Question

 

The general form of a phase diagram is given below. Observe that this phase diagram is divided into three regions by the blue boundary lines similar to the way the interactive phase diagram for CO2 was divided. Compare this general form of this phase diagram with the interactive phase diagram for CO2 and classify points a through g on the phase diagram according to the number of phases present at each point.

One phase:             Two Phases:        Three Phases:

Answer 1

One phase: a, b, c

Two phases: d, e, f

Three phases: g

a - solid => 1 phase

b - liquid => 1 phase

c - gas => 1 phase

d - solid-gas equilibrium => 2 phases

e - solid-liquid equilibrium => 2 phases

f - liquid-gas equilibrium => 2 phases

g - triple point, solid-liquid-gas equilibrium => 3 phases