Intermolecular Forces and Vapor Pressure

The video tutorial explains how vapor pressure is influenced by intermolecular forces. Molecules with weaker intermolecular forces have higher vapor pressures as they escape more easily to the gas phase. The video covers different types of intermolecular forces, including hydrogen bonding, dipole-dipole, and London dispersion forces, and compares molecules based on these forces. It also discusses the differences between polar and non-polar molecules and how molecular weight affects London dispersion forces. The tutorial concludes with a summary of the key points discussed.

What determines the vapor pressure of a liquid?

• The temperature of the liquid

• The strength of intermolecular forces

• The volume of the liquid

• The color of the liquid

Which type of intermolecular force is considered the strongest?

• Van der Waals forces

• Hydrogen bonding

• Dipole-dipole forces

• London dispersion forces

What type of intermolecular force is present in non-polar molecules?

• Ion-dipole forces

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonding

Which molecule would have a higher vapor pressure, CH3COOH or C2H6?

• CH3COOH

• C2H6

• Both have the same vapor pressure

• Cannot be determined

Why does CF4 have a higher vapor pressure than CHF3?

• CF4 has a larger molecular weight

• CF4 has hydrogen bonding

• CF4 is polar with dipole-dipole forces

• CF4 is non-polar with only London dispersion forces

Which molecule has stronger London dispersion forces, I2 or Br2?

• Both have the same strength

• Neither have London dispersion forces

• Br2

• I2

What is the relationship between molecular size and London dispersion forces?

• Larger molecules have weaker forces

• Larger molecules have stronger forces

• Smaller molecules have stronger forces

• Size does not affect the forces

Which of the following statements is true about vapor pressure?

• Higher vapor pressure indicates stronger intermolecular forces

• Higher vapor pressure indicates weaker intermolecular forces

• Vapor pressure is only affected by temperature

• Vapor pressure is independent of intermolecular forces

What is the main factor that allows molecules to escape from the liquid to the gas phase?

• Weak intermolecular forces

• High temperature

• Strong intermolecular forces

• High pressure

Which intermolecular force is present in polar molecules but not in non-polar molecules?

• Dipole-dipole forces

• Covalent bonding

• Hydrogen bonding

• London dispersion forces