Give one example in each case:
Change occurs on cooling but can be reversed.

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Solution

Reversible changes:
The changes which can be reversed or are temporary are known as reversible changes.
Examples of reversible changes are melting of wax, freezing of ice, and boiling water.
Irreversible changes:
The changes which are permanent are known as irreversible changes.
Examples of irreversible changes are the burning of fuels and rusting of Iron.
Example of change that occurs on cooling but can be reversed:
Formation of ice from water.

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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

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.

Give one example in each case:

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

Give one example in each case:

Change occurs on heating but 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.

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Give one example in each case: Change occurs on cooling but can be reversed.

Give one example in each case:
Change occurs on cooling but can be reversed.