Question 1

Which alkane compound has the highest boiling point?

Accepted Answer

A) C4H10 
B) C5H12 
C) C6H14 
D) C7H16 
E) C8H18 
A) C4H10 
B) C5H12 
C) C6H14 
D) C7H16 
E) C8H18

Question 2

Freezing occurs in going from region ________

Accepted Answer

A) I to II. 
B) II to I. 
C) II to III. 
D) III to II. 
E) III to I. 
A) I to II. 
B) II to I. 
C) II to III. 
D) III to II. 
E) III to I.

Question 3

Identify all of the intermolecular forces present in a pure sample of the following molecules.
Br2, CH3OCH3, and NH3

Accepted Answer

Br₂: dispersion forces only CH₃O

Question 4

Which molecule does not exhibit hydrogen bonding?

Accepted Answer

A) HF 
B) CH3NH2 
C) CH3OH 
D) (CH3)3N 
E) CH3CH2OH 
A) HF 
B) CH3NH2 
C) CH3OH 
D) (CH3)3N 
E) CH3CH2OH

Question 5

At the critical point, ________

Accepted Answer

A) all the liquid has evaporated. 
B) the densities of the solid and the liquid are the same. 
C) the densities of the solid and the gas are the same. 
D) the densities of the gas and the liquid are the same. 
E) a critical mass has been reached. 
A) all the liquid has evaporated. 
B) the densities of the solid and the liquid are the same. 
C) the densities of the solid and the gas are the same. 
D) the densities of the gas and the liquid are the same. 
E) a critical mass has been reached.

Question 6

Explain why the boiling point of nitrogen (N2, 77 K) is much lower than that of carbon monoxide (CO, 84 K), even though both have the same number of electrons and protons and nearly the same mass.

Accepted Answer

CO is polar, and the

Question 7

Dispersion forces are due to ________

Accepted Answer

A) permanent dipoles. 
B) temporary dipoles. 
C) hydrogen bonding. 
D) ionic interactions. 
E) protons. 
A) permanent dipoles. 
B) temporary dipoles. 
C) hydrogen bonding. 
D) ionic interactions. 
E) protons.

Question 8

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C6H14?

Accepted Answer

A) CH3OH 
B) CH3CH2OH 
C) CH3CH2CH2OH 
D) CH3CH2CH2CH2OH 
E) CH3CH2CH2CH2CH2OH 
A) CH3OH 
B) CH3CH2OH 
C) CH3CH2CH2OH 
D) CH3CH2CH2CH2OH 
E) CH3CH2CH2CH2CH2OH

Question 9

Which of the following compounds is not capable of hydrogen bonding?

Accepted Answer

A) HF 
B) CH3OH 
C) CH3F 
D) CH3COOH 
E) (CH3)2NH 
A) HF 
B) CH3OH 
C) CH3F 
D) CH3COOH 
E) (CH3)2NH

Question 10

Arrange the following compounds in order of increasing dispersion interactions: CCl4, CH4, C3H8.

Accepted Answer

A) CH4 F1F1F1S1F1F1F10 C3H8 F1F1F1S1F1F1F10 CCl4 
B) CCl4 F1F1F1S1F1F1F10 CH4 F1F1F1S1F1F1F10 C3H8 
C) C3H8 F1F1F1S1F1F1F10 CH4 F1F1F1S1F1F1F10 CCl4 
D) CCl4 F1F1F1S1F1F1F10 C3H8 F1F1F1S1F1F1F10 CH4 
E) CH4 F1F1F1S1F1F1F10 CCl4 F1F1F1S1F1F1F10 C3H8 
A) CH4 F1F1F1S1F1F1F10 C3H8 F1F1F1S1F1F1F10 CCl4 
B) CCl4 F1F1F1S1F1F1F10 CH4 F1F1F1S1F1F1F10 C3H8 
C) C3H8 F1F1F1S1F1F1F10 CH4 F1F1F1S1F1F1F10 CCl4 
D) CCl4 F1F1F1S1F1F1F10 C3H8 F1F1F1S1F1F1F10 CH4 
E) CH4 F1F1F1S1F1F1F10 CCl4 F1F1F1S1F1F1F10 C3H8

Question 11

Carbon dioxide is being used as an environmentally safe liquid solvent for reactions. If the reaction is run at a temperature of 15oC, what must the minimum pressure of the reaction vessel be? The phase diagram for carbon dioxide is shown below.

Accepted Answer

A) about 1 atm 
B) about 10 atm 
C) about 100 atm 
D) about 500 atm 
E) about 5 atm 
A) about 1 atm 
B) about 10 atm 
C) about 100 atm 
D) about 500 atm 
E) about 5 atm

Question 12

Which of the following gases would you expect to have the largest van der Waals a constant value?

Accepted Answer

A) Kr 
B) N2 
C) O2 
D) H2 
E) Ne 
A) Kr 
B) N2 
C) O2 
D) H2 
E) Ne

Question 13

Based on their boiling points, which of the following compounds has the largest dipole-dipole interaction?

