Question

The temperature-time graph given alongside shows the heating curve for pure wax. From the graph answer the following: (a) What is the physical state of the substance at the point A, B, C and D? (b) What is the melting point of the substance? (c) What is the boiling point? (d) Which portions of the graph indicates that change to state is taking place? (e) Name the terms used for heat absorbed during change of states involved in above process.

  • Matter in our surroundings CBSE Class 9
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Answer

(a) A-Solid state,

B-Both solid and liquid status,

C- liquid state,

D-Both liquid and gaseous states

(b) 15°C

(c) 110°C

(d) A1B1 and D1D2

(e) A1B1-Latent heat of fusion

D1D2-Latent heat of vaporisation

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