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Question

Give reason :
Freezing of water to ice and evaporation of water are physical changes .

Solution
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Freezing of water to ice and evaporation of water are physical changes because water can be brought back to its original (liquid) form by
1. We can heat the ice to bring it back to water.
2. We can cool down the vapours to bring it back to water.

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Q1
Give reason :
Freezing of water to ice and evaporation of water are physical changes .
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Q2

Give reason:

(a)Freezing of water to ice and evaporation of water are physical changes.

(b)Burning of a candle is both a physical and a chemical change.

(c)Burning of paper is a chemical change.

(d)Cutting of a cloth piece is a physical change, though it cannot be reversed.


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Q3
<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Give reason:

(a) Freezing of water to ice and evaporation of water are physical changes.

(b) Burning of a candle is both a physical and a chemical change.

(c) Burning of paper is a chemical change.

(d) Cutting of a cloth piece is a physical change, though it cannot be reversed.

(4 Marks)
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Q4

Some changes are given below.

(a) Freezing of water

(b) Melting of ice

(c) Boiling of water

Are these considered as physical changes? If yes, give the reason.


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Q5
"Melting of ice and solidication of water are physical change" .
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