Vapor Pressure and Boiling

The lower the boiling point, the ___ the intermolecular forces.

• stronger
• weaker

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When the atmospheric pressure equals the equilibrium vapor pressure ___ occurs.

• freezing
• melting
• boiling
• sublimation

Tags

NGSS.MS-PS1-4

If the rate of melting equals the rate of freezing...

• there is more liquid
• there is more solid
• the system is in equilibrium
•  the system is working towards equilibrium

Tags

NGSS.MS-PS1-4

During a phase change, the temperature

• increases
• decreases
• fluctuates
• stays the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The strength of intermolecular forces varies between liquids, therefore they will have

• different equilibrium vapor pressure
• the same equilibrium vapor pressure
• different temperatures
• the same amount of kinetic energy

Tags

NGSS.HS-PS1-3

Liquids with weak intermolecular forces

• contain a lot of kinetic energy
• easily evaporate
• cannot diffuse
• freeze easily

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is the normal boiling point of water

• 0^oC

• 100^oF

• 50^oC

• 100^oC

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

At which temperature is the vapor pressure of ethanol equal to 80 kPa? Use Table H.

• 48^oC

• 73^oC

• 80^oC

• 101^oC

Which compound has the lowest vapor pressure at 50°C? Use Table H.

• ethanoic acid

• ethanol

• propanone

• water

Evaporation occurs when water changes into

• ice

• liquid

• crystals

• vapor