Vapor Pressure

The normal boiling point of ethanol is

• 79^οC

• 100^οC

• 0^οC

• 273^οC

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

Based on Reference Table H, which sample has the highest vapor pressure?

• water at 20°C

• ethanol at 50°C

• water at 80°C

• ethanol at 65°C

Using your knowledge of chemistry and the info in Ref Table H, which statement concerning propanone and water at 50°C is true? *vp= vapor pressure *imf= intermolecular forces

• propanone has a higher vp and stronger imf than water

• propanone has a higher vp and weaker imf than water

• propanone has a lower vp and stronger imf than water

• propanone has a lower vp and weaker imf than water

Which liquid has the highest vapor pressure at 75°C?

• ethanoic acid

• propanone

• ethanol

• water

According to Reference Table H, what is the vapor pressure of propanone at 45°C?

• 22 kPa

• 70 kPa

• 33 kPa

• 98 kPa

The boiling point of a pure substance is defined as the temperature at which

• the kinetic energy of the molecules begins to increase

• the vapor pressure equals the external pressure

• the liquid phase can be completely evaporated

• the molecules of the substance break apart

When the vapor pressure of water is 30kPa, the temperature of the water is

• 20°C

• 70°C

• 40°C

• 100°C

Which model represents a LOWER Vapor Pressure?

• A

• B

Tags

NGSS.HS-PS3-2

Which of the following substances has the highest vapor pressure at room temperature?

• A) Water

• B) Ethanol

• C) Propanone

• D) Ethanoic acid

At what temperature does the vapor pressure of water equal 101.3 kPa?

• A) 0°C

• B) 50°C

• C) 100°C

• D) 150°C