How can you change
(a) water to ice?
(b) ice to water?
(d) water vapour to water?

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Solution

(a) Water can be changed to ice by reducing the temperature. This is known as freezing of water. (b) Ice can be changed to water by heating it. This is known as melting of ice.
(c) Water vapour can be changed to water by cooling the water vapour. This is known as condensation.

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Q. Can we reverse the following change? If yes, suggest the name of the method.
(a) Water into water vapour
(b) Water vapour into water
(c) Ice into water
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Question 2:
Can we reverse the following changes? If yes, suggest the name of the method.

(a) Water into water vapour

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Q. Ramesh has three samples of substance: ice, camphor, and water. He wants to change ice into water, camphor into gas, and water into vapours. Which processes should he follow for these conversions?

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Q. Question 1

Which of the following is not a physical change?

(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)

Question 11

Can we reverse the following changes? If yes, suggest the name of the method.
Water into water vapour
Water vapour into water
Ice into water
Curd into milk

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How can you change (a) water to ice? (b) ice to water? (d) water vapour to water?

(a) Water can be changed to ice by reducing the temperature. This is known as freezing of water. (b) Ice can be changed to water by heating it. This is known as melting of ice. (c) Water vapour can be changed to water by cooling the water vapour. This is known as condensation.

How can you change
(a) water to ice?
(b) ice to water?
(d) water vapour to water?

(a) Water can be changed to ice by reducing the temperature. This is known as freezing of water. (b) Ice can be changed to water by heating it. This is known as melting of ice.
(c) Water vapour can be changed to water by cooling the water vapour. This is known as condensation.