Question

While heating ice in a beaker with a thermometer suspended in it, a student recorded the following observations:
Time (in min.) 0 1 2 3 4 5 6 7 8 10 15 20 25 30 35
Temp. (in 0C) -3 -1 0 0 5 8 12 15 19 22 30 50 73 100 100

Based on the above observations, answer the following questions: (a) State the change(s) observed between 2-3 min. and name the process involved. (b) Between 30-35 min., the temperature remains constant. State the reason for this. Name the heat involved in the process and define it.

  • Matter in our surroundings CBSE Class 9
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Answer

(a) Between 2-3 min, ice converts into water. This process is known as fusion.

(b) Between 30-35 min, the temperature remains constant because the heat supplied is used up in overcoming the intermolecular forces of liquid to change into vapours. The heat involved in the process is latent heat of vaporisation. It is the amount of heat energy required to change 1 kg of liquid into gas at its boiling point.

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