Question 1

What is the dominant intermolecular force for propionic acid?

Accepted Answer

A)  hydrogen bonding 
B)  dipole interactions 
C)  dispersion 
D)  ionic 
E)  none of these 
A)  hydrogen bonding 
B)  dipole interactions 
C)  dispersion 
D)  ionic 
E)  none of these

Question 2

In which of the following pure substances will hydrogen bonding be an important intermolecular force? 1) dichloromethane, CH2Cl2, 2) CH3CH2OH, 3) methylamine, (CH3NH2), 4) trimethylamine, N(CH3)3

Accepted Answer

A)  2 and 3 
B)  all 
C)  none 
D)  1 and 2 
E)  3 and 4 
A)  2 and 3 
B)  all 
C)  none 
D)  1 and 2 
E)  3 and 4

Question 3

Polonium metal crystallizes in a simple cubic structure. If the atomic radius of polonium is 160 pm, what is the volume of a unit cell?

Accepted Answer

A)  3.28x10-23 cm3 
B)  4.10 x 10-29 m3 
C)  4.10 x106 pm3 
D)  3.28 x 10-6 m3 
E)  3.28 x 10-23 m3 
A)  3.28x10-23 cm3 
B)  4.10 x 10-29 m3 
C)  4.10 x106 pm3 
D)  3.28 x 10-6 m3 
E)  3.28 x 10-23 m3

Question 4

Which of the following experience the strongest covalent bond?

Accepted Answer

A)  F2 
B)  I2 
C)  Br2 
D)  Cl2 
A)  F2 
B)  I2 
C)  Br2 
D)  Cl2

Question 5

Use the following equation for questions 
  
-The value "nb" that is used in the Van der Waals equation accounts for what INCORRECT assumption?

Accepted Answer

A)  that gaseous collisions are not completely elastic 
B)  that gas molecules do take up space 
C)  that gas molecules interact with each other 
D)  that gas molecules do not travel in straight lines 
E)  that the velocity of gas molecules changes with temperature 
A)  that gaseous collisions are not completely elastic 
B)  that gas molecules do take up space 
C)  that gas molecules interact with each other 
D)  that gas molecules do not travel in straight lines 
E)  that the velocity of gas molecules changes with temperature

Question 6

Explain enthalpies of phase changes in terms of intermolecular forces and interpret a pressure-temperature phase diagram of a pure substance.

Accepted Answer

A phase diagram shows which phases are t

Question 7

Predict the relative magnitudes of intermolecular forces and their effects on physical properties of substances.

Accepted Answer

All intermolecular forces are electrosta

Question 8

Explain the properties of solids in terms of the dominant intermolecular forces present.

Accepted Answer

Forces in solids may

Question 9

Some believe that differences between boiling points are truer indicators of relative intermolecular forces than melting points. Why?

Accepted Answer

Because in vapourization, all

Question 10

How much energy is required when 23 grams of ethanol at 30˚C are vapourized from a "flaming" desert? ΔH˚vap = 39.3 kJ/mol, Tvap = 351 K, ΔH˚fus = 7.61 kJ/mol, Tfus = 156 K, Cethanol = 112 J/mol˚C

Accepted Answer

Question 11

30 In the simple cubic crystal structure at right, the unit cell is outlined in heavy lines which intersect to form the corners at the center of the spheres. If the corners of the unit cells are at the center of the spheres, how many atoms are in one unit cell?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6 
A)  1 
B)  2 
C)  3 
D)  4 
E)  6

Question 12

Which of the following experience the strongest intermolecular forces?

Accepted Answer

A)  F2 
B)  I2 
C)  Br2 
D)  Cl2 
A)  F2 
B)  I2 
C)  Br2 
D)  Cl2

Question 13

Define supercritical fluid and how to make such a fluid.

Accepted Answer

A supercritical fluid is one t

Question 14

Use the phase diagram of oxygen to estimate the temperature at which liquid oxygen will boil under 0.5 atm external pressure and compare that to the normal boiling point.

Accepted Answer

The answer of Use the phase diagram of oxygen to...

Question 15

Which is the most realistic picture for a container of Ar(l)?

Accepted Answer

A)       
  
B)   
  
C)   
  
D)  
  
E)   
  
A)       
  
B)   
  
C)   
  
D)  
  
E)

Question 16

The boiling point of HCl (188 K) is lower than that for HI (238 K) because

Accepted Answer

A)  HI is more polar therefore the intermolecular dipole-dipole forces are stronger in HI. 
B)  HCl is more polar therefore the intermolecular dipole-dipole forces are stronger in HI. 
C)  the molecular mass of HI is greater than that of HCl. 
D)  HI is more polarizable, dispersion forces compensate for the lower dipole forces in HI. 
E)  HI is capable of hydrogen bonding, HCl is not. 
A)  HI is more polar therefore the intermolecular dipole-dipole forces are stronger in HI. 
B)  HCl is more polar therefore the intermolecular dipole-dipole forces are stronger in HI. 
C)  the molecular mass of HI is greater than that of HCl. 
D)  HI is more polarizable, dispersion forces compensate for the lower dipole forces in HI. 
E)  HI is capable of hydrogen bonding, HCl is not.

