CAIE IGCSE Physics 2.2.2 Specific Heat Capacity Topic Practice

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Covered syllabus points

2.2.2.1—A rise in the temperature of an object2.2.2.2—An increase in temperature of an2.2.2.3—Specific heat capacity as energy2.2.2.4—Experiments to measure the specific

Question 1

[Maximum number: 1]

In a famous experiment, a scientist showed that, when water in an insulated tub is stirred, its temperature increases.

What can be concluded from this experiment?

A

Temperature is a store of energy.

B

The water absorbs heat from the surroundings.

C

Work done by stirring increases the internal energy of the water.

D

Energy is not conserved.

Question 2

[Maximum number: 6]

Fig. 4.1 shows a stainless-steel saucepan being heated on an electric cooker. The saucepan contains water.

Fig. 4.1

Fig. 4.1

Question (a)

(a)

State what happens to the water particles as the water temperature increases.

[ 1 ]

Question (b)

(b)

The saucepan contains 250 cm3250 \mathrm{~cm}^{3} of water. The specific heat capacity of water is 4200 J/(kg∘C)4200 \mathrm{~J} /\left(\mathrm{kg}^{\circ} \mathrm{C}\right). The density of water is 1000 kg/m31000 \mathrm{~kg} / \mathrm{m}^{3}.

[ 3 ]

Question (i)

(i)

Calculate the energy required to increase the water temperature from 20∘C20^{\circ} \mathrm{C} to 65∘C65^{\circ} \mathrm{C}.
energy = [3]

[ 3 ]

Question (c)

(c)

The stainless-steel saucepan is replaced with an aluminium saucepan of the same mass. It contains the same volume of water.

The specific heat capacity of stainless steel is 500 J/(kg∘C)500 \mathrm{~J} /\left(\mathrm{kg}^{\circ} \mathrm{C}\right).
The specific heat capacity of aluminium is 890 J/(kg∘C)890 \mathrm{~J} /\left(\mathrm{kg}^{\circ} \mathrm{C}\right).
Explain how using an aluminium saucepan will affect the time taken to heat the water.

[ 2 ]
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