How to Answer Phase Diagram Based Questions – Part 1

A phase diagram is a type of chart used to display conditions (pressure, temperature, etc.) at which thermodynamically distinct phases (viz., solid, liquid or gaseous states) occur and coexist at equilibrium.


Physical chemistry, engineering, mineralogy, and materials science utilize phase diagrams.

Question:

Refer to the phase diagram shown below:



Click/tap to enlarge the image

  1. Label the diagram.
  2. If the temperature decreases from 1000C to 600C at a constant pressure of 1.5 atm, which process occurs?
  3. If the pressure increases from 0.5 atm to 1.5 atm at a constant temperature of 1000C, which process occurs?
  4. What is the normal boiling point of the substance approximately?

Solution infographic:



Click/tap to enlarge the image

bp = Boiling point, mp = Melting point

Perplexed or pleased by the phase diagram solution❓ Let Chemaficionado know in the comments below or at mychemistryhomework@gmail.com❗

References:

(1)    Phase diagram. Wikipedia. https://en.wikipedia.org/wiki/Phase_diagram.
(2)    Barker, B.; Staff, P. G. AP Chemistry; Peterson Nelnet Company, 2005.

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