Question 1

Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.

Accepted Answer

A)   H2SO4 (dihydrogen sulfate) 
B)   CH3OH (methanol) 
C)   CH3OCH3 (dimethyl ether) 
D)   HF (hydrogen fluoride) 
E)   CH3CO2H (acetic acid)

Question 2

As pure molecular solids,which of the following exhibits dipole-dipole intermolecular forces: HBr,NBr3,SBr2,and CBr4?

Accepted Answer

A)   HBr only
B)   CBr4 only
C)   HBr and SBr2
D)   NBr3 and CBr4
E)   HBr,NBr3,and SBr2

Question 3

Ethanol has an enthalpy of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3  ∘\circ∘ C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.314 J/K.mol)

Accepted Answer

A)   -83.8  ∘\circ∘ C
B)   -24.4  ∘\circ∘ C
C)   62.6  ∘\circ∘ C
D)   73.0  ∘\circ∘ C
E)   78.0  ∘\circ∘ C

Question 4

A particular compound has an enthalpy of vaporization of 28300 J/mol.At 281 K it has a vapor pressure of 101 mmHg.What is its vapor pressure at 301 K? (R = 8.31 J/K·mol; 1 atm = 760 mmHg)

Accepted Answer

A)   98.8 mmHg
B)   123 mmHg
C)   45.2 mmHg
D)   226 mmHg
E)   103 mmHg

Question 5

Capillary action is ____

Accepted Answer

A)   resistance to flow.
B)   the rate of collisions for gas molecules.
C)   the energy required to overcome the attractive forces between molecules in the liquid state to form a gas.
D)   the force required to expand the surface of a liquid.
E)   the drawing of a liquid up the inside of a small-bore tube when adhesive forces exceed cohesive forces.

Question 6

Which of the following has the   greatest ‾\underline{	ext{  greatest }} greatest ​ boiling point?

Accepted Answer

A)   Ne
B)   N2
C)   Cl2
D)   I2
E)   F2

Question 7

Which of the following are valid reasons why vegetable oil has a greater viscosity than diethyl ether,CH3OCH3?
1) Oil molecules have long chains that become entangled.
2) Unlike diethyl ether,oil molecules are not held together by hydrogen bonds.
3) Intermolecular forces are greater for the larger oil molecules.

Accepted Answer

A)   1 only
B)   2 only
C)   3 only
D)   1 and 3
E)   2 and 3

Question 8

Which of the following nonpolar molecules has the highest boiling point?

Accepted Answer

A)   N2
B)   C2H4
C)   F2
D)   O2
E)   CS2

Question 9

Which of the following statements best describes what happens when a small amount of solid rubidium bromide is dissolved in water?

Accepted Answer

A)   The heat from the warm water melts the solid,making it a liquid.
B)   Nothing happens,because rubidium bromide is insoluble in water.
C)   The solid RbBr breaks apart into separate Rb and Br atoms by interacting with the water molecules.
D)   The water molecules surround each ion in the solid RbBr,separating the Rb ions from the Br ions.
E)   The solid undergoes a chemical change by reacting with the water.

Question 10

Which of the following substances will have the strongest intermolecular forces?

Accepted Answer

A)   H2S
B)   CO
C)   CH3OH
D)   HBr
E)   Ar

Question 11

Xenon has an enthalpy of vaporization of 12.6 kJ/mol and a vapor pressure of 1.00 atm at -108.0  ∘\circ∘ C.What is the vapor pressure of xenon at -148.0  ∘\circ∘ C? (R = 8.314 J/K.mol)

Accepted Answer

A)   0.053 atm
B)   0.73 atm
C)   0.93 atm
D)   0.99 atm
E)   19 atm

Question 12

Which of the following strong electrolytes has the least negative hydration enthalpy?

Accepted Answer

A)   NaCl
B)   KCl
C)   RbCl
D)   CsCl
E)   HCl

Question 13

At its boiling point of 58.8  ∘\circ∘ C,4.39 kJ of heat is required to vaporize 23.4 g of bromine (Br2) .What is the molar enthalpy of vaporization of bromine?

