A block of paraffin wax was heated gently, at a steady rate. Heating was continued after the

Question:

A block of paraffin wax was heated gently, at a steady rate. Heating was continued after the wax had completely melted. The graph of Figure 19.16 shows how the material’s temperature varied during the experiment.
a. For each section of the graph (AB, BC and CD), describe the state of the material.
b. For each section, explain whether the material’s internal energy is increasing, decreasing or remaining constant.
c. Consider the two sloping sections of the graph. State whether the material’s specific heat capacity is greater when it is a solid or when it is a liquid. Justify your answer.