Question 17

Where would you expect Ne to appear in the following sequence of boiling points?
He 2 2 2 2

Accepted Answer

A)  lower than He 
B)  between He and H2 
C)  between H2 and N2 
D)  between F2 and Ar 
E)  between Ar and O2 
A)  lower than He 
B)  between He and H2 
C)  between H2 and N2 
D)  between F2 and Ar 
E)  between Ar and O2

Question 18

List the following three compounds in order of increasing boiling point:

Accepted Answer

A)  1, 2, 3 
B)  3, 2, 1 
C)  1, 3, 2 
D)  2, 1, 3 
E)  2, 3, 1 
A)  1, 2, 3 
B)  3, 2, 1 
C)  1, 3, 2 
D)  2, 1, 3 
E)  2, 3, 1

Question 19

Consider the following three molecules:   The dominant intermolecular force acting in each is, respectively ,

Accepted Answer

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

Question 20

Of the following pairs, select the pair that undergoes hydrogen bonding and draw a molecular picture of the hydrogen bond interaction.
1. NaCl and acetone, (CH3)2CO
2. CH3OCH3 and CF3Cl
3. NH3 and CCl4
4. NF3 and CF4
5. CH3NH2 and CH3OCH3

Accepted Answer

#5 undergo

Exam 8: Effects of Intermolecular Forces

What is the dominant intermolecular force for propionic acid?

In which of the following pure substances will hydrogen bonding be an important intermolecular force? 1) dichloromethane, CH2Cl2, 2) CH3CH2OH, 3) methylamine, (CH3NH2), 4) trimethylamine, N(CH3)3

Polonium metal crystallizes in a simple cubic structure. If the atomic radius of polonium is 160 pm, what is the volume of a unit cell?

Which of the following experience the strongest covalent bond?

Use the following equation for questions -The value "nb" that is used in the Van der Waals equation accounts for what INCORRECT assumption?

Explain enthalpies of phase changes in terms of intermolecular forces and interpret a pressure-temperature phase diagram of a pure substance.

Predict the relative magnitudes of intermolecular forces and their effects on physical properties of substances.

Explain the properties of solids in terms of the dominant intermolecular forces present.

Some believe that differences between boiling points are truer indicators of relative intermolecular forces than melting points. Why?

How much energy is required when 23 grams of ethanol at 30˚C are vapourized from a "flaming" desert? ΔH˚vap = 39.3 kJ/mol, Tvap = 351 K, ΔH˚fus = 7.61 kJ/mol, Tfus = 156 K, Cethanol = 112 J/mol˚C

30 In the simple cubic crystal structure at right, the unit cell is outlined in heavy lines which intersect to form the corners at the center of the spheres. If the corners of the unit cells are at the center of the spheres, how many atoms are in one unit cell?

Which of the following experience the strongest intermolecular forces?

Define supercritical fluid and how to make such a fluid.

Use the phase diagram of oxygen to estimate the temperature at which liquid oxygen will boil under 0.5 atm external pressure and compare that to the normal boiling point.

Which is the most realistic picture for a container of Ar(l)?

The boiling point of HCl (188 K) is lower than that for HI (238 K) because

Where would you expect Ne to appear in the following sequence of boiling points? He < H2 < N2 < F2 < Ar < O2

List the following three compounds in order of increasing boiling point:

Consider the following three molecules: The dominant intermolecular force acting in each is, respectively ,

Of the following pairs, select the pair that undergoes hydrogen bonding and draw a molecular picture of the hydrogen bond interaction. 1. NaCl and acetone, (CH3)2CO 2. CH3OCH3 and CF3Cl 3. NH3 and CCl4 4. NF3 and CF4 5. CH3NH2 and CH3OCH3

Fundamental Concepts of Chemistry

The Behaviour of Gases

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Applications of Aqueous Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

Filters

In which of the following pure substances will hydrogen bonding be an important intermolecular force? 1) dichloromethane, CH₂Cl₂_, 2) CH₃CH₂OH, 3) methylamine, (CH₃NH₂), 4) trimethylamine, N(CH₃)₃

How much energy is required when 23 grams of ethanol at 30˚C are vapourized from a "flaming" desert? ΔH˚_vap = 39.3 kJ/mol, T_vap = 351 K, ΔH˚_fus = 7.61 kJ/mol, T_fus = 156 K, C_ethanol = 112 J/mol˚C

Where would you expect Ne to appear in the following sequence of boiling points? He < H₂< N₂< F₂< Ar < O₂

Of the following pairs, select the pair that undergoes hydrogen bonding and draw a molecular picture of the hydrogen bond interaction. 1. NaCl and acetone, (CH₃)₂CO 2. CH₃OCH₃ and CF₃Cl 3. NH₃ and CCl₄ 4. NF₃ and CF₄ 5. CH₃NH₂ and CH₃OCH₃