Accepted Answer

A)   0.643 kJ/mol
B)   0.188 kJ/mol
C)   30.0 kJ/mol
D)   5.33 kJ/mol
E)   36.39 kJ/mol

Question 14

The elements of group 5A,the nitrogen family,form compounds with hydrogen having the boiling points listed below:

SbH3 -17°C,AsH3 -55°C,PH3 -87°C,NH3 -33°C.

The first three compounds illustrate a trend where the boiling point decreases as the mass decreases; however,ammonia (NH3) does not follow the trend because of ___.

Accepted Answer

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

Question 15

Which of the following statements concerning a supercritical fluid (SCF) is/are CORRECT?
1) An SCF has a density similar to that of a gas.
2) An SCF has a viscosity similar to that of a liquid.
3) An SCF fills its entire container,much like a gas.

Accepted Answer

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

Question 16

The best explanation for the existence of a meniscus observed when water is placed in a glass tube of small diameter is

Accepted Answer

A)   the surface tension of the water causes it to "bead up" inside the container.
B)   the attractive forces between the water molecules and the walls of the container are greater than the attractive forces between the water molecules.
C)   the molecules are forced closer together because of London forces.
D)   the viscosity of the water is greater than the viscosity of the glass.
E)   the hydrogen bonds between water molecules are greater than the attractions between the water molecules and the walls of the container.

Question 17

Above its critical temperature and pressure,a substance becomes a(n)________ fluid.

Accepted Answer

The answer of Above its critical temperature and pressure,a substance...

Question 18

Which of the following phase transitions is/are endothermic?
1) liquid water freezing to a solid at its normal freezing point of 0.0  ∘\circ∘ C.
2) the sublimation of solid carbon dioxide into the gas phase.
3) gaseous sulfur dioxide condensing into a liquid at its boiling point of -10.0  ∘\circ∘ C.

Accepted Answer

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

Question 19

Arrange H2S,H2Se,and H2Te in order from lowest to highest boiling point.

Accepted Answer

A)   H2Te 2Se 2S
B)   H2S 2Se 2Te
C)   H2S 2Te 2Se
D)   H2Se 2Te 2S
E)   H2Te 2S 2Se

Question 20

Which one of the following molecules will exhibit dipole-dipole intermolecular forces as a pure liquid or solid?

Accepted Answer

A)   CS2
B)   C2H2
C)   CCl4
D)   F2
E)   PCl3

Exam 12: Intermolecular Forces and Liquids

Ethanol has an enthalpy of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3 ^$\circ$C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.314 J/K.mol)

Correct Answer
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As pure molecular solids,which of the following exhibits dipole-dipole intermolecular forces: HBr,NBr₃,SBr₂,and CBr₄?

Correct Answer
verified

The best explanation for the existence of a meniscus observed when water is placed in a glass tube of small diameter is

Correct Answer
verified

Which of the following statements concerning a supercritical fluid (SCF) is/are CORRECT? 1) An SCF has a density similar to that of a gas. 2) An SCF has a viscosity similar to that of a liquid. 3) An SCF fills its entire container,much like a gas.

Correct Answer
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Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.

Correct Answer
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A particular compound has an enthalpy of vaporization of 28300 J/mol.At 281 K it has a vapor pressure of 101 mmHg.What is its vapor pressure at 301 K? (R = 8.31 J/K·mol; 1 atm = 760 mmHg)

Correct Answer
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Which of the following nonpolar molecules has the highest boiling point?

Correct Answer
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Which of the following statements best describes what happens when a small amount of solid rubidium bromide is dissolved in water?

Correct Answer
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Which of the following has the $\underline{\text{ greatest }}$ boiling point?

Correct Answer
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Which of the following phase transitions is/are endothermic? 1) liquid water freezing to a solid at its normal freezing point of 0.0 ^$\circ$C. 2) the sublimation of solid carbon dioxide into the gas phase. 3) gaseous sulfur dioxide condensing into a liquid at its boiling point of -10.0 ^$\circ$C.

Correct Answer
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Correct Answer
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Which one of the following molecules will exhibit dipole-dipole intermolecular forces as a pure liquid or solid?

Correct Answer
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Above its critical temperature and pressure,a substance becomes a(n)________ fluid.

Correct Answer
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Capillary action is ____

Correct Answer
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Arrange H₂S,H₂Se,and H₂Te in order from lowest to highest boiling point.

