Question 3

The following diagram, not drawn to scale, represents the heating curve for a certain substance. Point A represents t = 0 minutes where the substance is a solid.

3.1 Define the term melting point. (2)

Use the information in the diagram to answer the following questions

3.2 Write down:

3.2.1 Between which two letters is the vapour pressure equal to the atmospheric pressure? (1)

3.2.2 The phase of a substance between letters E and F (1)

3.2.3 The process taking place between letters B and C (1)

3.3 Is the energy ABSORBED, RELEASED or UNCHANGED between D and E?

Give a reason for your answer. (2)

3.4 State how spaces between the particles change between letters A and B.


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