Vapor pressure and Phase diagrams

Which substance has the weakest intermolecular forces?

• Substance A, boiling point of 75 °C

• Substance B, boiling point of 105 °C

• Substance C, boiling point of 25 °C

• Substance d, boiling point of 45 °C

Tags

NGSS.HS-PS1-3

As pressure decreases, boiling point___

• decreases
• increases
• decreases then increases
• increases then decreases

According to the reference table, what is the boiling point of ethanoic acid at 80 kPa?

• 28 ^oC

• 100^oC

• 111^oC

• 125^oC

At which temperature is the vapor pressure of ethanol equal to the vapor pressure of propanone at 35^oC?

• 35^oC

• 60^oC

• 82^oC

• 95^oC

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

• freezing
• melting
• boiling
• sublimation

When you increase your altitude, the air pressure 

• increases
• decreases
• stays the same

What is the vapor pressure of propanone at 50^oC?

• 37 kPa

• 50 kPa

• 83 kPa

• 101 kPa

Tags

NGSS.HS-PS3-2

Liquids with weak intermolecular forces

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

If you wanted to know the boiling point at STP, you would find where the curve intersects with

• 101.3kpa

• 1 atm

• 273K

• the y axis

• you cannot tell

Tags

NGSS.HS-PS3-4

Which substance has the lowest boiling point at atmospheric pressure?

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-1