Question 1

In general, the vapor pressure of a substance increases as __________ increases.

Accepted Answer

A) surface tension 
B) molecular weight 
C) hydrogen bonding 
D) viscosity 
E) temperature

Question 2

In the smectic A liquid-crystalline phase, __________.

Accepted Answer

A) the molecules are aligned along their long axes, with no ordering with respect to the ends of the molecules 
B) the molecules are arranged in sheets, with their long axes parallel and their ends aligned as well 
C) the molecules are aligned with their long axes tilted with respect to a line perpendicular to the plane in which the molecules are stacked 
D) disk-shaped molecules are aligned through a stacking of the disks in layers 
E) the molecules are oriented in a totally random fashion

Question 3

Which of the following characteristics would prevent liquid crystal behavior?

Accepted Answer

A) long axial structure 
B) ionic configuration 
C) carbon-carbon single bonds 
D) double bonding 
E) polar groups

Question 4

On a phase diagram, the critical pressure is __________.

Accepted Answer

A) the pressure required to melt a solid 
B) the pressure below which a substance is a solid at all temperatures 
C) the pressure above which a substance is a liquid at all temperatures 
D) the pressure at which a liquid changes to a gas 
E) the pressure required to liquefy a gas at its critical temperature

Question 5

The predominant intermolecular force in (CH3)2NH is __________.

Accepted Answer

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

Question 6

A __________ liquid crystal has the least order and is the most liquid-like.

Accepted Answer

A) nematic 
B) smectic 
C) cholesteric 
D) smectic B 
E) smectic C

Question 7

As a solid element melts, the atoms become __________ and they have __________ attraction for one another.

Accepted Answer

A) more separated, more 
B) more separated, less 
C) closer together, more 
D) closer together, less 
E) larger, greater

Question 8

In the ________ liquid crystalline phase, the component molecules are aligned along their long axis and are arranged in layers with the molecules in each plane twisted slightly in relation to the molecules in the planes above and below.

Accepted Answer

A) nematic 
B) smectic A 
C) smectic B 
D) smectic C 
E) cholesteric

Question 9

Based on the figure above, the boiling point of diethyl ether under an external pressure of 1.32 atm is __________°C.

Accepted Answer

A) 10 
B) 20 
C) 30 
D) 40 
E) 0

Question 10

The phase diagram of a substance is given above. The region that corresponds to the solid phase is __________.

Accepted Answer

A) w 
B) x 
C) y 
D) z 
E) x and y

Question 11

On a phase diagram, the critical temperature is __________.

Accepted Answer

A) the temperature below which a gas cannot be liquefied 
B) the temperature above which a gas cannot be liquefied 
C) the temperature at which all three states are in equilibrium 
D) the temperature required to melt a solid 
E) the temperature required to cause sublimation of a solid

Question 12

The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3 J/mol ∙ K. The conversion of 50.0 g of ice at 0.00°C to liquid water at 10.0°C requires __________ kJ of heat.

Accepted Answer

A) 2110 
B) 18.8 
C) 2.11 
D) 16.7 
E) Insufficient data are given.

Question 13

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

Accepted Answer

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

Question 14

Of the following, __________ is an exothermic process.

Accepted Answer

A) melting 
B) subliming 
C) freezing 
D) boiling 
E) All of the above are exothermic.

Question 15

Of the following, __________ is the least volatile.

Accepted Answer

A) CBr4 
B) CCl4 
C) CF4 
D) CH4 
E) C6H14

Question 16

The principal source of the difference in the normal boiling points of ICl (97°C; molecular mass 162 amu)and Br2 (59°C; molecular mass 160 amu)is both dipole-dipole interactions and London dispersion forces.

Accepted Answer

A) True 
 B)False

Question 17

The shape of a liquid's meniscus is determined by __________.

