We are asked to identify which of the following phase changes must heat be added to overcome intermolecular forces.
Recall that a phase diagram shows the transition of matter between solid, liquid, and gas phases as temperature and pressure changes.
In a phase diagram, the different phases can be identified by their location:
• Solid: can be found at high pressure and low temperature
• Liquid: can be found between the solid and gas regions
• Gas: can be found at low pressure and high temperature
During which of the following phase changes must heat be added to overcome intermolecular forces?
A) I only
B) II only
C) I and II only
D) I and III only
E) II and III only
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