. The diagram shows the change of phases of a substance on a temperature-time


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

Diagram

(a)What do 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?

 

Best Answer

(a) AB part shows the rise in temperature of solid from 00 C to t10 C

BC part shows melting at temperature t10 C

CD part shows rise in temperature of liquid from t10 C to t30 C

DE part shows the boiling at temperature t30 C

(b) The melting point of the substance is t10 C

(c) The boiling point of the substance is t30 C

 

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