Question 1

Which of the following molecules would exhibit dipole-dipole intermolecular forces?

Accepted Answer

CH3Cl

Question 2

A molecule has polar bonds but a linear geometry. What can be said about its overall dipole moment?

Accepted Answer

The overall dipole moment may be zero if the bond dipoles cancel each other.

Question 3

Which equation correctly represents the dipole moment ($\mu$) of a molecule?

Accepted Answer

$\mu = q 	imes r$

Question 4

Why does water expand upon freezing, unlike most other substances?

Accepted Answer

Hydrogen bonding creates an open lattice structure in ice, making it less dense.

Question 5

Which of the following statements about hydrogen bonding is TRUE?

Accepted Answer

Hydrogen bonding occurs between a hydrogen atom bonded to F, O, or N and another F, O, or N atom in a neighboring molecule.

Question 6

Which molecule can form the greatest number of hydrogen bonds per molecule?

Accepted Answer

Water ($\mathrm{H_2O}$)

Question 7

Which of the following best explains why $\mathrm{H_2O}$ has a much higher boiling point than $\mathrm{H_2S}$, despite similar molar masses?

Accepted Answer

$\mathrm{H_2O}$ forms hydrogen bonds, which are much stronger than dipole-dipole or London dispersion forces.

Question 8

Which intermolecular force is primarily responsible for the miscibility of methanol and water?

Accepted Answer

Hydrogen bonding

Question 9

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

CO2

Question 10

Which of the following best describes the relationship between molecular polarity and boiling point for molecules of similar shape and mass?

Accepted Answer

Boiling point increases as polarity increases due to stronger dipole-dipole forces.

Question 11

Which of the following is NOT a requirement for hydrogen bonding?

Accepted Answer

Hydrogen must be bonded to carbon.

Question 12

Which intermolecular force is most important in the dissolution of sodium chloride in water?

Accepted Answer

Ion-dipole forces

Question 13

Which of the following statements about DNA structure is correct?

Accepted Answer

The nitrogenous bases pair via hydrogen bonds.

Question 14

Which of the following molecules is most likely to be miscible with n-hexane?

Accepted Answer

Carbon tetrachloride

Question 15

Which of the following molecules would have the highest boiling point due to hydrogen bonding?

Accepted Answer

Hydrogen peroxide

Question 16

Which factor does NOT affect the strength of ion-dipole interactions?

Accepted Answer

Number of covalent bonds in the ion

Question 17

Which of the following is a correct statement about intermolecular forces?

Accepted Answer

London dispersion forces are present in all molecules.

Question 18

A student mixes oil and water and observes two separate layers. Which principle explains this observation?

Accepted Answer

Like dissolves like: oil (nonpolar) and water (polar) are not miscible.

Question 19

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

Accepted Answer

Acetonitrile ($\mu = 3.9\ \mathrm{D}$)

Question 20

Which of the following is NOT a consequence of hydrogen bonding in water?

Accepted Answer

Water contracts upon freezing

Chap 12 lecture 2 study guide chem 136

Study Guide - Practice Questions