Q9 of 19 Page 13

When water solidifies to ice then heat is

a) Liberated


b) Absorbed


c) No change


d) Depending on the condition heat may absorbed or liberated.

Liberated


When water liberates heat its temperature decreases. If at 0°C water further liberates energy then solidifies to ice. This process is known as freezing.


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7

Correct the following statements.

a) Water boils at 100°C under atmospheric pressure. 14 Matter Around us


b) a liquid evaporates above its boiling point


c) solids have the largest inter-particle space.


d) gases have the strongest inter-particle forces.

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Why do we prefer to sip hot tea with a saucer rather than a cup?

 10

Convert the following temperatures to the Celsius scale.

(a) 283k


(b) 570k

 11

Convert the following temperatures to the Kelvin scale.

(a) 27°c


(b) 367°c