A student investigates the cooling of hot water in a beaker. The apparatus is shown in Fig. 2.1. Fig. 2.1 In the experiment, the student aims to investigate the effect on the temperature of the hot water as cold water is added. (i) Complete the sentence to explain why it is important to add the cold water without delay at each stage. The cold water is added without delay . (ii) Complete the sentence to explain the reason for stirring the water at each stage. The student stirs the water before recording the temperature .

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