Intermolecular forces

NH₃ molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

BH₃ molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

SO₂ molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

HF molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

HCl molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

BeCl₂ molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

CH₂Cl₂ molecules can form...

• London dispersion forces

• Dipole-dipole forces

• Hydrogen bonds

Which one has the highest boiling point?

• CH₄

• SO₂

• H₂O

Answer explanation

H₂O has the highest boiling point because it can form the strongest type of intermolecular force - HYDROGEN BONDING.

Which one has the highest boiling point?

• BeCl₂

• CO₂

• SF₄

Answer explanation

SF₄ has the highest boiling point because it can form stronger dipole-dipole forces than BeCl₂ and CO₂'s London dispersion forces.

Tags

NGSS.HS-PS1-3

Which of the following non-polar molecules has the highest boiling point? (Refer Page 15 - 17 of Intermolecular Forces)

• CH₄; molar mass = 16.04 g/mol

• CCl₄; molar mass = 153.82 g/mol

• PF₅; molar mass = 125.966 g/mol

• Rn; molar mass = 222.01758 g/mol

Answer explanation

The bigger the molar mass, the more electron a species has.

The more electrons, the more distance over which

they can move, the bigger the possible temporary

dipoles and therefore the bigger the dispersion

forces.

London dispersion forces strength is stronger.