Phase Diagrams

Multiple Choice

Which letter on the diagram represents a liquid?

• A

• B

• C

• D

Multiple Choice

The temperature and pressure conditions at which the solid, liquid, and gas phases of a substance exist at the same time is called the

• Critical point

• Triple point

• Melting point

• Boiling point

Multiple Choice

Which letter on the diagram represents a solid?

• A

• B

• C

• D

Multiple Choice

Which letter on the diagram represents the triple point?

• A

• B

• C

• D

Multiple Choice

What is the normal melting point of this substance?

• 150°C

• 100°C

• -50°C

• 0°C

Multiple Choice

Which letter on the diagram represents a gas?

• A

• B

• C

• D

Multiple Choice

What is true regarding CO₂ for temperatures above 31°C?

• It does not exist

• It decomposes

• It cannot be condensed back into a liquid

• It is a plasma

Multiple Choice

What is the normal melting point of this substance?

• 40°C

• 60°C

• 100°C

• 110°C

Multiple Choice

What phase change occurs from F to E?

• Sublimation

• Deposition

• Melting

• Condensation

Multiple Choice

The temperature and pressure at which the gas and liquid states of a substance become identical and form one phase is called the

• Critical point

• Triple point

• Melting point

• Boiling point

Multiple Choice

What does point B represent?

• Triple point

• Critical point

• Equilibrium point

• Normal melting point

Multiple Choice

What is the normal boiling point of this substance?

• 40°C

• 60°C

• 100°C

• 110°C

Multiple Choice

What phase change occurs from C to D?

• Condensation

• Vaporization

• Melting

• Sublimation

Multiple Choice

What phase would this substance be in at 0.5 atm of pressure and 100°C?

• Solid

• Liquid

• Gas

Multiple Choice

What phase change occurs from E to C?

• Sublimation

• Freezing

• Melting

• Vaporization

Multiple Choice

What phase would this substance be in at 1 atm of pressure and 80°C?

• Solid

• Liquid

• Gas

Multiple Choice

Normal freezing/melting and boiling points occur at standard pressure, which is

• 1 atm

• 5 atm

• 10 atm

• 15 atm

Multiple Choice

What is the normal boiling point of this substance?

• 0°C

• 100 °C

• -50°C

• 150°C