CAIE IGCSE Physics 2.2.3 Melting Boiling and Evaporation Topic Practice

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Covered syllabus points

2.2.3.1—Melting and boiling in terms of energy2.2.3.2—Melting and boiling temperatures for2.2.3.3—Condensation and solidification in2.2.3.4—Evaporation in terms of the escape of2.2.3.5—Evaporation causes cooling of a liquid2.2.3.6—Differences between boiling and2.2.3.7—Temperature, surface area and air2.2.3.8—Cooling of an object in contact with

Question 1

[Maximum number: 9]

Question (a)

(a)

Three identical dishes, A, B and C, contain an equal volume of water.
Dish A is outside in sunlight and experiences no wind during the day. Dish B is outside in sunlight and experiences a strong wind during the day. Dish C is in a dark room.

Water evaporates from each dish. After 12 hours, a student measures the volume of water in each dish. Dish C contains the largest volume of water and dish B contains the smallest volume of water.

Explain, in terms of particles, why the three dishes have different volumes of water.

[ 4 ]

Question (b)

(b)

Define specific latent heat of vaporisation.

[ 2 ]

Question (c)

(c)

Fig. 5.1 shows an insulating beaker, crushed ice, an immersion heater and a thermometer.

Fig. 5.1

Fig. 5.1

The initial temperature of the ice is −60∘C-60^{\circ} \mathrm{C}.
The immersion heater is switched on and the temperature is recorded at equal intervals of time.
Fig. 5.2 shows the temperature-time graph.

Fig. 5.2

Fig. 5.2

Describe what occurs in each of the sections A, B, C and D.
A

B
C

D

[ 3 ]

Question 2

[Maximum number: 2]

Fig. 5.1 shows a kitchen tap that supplies instant boiling water.

Fig. 5.1

Fig. 5.1

Cold water passes over an electric immersion heater inside the tap.
The boiling point of water is 100∘C100^{\circ} \mathrm{C}.

State what is meant by boiling point.

Question 3

[Maximum number: 3]

Fig. 2.1 shows an electric tumble dryer used to dry wet clothes.

Fig. 2.1

Fig. 2.1

Question (a)

(a)

Hot air blows into the drum. The air gains water vapour from the clothes and then leaves the drum. The moist air enters the condenser. Cool air leaves the condenser, passes through the heating element and enters the drum again.

[ 3 ]

Question (i)

(i)

State the process by which the hot air removes water from the wet clothes.

[ 1 ]

Question (ii)

(ii)

The air is cooled as it passes through the condenser.

Describe and explain one other way in which the air leaving the condenser is different from the air entering the condenser.
description
explanation

[ 2 ]
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