Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm?
A)The melting point will decrease.
B)The melting point will remain the same.
C)The melting point will increase.
D)The substance will not melt at pressures of 1 atm and above; instead, the solid sublimes to form the gas phase.

Question

Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm? 
A)The melting point will decrease. 
B)The melting point will remain the same. 
C)The melting point will increase. 
D)The substance will not melt at pressures of 1 atm and above; instead, the solid sublimes to form the gas phase.

Quizplus · Accepted Answer

From the phase diagram, we can see that the melting curve has a positive slope (i.e. increasing pressure increases the melting point). Therefore, as the pressure is increased above 1 atm, the melting point of the substance will also increase.

Based on the Phase Diagram Shown Below, How Will the Melting