Give one example in each case. [3 marks]
(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.

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Solution

The examples in each case is as follows:
(a) Melting of ice [1 mark]
(b) Cooking of chapatti [1 mark]
(c) Freezing of water to form ice[1 mark]

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Question 8

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a:
(a) physical change that can be reversed
(b) chemical change that can be reversed
(c) physical change that cannot be reversed
(d) chemical change that cannot 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.

Give one example in each case:

Change occurs on cooling but can be reversed.

Give one example in each case:

Change occurs on mixing two substances, but can be reversed.

3. Change of bud into flower is a change which can not be reversed. Give four more such examples.

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Give one example in each case. [3 marks] (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.

The examples in each case is as follows: (a) Melting of ice [1 mark] (b) Cooking of chapatti [1 mark] (c) Freezing of water to form ice[1 mark]

Give one example in each case. [3 marks]
(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.

The examples in each case is as follows:
(a) Melting of ice [1 mark]
(b) Cooking of chapatti [1 mark]
(c) Freezing of water to form ice[1 mark]