Question

2. The temperature-time graph given below shows the heating curve for pure wax. From the

graph answer the following:

a) What is the physical state of the substance at the points A, B, C and D?

b) What is the melting point of the substance?

c) What is its boiling point?

d) Which portions of the graph indicates that change of state is taking place.

e) Name the terms used for heat absorbed during change of states involved in

above processes.​

Answer 1

Answer:

ur answer is given in the attachment

hope this helps u!!

Answer 2

Answer:

At point A :  The substance is in the solid state. where Solid wax  (1/2).

   At point B :  The substance has started melting. It exists both in the solid         and liquid states.

  At point C : The substance is in the liquid state.

  At point D :  The substance has started boiling . It exists both into the liquid  and gaseous states.

(b) The melting point of the substance wax is 15°C(1 /2).  

(c) The boiling point of the substance  wax is = 110°C (1/2).

 

(d) The A 1  to  B 1  and  D 1 to D 2 . Or Straight lines in the curve parallel to Time-axis (x-axis) indicate the change of state. These portions are to  (Solid to liquid) and  to  (Liquid to vapor state).

(e) From A 1 to B 1 - latent heat of fusion. D 1 to D 2 - Latent heat of vaporization. During melting, at melting point, the heat absorbed is called latent heat of fusion. During   boiling, at boiling point, the heat absorbed is  called latent heat of vaporization.

Explanation: