Q: A sample of ethanol (C\_2H\_5OH) and a sample of dimethyl ether (CH\_3OCH\_3) have similar molar masses. Why does ethanol have a much higher boiling point?

Ethanol forms hydrogen bonds, which are much stronger than the dipole-dipole forces in dimethyl ether.

Q: Which of the following best describes the relationship between kinetic energy and intermolecular forces in determining the physical state of a substance?

Kinetic energy moves particles apart, while intermolecular forces hold them together.

Q: Which statement correctly ranks the relative strengths of intermolecular forces?

$\text{Ion-dipole} > \text{H-bond} > \text{Dipole-dipole} > \text{London dispersion}$

Question 1

Which of the following statements best explains why geckos are able to stick to surfaces?

Accepted Answer

Geckos exploit London dispersion forces between the tiny hairs on their feet and the surface.

Question 2

Which of the following molecules would you expect to have the highest boiling point due to intermolecular forces?

Accepted Answer

NH\_3 (ammonia)

Question 3

What is the main factor that increases the strength of London dispersion forces in a molecule?

Accepted Answer

The number of electrons and the molecular surface area.

Question 4

Rank the following substances from weakest to strongest London dispersion forces: F\_2, Cl\_2, Br\_2.

Accepted Answer

F\_2 < Cl\_2 < Br\_2

Question 5

Which of the following is NOT a type of intermolecular force?

Accepted Answer

Covalent bonding

Question 6

A sample of ethanol (C\_2H\_5OH) and a sample of dimethyl ether (CH\_3OCH\_3) have similar molar masses. Why does ethanol have a much higher boiling point?

Accepted Answer

Ethanol forms hydrogen bonds, which are much stronger than the dipole-dipole forces in dimethyl ether.

Question 7

Which of the following best describes the relationship between kinetic energy and intermolecular forces in determining the physical state of a substance?

Accepted Answer

Kinetic energy moves particles apart, while intermolecular forces hold them together.

Question 8

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

Accepted Answer

NH\_3 (ammonia)

Question 9

Which intermolecular force is primarily responsible for the dissolution of table salt (NaCl) in water?

Accepted Answer

Ion-dipole forces

Question 10

Which statement correctly ranks the relative strengths of intermolecular forces?

Accepted Answer

$	ext{Ion-dipole} > 	ext{H-bond} > 	ext{Dipole-dipole} > 	ext{London dispersion}$

Question 11

Which of the following molecules will have the strongest dipole-dipole interactions?

Accepted Answer

CH\_2O (formaldehyde)

Question 12

Why do molecules with greater surface area have stronger London dispersion forces?

Accepted Answer

They allow for more extensive contact between molecules, increasing the strength of induced dipoles.

Question 13

Which of the following is required for a molecule to act as a hydrogen bond donor?

Accepted Answer

It must have a hydrogen atom covalently bonded to N, O, or F.

Question 14

Which of the following best explains why boiling point can be used as an indicator of the strength of intermolecular forces?

Accepted Answer

Boiling requires breaking intermolecular forces, so a higher boiling point means stronger intermolecular forces.

Question 15

Which of the following molecules is most likely to exhibit only London dispersion forces?

Accepted Answer

CO\_2

Question 16

A protein's secondary structure is stabilized primarily by which type of intermolecular force?

Accepted Answer

Hydrogen bonding

Question 17

Which of the following molecules can act as both a hydrogen bond donor and acceptor?

Accepted Answer

H\_2O

Question 18

Which of the following factors does NOT increase the strength of London dispersion forces?

Accepted Answer

Increasing the polarity of the molecule

Question 19

Which of the following best describes an ion-dipole interaction?

Accepted Answer

An attraction between an ion and a polar molecule

Question 20

Which of the following statements is true regarding intermolecular forces and covalent bonds?

Accepted Answer

Intermolecular forces involve smaller charges acting over longer distances compared to covalent bonds.

Intermolecular Forces: Liquids, Solids, and Their Properties (Ch. 11.3)

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