Question 1

Which one of the following derivatives of ethane has the highest boiling point?

Accepted Answer

A) C2Br6 
B) C2F6 
C) C2I6 
D) C2Cl6 
E) C2H6 
A) C2Br6 
B) C2F6 
C) C2I6 
D) C2Cl6 
E) C2H6

Question 2

Of the following substances, only __________ has London dispersion forces as its only intermolecular force.

Accepted Answer

A) CH3OH 
B) NH3 
C) H2S 
D) CH4 
E) HCl 
A) CH3OH 
B) NH3 
C) H2S 
D) CH4 
E) HCl

Question 3

Heats of vaporization are greater than heats of fusion.

Accepted Answer

A) True 
 B)False

Question 4

Which one of the following exhibits dipole-dipole attraction between molecules?

Accepted Answer

A) PH3 
B) CCl4 
C) Br2 
D) CO2 
E) C10H22 
A) PH3 
B) CCl4 
C) Br2 
D) CO2 
E) C10H22

Question 5

Based on the following information, which compound has the strongest intermolecular forces? Substance ΔHvap(kJ/mol)
Argon (Ar)6.3
Benzene (C6H6)31.0
Ethanol (C2H5OH)39.3
Water (H2O)40.8
Methane (CH4)9.2

Accepted Answer

A) Argon 
B) Benzene 
C) Ethanol 
D) Water 
E) Methane 
A) Argon 
B) Benzene 
C) Ethanol 
D) Water 
E) Methane

Question 6

The critical temperature and pressure of CS2 are 279°C and 78 atm, respectively. At temperatures above 279°C and pressures above 78 atm, CS2 can only occur as a __________.

Accepted Answer

A) solid 
B) liquid 
C) liquid and gas 
D) gas 
E) supercritical fluid 
A) solid 
B) liquid 
C) liquid and gas 
D) gas 
E) supercritical fluid

Question 7

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

Accepted Answer

A) CH4 
B) C5H11OH 
C) C6H13NH2 
D) CH3OH 
E) CO2 
A) CH4 
B) C5H11OH 
C) C6H13NH2 
D) CH3OH 
E) CO2

Question 8

The direct conversion of a solid to a gas is called __________.

Accepted Answer

The answer of The direct conversion of a solid to...

Question 9

Which of the following is most likely to exhibit liquid-crystalline behavior?

Accepted Answer

A) CH3CH2-C(CH3)2-CH2CH3 
B) CH3CH2CH2CH2CH2CH2CH2CH3 
C) CH3CH2CH2CH2CH2-Na+ 
D)    
E)    
A) CH3CH2-C(CH3)2-CH2CH3 
B) CH3CH2CH2CH2CH2CH2CH2CH3 
C) CH3CH2CH2CH2CH2-Na+ 
D)    
E)

Question 10

Which statement is true about liquids but not true about solids?

Accepted Answer

A) They flow and are highly ordered. 
B) They are highly ordered and not compressible. 
C) They flow and are compressible. 
D) They assume both the volume and the shape of their containers. 
E) They flow and are not compressible. 
A) They flow and are highly ordered. 
B) They are highly ordered and not compressible. 
C) They flow and are compressible. 
D) They assume both the volume and the shape of their containers. 
E) They flow and are not compressible.

Question 11

Of the following substances, only __________ has London dispersion forces as its only intermolecular force.

Accepted Answer

A) H2O 
B) CCl4 
C) HF 
D) CH3COOH 
E) PH3 
A) H2O 
B) CCl4 
C) HF 
D) CH3COOH 
E) PH3

Question 12

On a phase diagram, the melting point is the same as __________.

Accepted Answer

A) the triple point 
B) the critical point 
C) the freezing point 
D) the boiling point 
E) the vapor-pressure curve 
A) the triple point 
B) the critical point 
C) the freezing point 
D) the boiling point 
E) the vapor-pressure curve

Question 13

Of the following, __________ has the highest boiling point.

Accepted Answer

A) N2 
B) Br2 
C) H2 
D) Cl2 
E) O2 
A) N2 
B) Br2 
C) H2 
D) Cl2 
E) O2

Question 14

Crystalline solids __________.

Accepted Answer

A) have their particles arranged randomly 
B) have highly ordered structures 
C) are usually very soft 
D) exist only at high temperatures 
E) exist only at very low temperatures 
A) have their particles arranged randomly 
B) have highly ordered structures 
C) are usually very soft 
D) exist only at high temperatures 
E) exist only at very low temperatures

Question 15

Which of the following molecules has hydrogen bonding as its only intermolecular force?