Accepted Answer

A) propane (231 K) 
B) dimethyl ether (248 K) 
C) acetonitrile (355 K) 
D) methyl chloride (249 K) 
E) butane (135 K) 
A) propane (231 K) 
B) dimethyl ether (248 K) 
C) acetonitrile (355 K) 
D) methyl chloride (249 K) 
E) butane (135 K)

Question 14

Melting occurs in going from region ________

Accepted Answer

A) I to II. 
B) I to III. 
C) II to III. 
D) III to II. 
E) III to I. 
A) I to II. 
B) I to III. 
C) II to III. 
D) III to II. 
E) III to I.

Question 15

Which molecule has the largest dipole?

Accepted Answer

A) methane (CH4) 
B) ammonia (NH3) 
C) sulfur trioxide (SO3) 
D) carbon dioxide (CO2) 
E) ethylene (C2H4) 
A) methane (CH4) 
B) ammonia (NH3) 
C) sulfur trioxide (SO3) 
D) carbon dioxide (CO2) 
E) ethylene (C2H4)

Question 16

Which of the following nonpolar molecules will have the highest boiling point?

Accepted Answer

A) CO2 
B) C6H6 (benzene) 
C) C6F6 (hexafluorobenzene) 
D) C2H2 
E) CF4 
A) CO2 
B) C6H6 (benzene) 
C) C6F6 (hexafluorobenzene) 
D) C2H2 
E) CF4

Question 17

What does the line indicated by the arrow in the following phase diagram represent?

Accepted Answer

A) solid-liquid boundary 
B) solid-gas boundary 
C) liquid-gas boundary 
D) triple point 
E) solid-solid boundary 
A) solid-liquid boundary 
B) solid-gas boundary 
C) liquid-gas boundary 
D) triple point 
E) solid-solid boundary

Question 18

Which intermolecular force is caused by an instantaneous dipole generated by close contact with other atoms or molecules?

Accepted Answer

A) ion-ion forces 
B) ion-dipole forces 
C) hydrogen bonding 
D) dipole-dipole forces 
E) dispersion forces 
A) ion-ion forces 
B) ion-dipole forces 
C) hydrogen bonding 
D) dipole-dipole forces 
E) dispersion forces

Question 19

On the phase diagram below, identify the normal boiling point.

Accepted Answer

A) VI 
B) V 
C) VII 
D) IV 
E) III 
A) VI 
B) V 
C) VII 
D) IV 
E) III

Question 20

Identify which of the following alkanes has a) the highest vapor pressure and b) the highest boiling point. Briefly explain your reasoning.
C4H10, C5H12, C6H14, and C7H16

Accepted Answer

Highest vapor pressure: C₄H₁₀ Highest boili

Exam 10: Intermolecular Forces: The Uniqueness of Water

Which alkane compound has the highest boiling point?

Freezing occurs in going from region ________

Identify all of the intermolecular forces present in a pure sample of the following molecules. Br2, CH3OCH3, and NH3

Which molecule does not exhibit hydrogen bonding?

At the critical point, ________

Explain why the boiling point of nitrogen (N2, 77 K) is much lower than that of carbon monoxide (CO, 84 K), even though both have the same number of electrons and protons and nearly the same mass.

Dispersion forces are due to ________

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C6H14?

Which of the following compounds is not capable of hydrogen bonding?

Arrange the following compounds in order of increasing dispersion interactions: CCl4, CH4, C3H8.

Carbon dioxide is being used as an environmentally safe liquid solvent for reactions. If the reaction is run at a temperature of 15oC, what must the minimum pressure of the reaction vessel be? The phase diagram for carbon dioxide is shown below.

Which of the following gases would you expect to have the largest van der Waals a constant value?

Based on their boiling points, which of the following compounds has the largest dipole-dipole interaction?

Melting occurs in going from region ________

Which molecule has the largest dipole?

Which of the following nonpolar molecules will have the highest boiling point?

What does the line indicated by the arrow in the following phase diagram represent?

Which intermolecular force is caused by an instantaneous dipole generated by close contact with other atoms or molecules?

On the phase diagram below, identify the normal boiling point.

Identify which of the following alkanes has a) the highest vapor pressure and b) the highest boiling point. Briefly explain your reasoning. C4H10, C5H12, C6H14, and C7H16

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

Filters

Identify all of the intermolecular forces present in a pure sample of the following molecules. Br₂, CH₃OCH₃, and NH₃

Explain why the boiling point of nitrogen (N₂, 77 K) is much lower than that of carbon monoxide (CO, 84 K), even though both have the same number of electrons and protons and nearly the same mass.

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C₆H₁₄?

Arrange the following compounds in order of increasing dispersion interactions: CCl₄, CH₄, C₃H₈.

Carbon dioxide is being used as an environmentally safe liquid solvent for reactions. If the reaction is run at a temperature of 15^oC, what must the minimum pressure of the reaction vessel be? The phase diagram for carbon dioxide is shown below.

Identify which of the following alkanes has a) the highest vapor pressure and b) the highest boiling point. Briefly explain your reasoning. C₄H₁₀, C₅H₁₂, C₆H₁₄, and C₇H₁₆