indicates Consider the phase diagram shown below. The area labeled solid phase for the substance 1. C. y E. y and z 1,000 800 P (tom) 600 100 10 0 10 20 30 40 50 60 T (C) Consider the heating curve shown below. The slope of the corresponds to the heat capacity of the gas of the substance. 2. segment A. AB B. BC C. CD D. DE E. EF liquid and gas solid and Equid Ã¼quid A solid Heat added () Solution (1) At low Temperature and low pressure , solid phase exists. So , (A) w is correct (2) Heat Capacity of Gas: The heat capacity specifies the heat needed to raise a certain amount of a substance by 1 K So, option (E) EF is correct .