Topic 4.4 - Intermolecular Forces

Select which of the following molecular species may form hydrogen bonds with water (H₂O) molecules:

• CH₃CH₂CH₂CH₃

• NH₃C₂H₄

• PH₃

• CH₄

Select the molecular species that contain van der Waals forces:

• Ar

• CH₃Cl

• CH₃CH₂CH₂OH

• CH₃CH₂OCH₂CH₃

What are the intermolecular forces that are found between CH₂F₂ molecules?

• London forces

• Only hydrogen bonding

• Van der Waals forces

• London forces, dipole-dipole forces, and hydrogen bonding.

Electronegativities of the following elements: H (χ_p=2.2); C (χ_p=2.6); O (χ_p=3.4); Cl (χ_p=3.2).

Which of the following bonds is the most polar?

• O-H

• H-Cl

• C-H

• C-O

Out of ammonia (NH₃), propane (CH₃CH₂CH₃) and ethanoic acid (CH₃COOH), only ___ of the mentioned species can form hydrogen bonds with water (H₂O) molecules.

Which of the following molecular species is considered the most volatile (least amount of intermolecular forces)?

• CCl₄

• CF₄

• C₆H₁₄

• CBr₄

• CH₄

C₁₂H₂₆ molecules are attracted to one another or held together through ___ .

Which of the following molecular species has the greatest boiling point?

• O₂

• Cl₂

• Br₂

• H₂

• N₂

Select the chemical species that only contain London (dispersion) forces as its only intermolecular force:

• HCl

• NH₃

• CH₃OH

• H₂S

• Kr

Which intermolecular force is responsible for the difference between the boiling points of ICl (97^oC) and Br₂ (59^oC)?

• London (dispersion) forces

• Dipole-dipole forces

• Van der Waals forces

• Hydrogen bonding

• All of the above