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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Solution

The example of each case is as follows:
Heating of an iron rod
Baking of chapatti
Formation of ice from water
Formation of a salt solution
Mixing of cement and water

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Similar questions

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 5

Salt can be separated from its solution (salt dissolved in water) because
(a) mixing of salt in water is a change that can be reversed by heating and melting of salt
(b) mixing of salt in water is a change that cannot be reversed
(c) mixing of salt in water is a permanent change
(d) mixing of salt in water is a change that can be reversed by evaporation

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 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.

Q. Which change can be easily be reversed?

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The example of each case is as follows: Heating of an iron rod Baking of chapatti Formation of ice from water Formation of a salt solution Mixing of cement and water

The example of each case is as follows:
Heating of an iron rod
Baking of chapatti
Formation of ice from water
Formation of a salt solution
Mixing of cement and water