Intermolecular Forces and Properties Quiz

Which of the following intermolecular forces is present in all molecules, regardless of polarity?

• Dipole-dipole forces

• Hydrogen bonding

• London dispersion forces

• Ionic bonding

Which type of force is responsible for the high boiling point of water?

• London dispersion forces

• Hydrogen bonding

• Dipole-dipole forces

• Covalent bonding

What happens to the viscosity of a liquid when temperature increases?

• It increases

• It decreases

• It remains the same

• It depends on the pressure

Answer explanation

When temperature increases, molecules move faster, reducing their tendency to stick together, which lowers viscosity.

What happens to vapor pressure when temperature increases?

• It increases

• It decreases

• It stays constant

• It fluctuates randomly

Answer explanation

Higher temperature means more molecules escape into the gas phase, increasing vapor pressure.

Which property allows liquids to resist external force due to cohesive forces among molecules?

• Viscosity

• Volatility

• Surface tension

• Capillarity

Answer explanation

Surface tension is caused by cohesion (molecules sticking together), allowing liquids to form drops instead of spreading out.

Which phenomenon explains why water can rise in a thin glass tube without external force?

• Surface tension

• Capillary action

• Sublimation

• Vaporization

Answer explanation

happens due to adhesion (water sticks to glass) and cohesion (water molecules stick to each other).

Which of the following liquids is expected to have the highest surface tension?

• Ethanol

• Water

• Acetone

• Gasoline

Answer explanation

Water has strong hydrogen bonding, giving it the highest surface tension compared to other liquids.

What happens to the boiling point of a liquid if external pressure decreases?

• It increases

• It decreases

• It stays constant

• It becomes unpredictable

Answer explanation

Lower external pressure means less energy is needed to convert liquid to gas, so the boiling point drops.

Which of the following terms describes the ability of a substance to change directly from solid to gas?

• Sublimation

• Evaporation

• Condensation

• Deposition

Which of the following factors affects the volatility of a liquid?

• Intermolecular forces

• Molar mass

• Temperature

• All of the above