Phases

Question 1

Define a phase diagram:

Answer 1

• A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure.
• A typical phase diagram has pressure on the y-axis and temperature on the x-axis. As we cross the lines or curves on the phase diagram, a phase change occurs.
  
  • Two states of the substance coexist in equilibrium on the lines or curves.

Question 2

Analyze the Phase Diagram

Answer 2

• Triple point: Point at which the three states of matter: gas, liquid, and solid coexist
• Critical point: Point at which the substance is indistinguishable between liquid and gaseous states

Question 3

Define Sublimation:

Answer 3

When a substance goes directly from a solid to a gas state

Question 4

Define Deposition:

Answer 4

When a substance goes directly from a gas to a solid state

Question 5

Defnie Melting:

Answer 5

When a substance goes from a solid to a liquid state

Question 6

Define Fusion:

Answer 6

When a substance goes from a liquid to a solid state

Question 7

Define Vaporization:

Answer 7

When a substance goes from a liquid to a gas state

Question 8

Define Condensation:

Answer 8

When a substance goes from a gas to a liquid state

Question 9

Define Critical Temperature:

Answer 9

Temperature above which the liquid phase of a substance cannot exist, regarless of the pressure applied

Question 10

Define Critical Pressure:

Answer 10

Minimum pressure required to liquefy a gas at its critical temperature