IB SL CHEM – IMFs & Volatility

Which of the following statements about the relationship between boiling points and intermolecular forces is correct?

• Substances with stronger intermolecular forces generally have lower boiling points.

• Substances with weaker intermolecular forces generally have higher boiling points.

• There is no consistent relationship between intermolecular forces and boiling points.

• Boiling points are primarily determined by the molecular weight.

Which of the following substances is expected to have the highest boiling point?

• Ne (neon)

• HCl (hydrochloric acid)

• N₂ (nitrogen gas)

• H₂O (water)

In general, which type of intermolecular force is the strongest and contributes most significantly to high boiling points?

• London dispersion forces

• Dipole-dipole interactions

• Hydrogen bonding

• Ionic bonding

Which of the following substances has the highest boiling point due to hydrogen bonding?

• HF (hydrogen fluoride)

• HBr (hydrogen bromide)

• HI (hydrogen iodide)

• HCl (hydrogen chloride)

Which of the following compounds will have the lowest boiling point?

• CH₄ (methane)

• CCl₄ (carbon tetrachloride)

• CH₃Cl (methyl chloride)

• CH₃OH (methanol)

When comparing two compounds with similar molecular weights, which one is expected to have a higher boiling point if it can form hydrogen bonds?

• The one with hydrogen bonding

• The one without hydrogen bonding

• There will be no significant difference in boiling points.

Which of the following molecules has the highest boiling point in its group?

• NH₃ (ammonia)

• PH₃ (phosphine)

• AsH₃ (arsine)

• SbH₃ (stibine)

What is the primary reason that noble gases, such as helium (He) and neon (Ne), have extremely low boiling points?

• They have strong covalent bonds.

• They are diatomic molecules.

• They lack intermolecular forces.

• They are highly reactive with other substances.

Which of the following substances is expected to have the highest boiling point due to strong London dispersion forces?

• H₂ (hydrogen gas)

• N₂ (nitrogen gas)

• O₂ (oxygen gas)

• Cl₂ (chlorine gas)

The boiling point of a substance is generally higher when:

• The molecules are larger.

• The molecules are smaller.

• The substance is a gas at room temperature.

• The substance is nonpolar.