✅ 4/22/24 ... Phase Change Diagram Practice

Water exists as a _____________ at 3 mmHg and 50 °C.

• solid
• liquid
• gas
• supercritical fluid

Water exists as a _____________ at 700 mmHg and 50 °C.

• solid
• liquid
• gas
• supercritical fluid

What phase change(s) may occur at pressures below 4.58 mmHg?

• sublimation/deposition
• melting/freezing
• all phase changes are possible at these pressures
• vaporization/condensation

Which statement is true for carbon dioxide at -60 °C?

• All three phases are possible.
• It can exist as a solid or a gas, depending on pressure.
• It is a solid.
• With enough pressure it can be melted.

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

• It can never be liquified.
• It decomposes.
• It has a high pressure.
• It is a plasma.

At 10 atm, dry ice is heated from -100 °C to 30 °C.  What changes occur?

• freezing, then condensation
• melting only
• sublimation only
• melting, then boiling

What state of matter would be present if the atmosphere was 60 atm and the temperature was 700 degrees Celsius?

• solid

• liquid

• gas

Line "a" on the phase change diagram represents a phase change. What phase change is occurring when moving from point g to point b?

• melting

• freezing

• boiling

• condensation

Line "a" on the phase change diagram represents a phase change. What phase change is occurring when moving from point b to point g?

• boiling

• condensation

• freezing

• melting

Line "a" on the phase change diagram represents a phase change. What phase change is occurring when moving from point g to point b?

• boiling

• condensation

• freezing

• melting