Accepted Answer

A) the viscosity of the liquid 
B) the type of material the container is made of 
C) the relative magnitudes of cohesive forces in the liquid and adhesive forces between the liquid and its container 
D) the amount of hydrogen bonding in the liquid 
E) the volume of the liquid

Question 18

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

Accepted Answer

A) HF 
B) H2O 
C) C6H13NH2 
D) C5H11OH 
E) None, all of the above exhibit dispersion forces.

Question 19

As a gaseous element condenses, the atoms become __________ and they have __________ attraction for one another.

Accepted Answer

A) more separated, more 
B) more separated, less 
C) closer together, more 
D) closer together, less 
E) larger, greater

Exam 11: Liquids and Intermolecular Forces

In general, the vapor pressure of a substance increases as __________ increases.

In the smectic A liquid-crystalline phase, __________.

Which of the following characteristics would prevent liquid crystal behavior?

On a phase diagram, the critical pressure is __________.

The predominant intermolecular force in (CH₃) ₂NH is __________.

A __________ liquid crystal has the least order and is the most liquid-like.

As a solid element melts, the atoms become and they have attraction for one another.

In the ________ liquid crystalline phase, the component molecules are aligned along their long axis and are arranged in layers with the molecules in each plane twisted slightly in relation to the molecules in the planes above and below.

Based on the figure above, the boiling point of diethyl ether under an external pressure of 1.32 atm is __________°C.

The phase diagram of a substance is given above. The region that corresponds to the solid phase is __________.

On a phase diagram, the critical temperature is __________.

The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3 J/mol ∙ K. The conversion of 50.0 g of ice at 0.00°C to liquid water at 10.0°C requires __________ kJ of heat.

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

Of the following, __________ is an exothermic process.

Of the following, __________ is the least volatile.

The principal source of the difference in the normal boiling points of ICl (97°C; molecular mass 162 amu)and Br₂ (59°C; molecular mass 160 amu)is both dipole-dipole interactions and London dispersion forces.

The shape of a liquid's meniscus is determined by __________.

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

As a gaseous element condenses, the atoms become and they have attraction for one another.

Exam 11: Liquids and Intermolecular Forces

In general, the vapor pressure of a substance increases as __________ increases.

In the smectic A liquid-crystalline phase, __________.

Which of the following characteristics would prevent liquid crystal behavior?

On a phase diagram, the critical pressure is __________.

The predominant intermolecular force in (CH3) 2NH is __________.

A __________ liquid crystal has the least order and is the most liquid-like.

As a solid element melts, the atoms become __________ and they have __________ attraction for one another.

In the ________ liquid crystalline phase, the component molecules are aligned along their long axis and are arranged in layers with the molecules in each plane twisted slightly in relation to the molecules in the planes above and below.

Based on the figure above, the boiling point of diethyl ether under an external pressure of 1.32 atm is __________°C.

The phase diagram of a substance is given above. The region that corresponds to the solid phase is __________.

On a phase diagram, the critical temperature is __________.

The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3 J/mol ∙ K. The conversion of 50.0 g of ice at 0.00°C to liquid water at 10.0°C requires __________ kJ of heat.

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

Of the following, __________ is an exothermic process.

Of the following, __________ is the least volatile.

The principal source of the difference in the normal boiling points of ICl (97°C; molecular mass 162 amu)and Br2 (59°C; molecular mass 160 amu)is both dipole-dipole interactions and London dispersion forces.

The shape of a liquid's meniscus is determined by __________.

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

As a gaseous element condenses, the atoms become __________ and they have __________ attraction for one another.

The predominant intermolecular force in (CH₃) ₂NH is __________.

As a solid element melts, the atoms become and they have attraction for one another.

The principal source of the difference in the normal boiling points of ICl (97°C; molecular mass 162 amu)and Br₂ (59°C; molecular mass 160 amu)is both dipole-dipole interactions and London dispersion forces.

As a gaseous element condenses, the atoms become and they have attraction for one another.