

Explanation
a)




Boiling


Evaporation




Takes place at a particular temperature
Takes place through-out the whole volume of the liquid.
Takes place at a steady temperature



Takes place at all temperatures
Takes place only on the surface of the liquid.
Can take place at reduced temperature.






(b) \(P_1 = 1007 - 314 = 693 mmH_g\)
\(\frac{P_1}{T_1} - \frac{P_2}{T_2} = \frac{693}{350} = \frac{P_2}{300}\)
\(p_2 = \frac{963}{350} \times \frac{300}{1}\) = 594 mmH\(_g\)
Pressure in vessel at 27°C = pressure of air + S.V.P of water at 27°C
= 594 + 27 = 621mm Hg

(c) \(\alpha = \frac{L_2 - L_1}{L_1(\theta_1 - \theta_2)}\)
= 2.6 x 10-5 x 200 (33-23) = 0.052m

(d) At the solid state the molecules are tightly bounded, therefore at the melting point the heat supplied is absorbed and used to break the bonds holding the molecules together.

