Define specific latent heat of fusion.

1. (a)Define specific latent heat of fusion.[2]
2. (b)(i)A student sets up the apparatus shown in Fig. 3.1 in order to investigate the melting of ice. [Figure 3.1] The heater is switched on. When the pure ice is melting at a constant rate, the data shown in Fig. 3.2 are collected. [Figure 3.2] The specific latent heat of fusion of ice is 332 Jg-1. State what is observed by the student that shows that the ice is melting at a constant rate.[1]
3. (b)(ii) 1.Use the data in Fig. 3.2 to determine the rate at which thermal energy is transferred to the melting ice,[4]
4. (b)(ii) 2.Use the data in Fig. 3.2 to determine the rate at which thermal energy is gained from the surroundings.[4]

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