Types of IMFs and Properties

Hydrogen bonding occurs when a hydrogen atom bonded to N, O, or F is attracted to another molecule's N, O or F atom. Which of the following can participate in hydrogen bonding?

• CBr₄

• NO₂

• H₂S

• NH₃

All matter can participate in London forces, but dipole-dipole and hydrogen bonding are so much stronger that when they are present, we can effectively ignore London forces. Which of these can ONLY participate in London forces?

• I₂

• NH₃

• OCl₂

• CH₃Cl

A Lewis structure for acetone is shown above. What type of intermolecular forces will be present between the molecules of acetone in a pure sample of acetone? Select all that apply.

• ion-dipole attractions

• dipole-dipole attractions

• hydrogen bonding

• London forces

The weaker the intermolecular forces of a substance, the _____________ the boiling point.

• higher

• lower

Which of the following explains the very high melting and boiling point of water?

• Strong dipole-dipole attractions between water molecules

• Strong hydrogen bonds between water molecules

• London dispersion forces between water molecules

• Dipole-induced dipole attractions between water molecules

London forces are stronger in more massive atoms or molecules, and weaker in less massive atoms or molecules. Which of the following has the strongest London forces?

• F₂

• Br₂

• I₂

• Cl₂

Which of these molecules can participate in dipole-dipole attractions? Select all that apply.

• Br₂

• P₄

• I₂

• PCl₃

• CO

Which of the following molecules would have the lowest boiling point?

• CH₄
• C₂H₆
• C₃H₈
• C₄H₁₀

Propane is a gas at room temperature, while bromine is a liquid at room temperature. Which statement correctly explains these observations?

• Bromine has weaker intermolecular forces than propane does

• Bromine has greater molecular polarity than propane does

• Bromine has weaker molecular polarity than propane does

• Bromine has stronger intermolecular forces than propane does

Which intermolecular force between molecules of CCl₂H₂ is the strongest?

• dispersion forces

• dipole-dipole forces

• hydrogen bonding

• none of the above