Phase Changes and Pressure

Condensation is actually...

• Drops of water vapor from the air which turned to liquid.

• Drops are liquid water coming from inside the glass.

• Drops are Mt. Dew seeping from the glass.

The average distance between molecules always increases during which phase change?

• gas to liquid

• liquid to solid

• liquid to gas

• gas to solid

What is the state of matter at Y?

• Solid

• Liquid

• Gas

• Supercritical fluid

What is point A?

• Triple point

• Critical point

• Equilibrium point

• Normal melting point

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

• Solid

• Liquid

• Gas

• Supercritical fluid

The pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg. In order, what changes occur?

• Deposition then melting

• Sublimation then melting

• Condensation then freezing

• Deposition then freezing

Describe phase changes that occurs at letter B?

• Liquid to solid

• Liquid, solid-liquid equilibrium to solid

• Solid to liquid

• Vapour to liquid

Which line segment represents the substance only in the solid state?

What is the boiling point of this substance?

• 100 ^oC

• 60 ^oC

• -60 ^oC

• 20 ^oC

Which line segment represents the heat of fusion (ΔH_fus)?