Physics 9702 · AS & A Level · Specific heat capacity and specific latent heat

Specific heat capacity and specific latent heat — practice question

(a)[2]

State the meaning of specific latent heat.

(b)

A student uses the apparatus shown in Fig. 3.1 to find a value for the specific latent heat of fusion of ice.

(b(i))[1]

Between time $0$ and time $10.0$ minutes, $65\,\text{g}$ of ice melts. Use Fig. 3.2 to find the mass of ice melted between time $12.0$ minutes and time $22.0$ minutes.

(b(ii))[1]

Explain why the rate at which thermal energy is transferred from the surroundings to the ice remains constant even though the power of the heater is changed.

(b(iii))[4]

Determine a value for the specific latent heat of fusion $L$ for ice.

(b(iv))[2]

Calculate the rate at which thermal energy passes from the surroundings to the ice.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: thermal energy needed per unit mass (to change state)

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