Question 1

The temperature at point b in the phase diagram below is the ________

Accepted Answer

A) critical point. 
B) triple point. 
C) transition point. 
D) normal freezing point. 
E) normal boiling point. 
A) critical point. 
B) triple point. 
C) transition point. 
D) normal freezing point. 
E) normal boiling point.

Question 2

Which of the following substances is a solid at 25F1F1F1S1F1F1F10C and 1 atm?

Accepted Answer

A)    
B)    
C)    
D) None of these substances are solid under these conditions. 
A)    
B)    
C)    
D) None of these substances are solid under these conditions.

Question 3

Which is the dominant interaction between carbon tetrafluoride molecules, CF4?

Accepted Answer

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

Question 4

The smell of fresh-cut pine is due in part to a cyclic alkene called pinene. A graph of the natural logarithm of the vapor pressure of pinene vs. 1/temperature produces a straight line with a slope of   F1F1F1S1F1F1F104,936.37 K. What is the enthalpy of vaporization of pinene?

Accepted Answer

A) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F10397 kJ/mol) 
B) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1039.7 kJ/mol) 
C) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1039.7 kJ/mol) 
D) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1041.0 kJ/mol) 
E) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1041.0 kJ/mol) 
A) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F10397 kJ/mol) 
B) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1039.7 kJ/mol) 
C) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1039.7 kJ/mol) 
D) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1041.0 kJ/mol) 
E) (F1F1F1S1F1F1F10   F1F1F1S1F1F1F1041.0 kJ/mol)

Question 5

Describe the similarity and the difference between sublimation and evaporation.

Accepted Answer

In both sublimation and evapor

Question 6

Identify all of the intermolecular forces present in each of the following molecules.
(CH3)2CO, H2O, and N2

Accepted Answer

(CH₃)₂CO: dipole-dipole and disp

Question 7

Which of the following compounds would be most soluble in carbon tetrachloride, CCl4?

Accepted Answer

A) H2O 
B) CH3OH 
C) NH3 
D) C6H6 
E) HCl 
A) H2O 
B) CH3OH 
C) NH3 
D) C6H6 
E) HCl

Question 8

Sketch a phase diagram for water and correctly label all the parts (areas, lines, points, key temperatures).

Accepted Answer

Boiling points can also be cal

Question 9

For molecules, atoms, or ions with the same mass, which of the following forces typically is the strongest intermolecular interaction?

Accepted Answer

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

Question 10

The relative energies (strengths) of the intermolecular forces between four different substances are shown in the figure below. Which substance has the highest boiling point?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
A) a 
B) b 
C) c 
D) d

Question 11

Which of the following compounds will have the strongest dipole-dipole interactions between its molecules?

Accepted Answer

A) CF4 
B) CH4 
C) CH3F 
D) CH2F2 
E) CH3Cl 
A) CF4 
B) CH4 
C) CH3F 
D) CH2F2 
E) CH3Cl

Question 12

If the same liquid is present in each of the containers shown below, choose the solution with the highest rate of evaporation. Assume each container is full and has equal volume and only the top of the container is open.

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) All have equal evaporation rates. 
A) I 
B) II 
C) III 
D) IV 
E) All have equal evaporation rates.

Question 13

Which of the following molecules has the highest boiling point?

Accepted Answer

A) CH4 
B) SiH4 
C) SnH4 
D) GeH4 
E) H2 
A) CH4 
B) SiH4 
C) SnH4 
D) GeH4 
E) H2

Question 14

Consider the phase diagram for a substance shown here. The line between the solid and liquid phases has a positive slope because the solid phase is ________ than the liquid phase.

Accepted Answer

A) more dense 
B) less dense 
C) more massive 
D) less massive 
E) hotter 
A) more dense 
B) less dense 
C) more massive 
D) less massive 
E) hotter

Question 15

The relative energies (strengths) of the intermolecular forces between four different substances are shown in the figure below. Which substance has the lowest boiling point?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
A) a 
B) b 
C) c 
D) d

Question 16

Which of the following polar compounds is likely to have the highest boiling point?

