Question 2:
Can we reverse the following changes? If yes, suggest the name of the method.

(a) Water into water vapour

(b) Water vapour into water

(c) Ice into water

(d) Curd into milk

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Solution

(a) Reversible - It can be reversed by the process which is known as Condensation.

(b) Reversible - It can be reversed by the process which is known as Evaporation.

(c) Reversible - It can be reversed by the process which is known as Freezing.

(d) Irreversible change

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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

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
(d) Curd into milk.

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. 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?

\begin{matrix} Ice to water & Camphor to gas & Water to vapour \end{matrix}

Q. Conversion of water into water vapours is a chemical change.

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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 (b) Water vapour into water (c) Ice into water (d) Curd into milk

(a) Reversible - It can be reversed by the process which is known as Condensation. (b) Reversible - It can be reversed by the process which is known as Evaporation. (c) Reversible - It can be reversed by the process which is known as Freezing. (d) Irreversible change

Question 2:
Can we reverse the following changes? If yes, suggest the name of the method.

(a) Water into water vapour

(b) Water vapour into water

(c) Ice into water

(d) Curd into milk

(a) Reversible - It can be reversed by the process which is known as Condensation.

(b) Reversible - It can be reversed by the process which is known as Evaporation.

(c) Reversible - It can be reversed by the process which is known as Freezing.

(d) Irreversible change