Correct Answer
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Correct Answer
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Which of the following strong electrolytes has the least negative hydration enthalpy?

Correct Answer
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Which of the following substances will have the strongest intermolecular forces?

Correct Answer
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At its boiling point of 58.8 ^$\circ$C,4.39 kJ of heat is required to vaporize 23.4 g of bromine (Br₂) .What is the molar enthalpy of vaporization of bromine?

Correct Answer
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Xenon has an enthalpy of vaporization of 12.6 kJ/mol and a vapor pressure of 1.00 atm at -108.0 ^$\circ$C.What is the vapor pressure of xenon at -148.0 ^$\circ$C? (R = 8.314 J/K.mol)

Correct Answer
verified

Exam 12: Intermolecular Forces and Liquids

Ethanol has an enthalpy of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3 ∘\circ∘ C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.314 J/K.mol)

Correct AnswerverifiedShow Answer

As pure molecular solids,which of the following exhibits dipole-dipole intermolecular forces: HBr,NBr3,SBr2,and CBr4?

Correct AnswerverifiedShow Answer

The best explanation for the existence of a meniscus observed when water is placed in a glass tube of small diameter is

Correct AnswerverifiedShow Answer

Which of the following statements concerning a supercritical fluid (SCF) is/are CORRECT? 1) An SCF has a density similar to that of a gas. 2) An SCF has a viscosity similar to that of a liquid. 3) An SCF fills its entire container,much like a gas.

Correct AnswerverifiedShow Answer

Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.

Correct AnswerverifiedShow Answer

A particular compound has an enthalpy of vaporization of 28300 J/mol.At 281 K it has a vapor pressure of 101 mmHg.What is its vapor pressure at 301 K? (R = 8.31 J/K·mol; 1 atm = 760 mmHg)

Correct AnswerverifiedShow Answer

Which of the following nonpolar molecules has the highest boiling point?

Correct AnswerverifiedShow Answer

Which of the following statements best describes what happens when a small amount of solid rubidium bromide is dissolved in water?

Correct AnswerverifiedShow Answer

Which of the following has the greatest ‾\underline{\text{ greatest }} greatest ​ boiling point?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which one of the following molecules will exhibit dipole-dipole intermolecular forces as a pure liquid or solid?

Correct AnswerverifiedShow Answer

Above its critical temperature and pressure,a substance becomes a(n)________ fluid.

Correct AnswerverifiedShow Answer

Capillary action is ____

Correct AnswerverifiedShow Answer

Arrange H2S,H2Se,and H2Te in order from lowest to highest boiling point.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following strong electrolytes has the least negative hydration enthalpy?

Correct AnswerverifiedShow Answer

Which of the following substances will have the strongest intermolecular forces?

Correct AnswerverifiedShow Answer

At its boiling point of 58.8 ∘\circ∘ C,4.39 kJ of heat is required to vaporize 23.4 g of bromine (Br2) .What is the molar enthalpy of vaporization of bromine?

Correct AnswerverifiedShow Answer

Xenon has an enthalpy of vaporization of 12.6 kJ/mol and a vapor pressure of 1.00 atm at -108.0 ∘\circ∘ C.What is the vapor pressure of xenon at -148.0 ∘\circ∘ C? (R = 8.314 J/K.mol)

Correct AnswerverifiedShow Answer

Ethanol has an enthalpy of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3 ^$\circ$C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.314 J/K.mol)

Correct Answer
verified

As pure molecular solids,which of the following exhibits dipole-dipole intermolecular forces: HBr,NBr₃,SBr₂,and CBr₄?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which of the following has the $\underline{\text{ greatest }}$ boiling point?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Arrange H₂S,H₂Se,and H₂Te in order from lowest to highest boiling point.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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At its boiling point of 58.8 ^$\circ$C,4.39 kJ of heat is required to vaporize 23.4 g of bromine (Br₂) .What is the molar enthalpy of vaporization of bromine?

Correct Answer
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Xenon has an enthalpy of vaporization of 12.6 kJ/mol and a vapor pressure of 1.00 atm at -108.0 ^$\circ$C.What is the vapor pressure of xenon at -148.0 ^$\circ$C? (R = 8.314 J/K.mol)

Correct Answer
verified