Accepted Answer

A) NH3 
B) H2O 
C) C3H7OH 
D) HOCH2CH2OH 
E) None, all of the above exhibit dispersion forces. 
A) NH3 
B) H2O 
C) C3H7OH 
D) HOCH2CH2OH 
E) None, all of the above exhibit dispersion forces.

Question 16

The normal melting point of the substance with the phase diagram shown above is __________°C.

Accepted Answer

A) 15 
B) 25 
C) 35 
D) 45 
E) 55 
A) 15 
B) 25 
C) 35 
D) 45 
E) 55

Question 17

London Dispersion Forces tend to __________ in strength with increasing molecular weight.

Accepted Answer

The answer of London Dispersion Forces tend to __________ in...

Question 18

For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs __________.

Accepted Answer

A) over a range of temperatures between the melting point of the solid and the boiling point of the liquid 
B) at the melting point of the solid 
C) over a range of temperatures that includes the melting point of the solid 
D) at a well defined temperature above the melting point of the solid 
E) at a well defined temperature below the melting point of the solid 
A) over a range of temperatures between the melting point of the solid and the boiling point of the liquid 
B) at the melting point of the solid 
C) over a range of temperatures that includes the melting point of the solid 
D) at a well defined temperature above the melting point of the solid 
E) at a well defined temperature below the melting point of the solid

Question 19

Elemental iodine (I2)is a solid at room temperature. What is the major attractive force that exists among different I2 molecules in the solid?

Accepted Answer

A) London dispersion forces 
B) dipole-dipole rejections 
C) ionic-dipole interactions 
D) covalent-ionic interactions 
E) dipole-dipole attractions 
A) London dispersion forces 
B) dipole-dipole rejections 
C) ionic-dipole interactions 
D) covalent-ionic interactions 
E) dipole-dipole attractions

Question 20

The boiling points of normal hydrocarbons are higher than those of branched hydrocarbons of similar molecular weight because the London-dispersion forces between normal hydrocarbons are greater than those between branched hydrocarbons.

Accepted Answer

A) True 
 B)False

Exam 11: Liquids and Intermolecular Forces

Which one of the following derivatives of ethane has the highest boiling point?

Of the following substances, only __________ has London dispersion forces as its only intermolecular force.

Heats of vaporization are greater than heats of fusion.

Which one of the following exhibits dipole-dipole attraction between molecules?

Based on the following information, which compound has the strongest intermolecular forces? Substance ΔHvap(kJ/mol) Argon (Ar)6.3 Benzene (C6H6)31.0 Ethanol (C2H5OH)39.3 Water (H2O)40.8 Methane (CH4)9.2

The critical temperature and pressure of CS2 are 279°C and 78 atm, respectively. At temperatures above 279°C and pressures above 78 atm, CS2 can only occur as a __________.

In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces?

The direct conversion of a solid to a gas is called __________.

Which of the following is most likely to exhibit liquid-crystalline behavior?

Which statement is true about liquids but not true about solids?

Of the following substances, only __________ has London dispersion forces as its only intermolecular force.

On a phase diagram, the melting point is the same as __________.

Of the following, __________ has the highest boiling point.

Crystalline solids __________.

Which of the following molecules has hydrogen bonding as its only intermolecular force?

The normal melting point of the substance with the phase diagram shown above is __________°C.

London Dispersion Forces tend to __________ in strength with increasing molecular weight.

For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs __________.

Elemental iodine (I2)is a solid at room temperature. What is the major attractive force that exists among different I2 molecules in the solid?

The boiling points of normal hydrocarbons are higher than those of branched hydrocarbons of similar molecular weight because the London-dispersion forces between normal hydrocarbons are greater than those between branched hydrocarbons.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Based on the following information, which compound has the strongest intermolecular forces? Substance ΔH_vap(kJ/mol) Argon (Ar)6.3 Benzene (C₆H₆)31.0 Ethanol (C₂H₅OH)39.3 Water (H₂O)40.8 Methane (CH₄)9.2

The critical temperature and pressure of CS₂ are 279°C and 78 atm, respectively. At temperatures above 279°C and pressures above 78 atm, CS₂ can only occur as a __________.

Elemental iodine (I₂)is a solid at room temperature. What is the major attractive force that exists among different I₂ molecules in the solid?