud into a flower is a change which cannot be reversed. Give four more such example.

Changes that cannot be reversed are called irreversible changes. Some examples are as follows: Milk into curd Burning of wood Ripening of fruits Digestion of food

Question 18

Change of a bud into a flower is a change which cannot be reversed. Give four more such example.

Changes that cannot be reversed are called irreversible changes. Some examples are as follows:
Milk into curd
Burning of wood
Ripening of fruits
Digestion of food