Intermolecular Forces

The structure of a soap (surfactant) molecule is given below. Looking at the structure, deduce what solvent(s) the molecule will be soluble in.

• Water and oil

• Water

• Oil

• Neither

You have four different samples of compounds that are liquids at room temperature: BCl₃, CCl₄, NCl₃ and OCl₂. Identify which correct pairs of molecules are capable of forming a solution.

• NCl₃ with OCl₂ and BCl₃ with CCl₄

• BCl₃ with NCl₃ and CCl₄ with OCl₂

• BCl₃ with OCl₂ and NCl₃ with CCl₄

• All of these molecules are capable of forming a solution.

When graphite is used as a writing material, individual layers of graphite transfer from the pencil to the page. What interaction has to be overcome in order for this transfer to occur?

• London dispersion forces

• Dipole–dipole forces

• Covalent bonds

• Giant Covalent bonds

You have samples of four different molecular compounds: ammonia (NH₃), methane (CH₄), silicon tetrahydride (SiH₄) and phosphorus trihydride (PH₃).

The compound with the highest boiling point is

• ammonia (NH₃)

• methane (CH₄)

• silicon tetrahydride (SiH₄)

• phosphorus trihydride (PH₃)

You have samples of four different molecular compounds: ammonia (NH₃), methane (CH₄), silicon tetrahydride (SiH₄) and phosphorus trihydride (PH₃).

The compound with the lowest boiling point is

• ammonia (NH₃)

• methane (CH₄)

• silicon tetrahydride (SiH₄)

• phosphorus trihydride (PH₃)

Identify the correct statement regarding London dispersion forces and dipole–dipole forces. 

• London dispersion forces involve both temporary and induced dipoles, whereas dipole–dipole forces involve a permanent dipole.

• Dipole–dipole forces involve both temporary and induced dipoles, whereas London dispersion forces involve a permanent dipole.

• London dispersion forces involve both temporary and permanent dipoles, whereas dipole–dipole forces involve an induced dipole.

• London dispersion forces involve a temporary dipole, whereas dipole–dipole forces involve both induced and permanent dipoles.

Which intermolecular forces exist between the CO₂ molecules in dry ice, CO₂ (s)?

• London dispersion forces

• Covalent bonds

• Dipole-dipole interactions 

• Hydrogen bonds