Chapter 11 Quiz

1. Which of the following molecules displays hydrogen bonding?

HF

CH3CH2CH3

H2S

NF3

2. Since water tends to form spherical droplets, we say it has a high

Surface tension

Melting point

Dropletization

Dispersion force

3. Which of the following substances would exhibit ionic forces?

NF3

AlF3

SiF4

CF4

4. Which of the following statements is INCORRECT?

Liquids with weak intermolecular forces tend to have high vapor pressures.

Liquids with weak intermolecular forces tend to have high boiling points.

Liquids with strong intermolecular forces tend to have high surface tension.

Cohesion forces refer to intermolecular attractions between like molecules.

5. Rank the following according to increasing boiling point: He, Kr, H₂O, NaCl

He < Kr < NaCl < H2O

Kr < He < NaCl < H2O

He < Kr < H2O < NaCl

NaCl < H2O < Kr < He

6. Which of these substances would exhibit the WEAKEST dispersion forces?

CO2

SiF4

XeF4

O2

7. Of the four major intermolecular interactions, which one is normally considered the STRONGEST?

Ionic attractions

London dispersion forces

Dipole-dipole forces

Hydrogen bonds

8. Which of the following does NOT apply to liquid carbon tetrachloride, CCl4 (l) ?

Has a definite volume and assumes the shape of its container

Is a nonpolar molecule

Has dipole-dipole interactions

Exhibits dispersion forces

9. At temperatures and pressures higher than the critical point for a substance, only a ____ can exist.

Liquid

Plasma

Supercritical fluid

Solid

10. Which of the following molecules exhibits dipole-dipole interactions?

CO2

H2S

BeH2

N2

11. Which of the following statements about phase diagrams is FALSE?

The line separating liquid and vapor represents boiling.

The line separating solid and vapor represents sublimation.

The point at which all three phases coexist is called the critical point.

It is possible for a substance to have more than three phases.

12. Arrange the following according to increasing melting point: CBr₄, Ne, CH₄, CI₄, CF₄

CBr4 < CF4 < CI4 < CH4 < Ne

CI4 < CBr4 < CF4 < CH4 < Ne

Ne < CI4 < CBr4 < CF4 < CH4

Ne < CH4 < CF4 < CBr4 < CI4

13. According to the heating curve for water,

The temperature of water rises as it is boiled.

The temperature of water rises as it freezes.

The temperature of water goes down when it freezes.

The temperature of water remains constant as it melts.

14. Kr has stronger London dispersion forces than Ne because

Kr has more elections than Ne.

Kr has a greater mass than Ne.

Kr has a greater shielding effect than Ne.

All of the above

15. Which of the following is an INCORRECT association?

H2 (s) --> H2 (g) sublimation

H2O (l) --> H2O (s) melting

CH3OH (l) --> CH3OH (g) condensation

CH4 (g) --> CH4 (s) deposition