Question 1

Which of the following statements best explains why water ($$\mathrm{H_2O}) $$has a much higher boiling point than hydrogen sulfide ($$\mathrm{H_2S}$$)?

Accepted Answer

Water molecules form hydrogen bonds, which are much stronger than the dipole-dipole forces in hydrogen sulfide.

Question 2

Rank the following compounds from lowest to highest surface tension: $$\mathrm{C_2H_6}$$, $$\mathrm{CH_3NH_2}$$, $$\mathrm{KCl}$$, $$\mathrm{H_3C-O-CH_3$}. $$Which compound has the highest surface tension and why?

Accepted Answer

$$\mathrm{KCl}$$; it has the strongest ionic forces among the options, leading to the highest surface tension.

Question 3

Which of the following molecules is nonpolar and experiences only London dispersion forces as its dominant intermolecular force?

Accepted Answer

$$\mathrm{$$CCl_4$$}$$

Question 4

Given the following compounds, which one would you expect to have the lowest vapor pressure at room temperature? $$\mathrm{I_2$}$$, $$\mathrm{H_2S}$$, $$\mathrm{H_2O}$$

Accepted Answer

$$\mathrm{H_2O}$$, because it has the strongest intermolecular forces (hydrogen bonding), resulting in the lowest vapor pressure.

Question 5

Which of the following pairs is correctly matched with the dominant intermolecular force present in the pure substance?

Accepted Answer

$$\mathrm{NaCl}$$: Ionic bonding

Question 6

A student is comparing the viscosity of $$\mathrm{C_7H_{16}}$$ and $$\mathrm{C_5H_{12}}. $$Which compound is expected to have higher viscosity and why?

Accepted Answer

$$\mathrm{C_7H_{16}}$$; it has a longer carbon chain, leading to stronger London dispersion forces and higher viscosity.

Question 7

Which of the following correctly ranks $$\mathrm{I_2$}$$, $$\mathrm{H_2S}$$, and $$\mathrm{H_2O}$$ from weakest to strongest intermolecular forces?

Accepted Answer

$$\mathrm{I_2$} \u003c \mathrm{H_2S} \u003c \mathrm{H_2O}$$

Question 8

Which molecule is polar and has hydrogen bonding as its strongest intermolecular force?

Accepted Answer

$$\mathrm{CH_3NH_2}$$

Question 9

A hospital stores liquid $$\mathrm{H_2O}$$ and $$\mathrm{H_2S} in $$separate containers. Which liquid will have a higher vapor pressure at the same temperature, and why?

Accepted Answer

$$\mathrm{H_2S}$$; it has weaker intermolecular forces, so more molecules escape into the vapor phase.

Question 10

Which of the following compounds is nonpolar and has only London dispersion forces as its dominant intermolecular force?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 11

Which of the following statements about intermolecular forces and physical properties is correct?

Accepted Answer

A substance with strong intermolecular forces will have a high boiling point and low vapor pressure.

Question 12

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

Accepted Answer

$$\mathrm{KCl}$$

Question 13

Which of the following best explains why $$\mathrm{CH_3CH_2OH}$$ has a higher viscosity than $$\mathrm{H_3C-O-CH_3$}$$?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$ can form hydrogen bonds, which are stronger than the dipole-dipole forces in $$\mathrm{H_3C-O-CH_3$}.$$

Question 14

Which of the following compounds is polar but does NOT exhibit hydrogen bonding as its strongest intermolecular force?

Accepted Answer

$$\mathrm{CH_3Br}$$

Question 15

Which of the following correctly matches the molecule with its polarity and dominant intermolecular force?

Accepted Answer

$$\mathrm{CO_2$}$$: Nonpolar, London dispersion forces

Question 16

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

Accepted Answer

$$\mathrm{SO_2$}$$

Question 17

Which of the following statements best explains why $$\mathrm{$$CBr_4$$}$$ has a higher viscosity than $$\mathrm{$$CCl_4$$}$$?

Accepted Answer

$$\mathrm{$$CBr_4$$}$$ has a higher molecular mass, leading to stronger London dispersion forces and higher viscosity.

Question 18

Which of the following correctly ranks the compounds $$\mathrm{HBr}$$, $$\mathrm{O_2$}$$, $$\mathrm{CH_3OH}$$, and $$\mathrm{NaCl}$$ from strongest to weakest intermolecular forces?

Accepted Answer

$$\mathrm{NaCl} \u003e \mathrm{CH_3OH} \u003e \mathrm{HBr} \u003e \mathrm{O_2$}$$

Question 19

Which of the following molecules is nonpolar and would have the lowest boiling point among the options?

Accepted Answer

$$\mathrm{C_2H_6}$$

Question 20

Which of the following best explains why $$\mathrm{H_2O}$$ has a higher surface tension than $$\mathrm{H_2S}$$?

Accepted Answer

$$\mathrm{H_2O}$$ forms hydrogen bonds, which are much stronger than the dipole-dipole forces in $$\mathrm{H_2S}.$$

Intermolecular Forces and Physical Properties: Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards