Question 1

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

CH3OH

Question 2

Arrange the following molecules in order of increasing strength of intermolecular forces: HF, CO2, PH3.

Accepted Answer

$$\mathrm{CO_2$ \u003c PH_3$ \u003c HF}$$

Question 3

Which type of intermolecular force is dominant in carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

Dispersion forces

Question 4

Which of the following substances will have the highest boiling point?

Accepted Answer

$$\mathrm{$$BaCl_2$$}$$

Question 5

Why do ionic compounds generally have higher melting and boiling points than covalent compounds?

Accepted Answer

Because ionic bonds are stronger than intermolecular forces in covalent compounds.

Question 6

Which of the following best explains why viscosity increases as the strength of intermolecular forces increases?

Accepted Answer

Stronger intermolecular forces make it harder for molecules to move past each other.

Question 7

A liquid forms a concave meniscus in a glass tube. What does this indicate about the forces present?

Accepted Answer

Adhesive forces are greater than cohesive forces.

Question 8

Which of the following will have the higher viscosity: acetone ($$\mathrm{CH_3COCH_3}) or $$ethanol ($$\mathrm{CH_3CH_2OH}$$)?

Accepted Answer

Ethanol ($$\mathrm{CH_3CH_2OH})$$

Question 9

Which of the following best describes capillary action?

Accepted Answer

The flow of a liquid through a narrow space due to the combined effects of cohesion, adhesion, and surface tension.

Question 10

Which of the following molecules will have the highest surface tension: BrF5 or SbCl5?

Accepted Answer

BrF5

Question 11

Which of the following statements about surface tension is correct?

Accepted Answer

Surface tension increases as the strength of intermolecular forces increases.

Question 12

Which of the following best explains why water has a higher boiling point than methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Water forms hydrogen bonds, which are stronger than the dispersion forces in methane.

Question 13

Which of the following is an example of an ion-dipole interaction?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl}) $$dissolving in water

Question 14

Which of the following phase changes requires energy to be added to the system?

Accepted Answer

Melting

Question 15

Which of the following statements about the relationship between temperature and viscosity is correct?

Accepted Answer

As temperature increases, viscosity decreases.

Question 16

Which of the following best describes the dominant intermolecular force in hydrogen fluoride ($$\mathrm{HF}$$)?

Accepted Answer

Hydrogen bonding

Question 17

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

Accepted Answer

$$\mathrm{Ne}$$

Question 18

Which of the following best explains why mercury forms beads on a surface, as shown in the image?

Accepted Answer

Cohesive forces between mercury atoms are stronger than adhesive forces with the surface.

Question 19

Which of the following is NOT a consequence of increasing intermolecular force strength?

Accepted Answer

Lower boiling point

Question 20

Which of the following best describes the effect of molecular shape on viscosity?

Accepted Answer

Larger and more complex molecules generally have higher viscosity due to increased entanglement and intermolecular forces.

Intermolecular Forces and Their Effects on Physical Properties

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