Accepted Answer

A) CH3OCH3 
B) CH3CH2OH 
C) (CH3)2CO 
D) H2CO 
E) CO 
A) CH3OCH3 
B) CH3CH2OH 
C) (CH3)2CO 
D) H2CO 
E) CO

Question 17

Why does HI boil at a higher temperature than HBr, yet the dipole moment of HBr (0.82 D) is larger than that of HI (0.38 D)?

Accepted Answer

The dispersion interactions ar

Question 18

Which of the following compounds is capable of hydrogen bonding?

Accepted Answer

A) (CH3)3N 
B) CH3CH2NHCH3 
C) CH3CH2CH3 
D) CH3COCH3 
E) H2CO 
A) (CH3)3N 
B) CH3CH2NHCH3 
C) CH3CH2CH3 
D) CH3COCH3 
E) H2CO

Question 19

CH2F2 has a dipole moment of 1.93 D and a boiling point of F1F1F1S1F1F1F1052F1F1F1S1F1F1F10C. CH2Cl2 has a dipole moment of 1.60 D and a boiling point of 40F1F1F1S1F1F1F10C. The boiling point of dichloromethane is higher than that of difluoromethane because of ________

Accepted Answer

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

Question 20

Arrange the first four halogens in order of increasing boiling point.

Accepted Answer

fluorine F1F1F1S1F1

Exam 10: Intermolecular Forces: The Uniqueness of Water

The temperature at point b in the phase diagram below is the ________

Which of the following substances is a solid at 25C and 1 atm?

Which is the dominant interaction between carbon tetrafluoride molecules, CF4?

The smell of fresh-cut pine is due in part to a cyclic alkene called pinene. A graph of the natural logarithm of the vapor pressure of pinene vs. 1/temperature produces a straight line with a slope of 4,936.37 K. What is the enthalpy of vaporization of pinene?

Describe the similarity and the difference between sublimation and evaporation.

Identify all of the intermolecular forces present in each of the following molecules. (CH3)2CO, H2O, and N2

Which of the following compounds would be most soluble in carbon tetrachloride, CCl4?

Sketch a phase diagram for water and correctly label all the parts (areas, lines, points, key temperatures).

For molecules, atoms, or ions with the same mass, which of the following forces typically is the strongest intermolecular interaction?

The relative energies (strengths) of the intermolecular forces between four different substances are shown in the figure below. Which substance has the highest boiling point?

Which of the following compounds will have the strongest dipole-dipole interactions between its molecules?

If the same liquid is present in each of the containers shown below, choose the solution with the highest rate of evaporation. Assume each container is full and has equal volume and only the top of the container is open.

Which of the following molecules has the highest boiling point?

Consider the phase diagram for a substance shown here. The line between the solid and liquid phases has a positive slope because the solid phase is ________ than the liquid phase.

The relative energies (strengths) of the intermolecular forces between four different substances are shown in the figure below. Which substance has the lowest boiling point?

Which of the following polar compounds is likely to have the highest boiling point?

Why does HI boil at a higher temperature than HBr, yet the dipole moment of HBr (0.82 D) is larger than that of HI (0.38 D)?

Which of the following compounds is capable of hydrogen bonding?

CH2F2 has a dipole moment of 1.93 D and a boiling point of 52C. CH2Cl2 has a dipole moment of 1.60 D and a boiling point of 40C. The boiling point of dichloromethane is higher than that of difluoromethane because of ________

Arrange the first four halogens in order of increasing boiling point.

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

Which is the dominant interaction between carbon tetrafluoride molecules, CF₄?

Identify all of the intermolecular forces present in each of the following molecules. (CH₃)₂CO, H₂O, and N₂

Which of the following compounds would be most soluble in carbon tetrachloride, CCl₄?

CH₂F₂ has a dipole moment of 1.93 D and a boiling point of 52C. CH₂Cl₂ has a dipole moment of 1.60 D and a boiling point of 40C. The boiling point of dichloromethane is higher than that of difluoromethane because of ________