From the graph answer the following.
(i) What is the physical state of the substance at the
points A,B,C, and D?
(ii) What is the melting point of the substance?
(iii) What is its boiling point?
(iv) Which portions of the graph indicates that change of
state is taking place?
(v) Name the terms used for heat absorbed during change of
states involved in the above processes.
Answer:
(i)
At point A= Solid wax. (1/2)
At point B = Solid as well as liquid wax.
(Melting continues) (1/2)
At point C= Liquid wax (1/2)
At point D = Liquid as well as vapour state (Boiling
continues) (1 /2)
(ii) Melting point of wax = 15°C (1 /2)
(iii) Boiling point of wax = 110°C (1/2)
(iv) 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 vapour state). (1)
(v) 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 vaporisation.
(1/2+1/2)
You need to login to perform this action.
You will be redirected in
3 sec
