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

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

Calorimetry | Class 10 | ICSE | Physics | Selina

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

(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?

Solution:

(a) The AB section depicts the solid’s temperature rise from 0 degrees C to to 10 degrees C.

At 10 degrees C, the BC component begins to melt.

The temperature of the liquid rises from 10 degrees C to 30 degrees C in the CD section.

The boiling at 30 degrees C is shown in the DE portion.

(b) The substance’s melting point is 10 degrees C.

(c) The substance’s boiling point is 30 degrees C.

i

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