Q57 of 160 Page 37

(a) Define the term ‘latent heat of vaporization’ of liquid. What is the value of the of the latent heat of vaporization of water?

(b) Draw a labeled diagram of the experimental set-up to study the latent heat of vaporization of water.

(a) The latent heat of vaporisation of a liquid is the quantity of heat in joules required to convert 1 kilogram of the liquid (at its boiling point) to vapour or gas, without any change in temperature. The latent heat of vaporization of water is 22.5 × 105 joules per kilogram (or 22.5 × 105 j/kg).

(b)


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How will you demonstrate that water vapour is present in air?

 56

(a) Define the term ‘latent heat of fusion’ of a solid. How much is the latent heat of fusion of ice?

(b) Draw a labeled diagram of the experimental set-up to study the latent heat of fusion of ice.

 58

(a) What is sublimation? Name two substances (other than ammonium chloride) which undergo sublimation.

(b) Draw a labeled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.

 59

(a) What are the two ways in which the physical states of matter can be changed?

(b) Draw the ‘states of matter triangle’ to show the interconversion of states of matter.


(c) How can the evaporation of a liquid be made faster?