[NEW] Quiz 5 Physical Science

Which type of intermolecular force is considered the weakest?

• Hydrogen bonding

• Dipole-dipole forces

• London dispersion forces

• Ion-dipole forces

Why do substances with strong intermolecular forces have higher boiling points?

• They require more energy to separate the molecules

• They have higher molecular weights

• They evaporate more easily

• They contain more atoms

A scientist observes that Liquid A evaporates faster than Liquid B. What does this suggest?

• Liquid A has weaker intermolecular forces

• Liquid A has stronger intermolecular forces

• Liquid A is more polar than Liquid B

• Liquid A has more hydrogen bonds

Which molecule is likely to have the strongest intermolecular forces?

• CH₄

• NH₃

• CO₂

• HCl

A researcher wants to create a liquid with a high boiling point for industrial cooling. Which force should be strongest?

• London dispersion forces

• Dipole-dipole interactions

• Hydrogen bonding

• Ion-dipole forces

Which property of a substance is directly influenced by the strength of its intermolecular forces?

• Color

• Boiling point

• Electrical conductivity

• Molar mass

Why do substances with strong intermolecular forces tend to have high surface tension?

• Their molecules are tightly attracted, reducing surface area

• Their molecules easily separate, making the surface more flexible

• Their molecules repel each other, stretching the surface

• Their molecules are unaffected by intermolecular forces at the surface

A scientist compares two liquids and finds that one evaporates much faster than the other. What can be inferred?

• The slower evaporating liquid has weaker intermolecular forces

• The faster evaporating liquid has weaker intermolecular forces

• The two liquids must have the same intermolecular forces

• The faster evaporating liquid must be heavier

Which of the following substances would likely have the highest boiling point?

• CH₄ (Methane)

• NH₃ (Ammonia)

• CO₂ (Carbon dioxide)

• O₂ (Oxygen)

A student claims that all substances with hydrogen bonding have higher boiling points than those with only London dispersion forces. Is this always correct?

• Yes, because hydrogen bonding is the strongest intermolecular force

• No, because some large nonpolar molecules can have high boiling points

• Yes, because London dispersion forces are always the weakest

• No, because boiling point depends only on molecular weight