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Phase Change

The diagram b...

Question

The diagram below shows the change of phases of a substance on a temperature-time graph on heating the substances at a constant rate.

(a) What do the parts AB, BC, CD and DE represent?

(b) What is the melting point of the substance?

(c) What is the boiling point of the substance?

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Solution

(a) AB represents the rise in temperature of solid from $0^{o} C$ to $t_{1}^{o} C$ .

BC represents the melting at temperature $t_{1}^{o} C$ .

CD represents the rise in temperature of liquid from $t_{1}^{o} C$ to $t_{3}^{o} C$ .

DE represents boiling at temperature $t_{3}^{o} C$ .

(b) The melting point of the substance is $t_{1}^{o} C$ .

(c) The boiling point of the substance is $t_{3}^{o} C$ .

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