The following shows the heating curve of a solid. Based on the graph answer the following questions
(1 to 5):
1. Identify the melting point of the solid and the boiling point of its liquefied form.
2. Name the portion of the graph in which the solid exists only as vapour.
3. How is point C of the graph different from point D?
4. What will happen if the substance is heated beyond point F?
5. Which portion(s) of the graph will be affected if some impurity is mixed with the solid? Why?
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Answers
Answer:
1)B is melting point.
D is boiling point.
2) the portion from E to F.
3)C represents liquid state of the solid.
D is the boiling point of the liquefied form of the solid, means at this point liquid starts boiling.
4)At point F the physical state of the substance is gaseous, thus on heating gas both it's vapor pressure and the volume it occupies increase. Also, the kinetic energy of gas particles increases.
5) If impurity is added then the portion A to B will be affected as its melting point will decrease and also the portion from B to C as the range of value of melting point will be varying. Both of these effects are due to wearing of of the molecular lattice structure of the solid (because of addition of impurities).
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