Question 1

________ is the energy required to expand the surface area of a liquid by a unit amount of area.

Accepted Answer

A)  Viscosity
B)  Surface tension
C)  Volatility
D)  Meniscus
E)  Capillary action

Question 2

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

Accepted Answer

A)  CH3CH2-C(CH3) 2-CH2CH3
B)  CH3CH2CH2CH2CH2CH2CH2CH3
C)  CH3CH2CH2CH2CH2-   3CH2-C(CH3) 2-CH2CH3 
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2-     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   3CH2-C(CH3) 2-CH2CH3 
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2-     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   3CH2-C(CH3) 2-CH2CH3 
B)  CH3CH2CH2CH2CH2CH2CH2CH3 
C)  CH3CH2CH2CH2CH2-     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >

Question 3

On the phase diagram shown above,the coordinates of point ________ correspond to the triple point.

Accepted Answer

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

Question 4

Some things take longer to cook at high altitudes than at low altitudes because ________.

Accepted Answer

A)  water boils at a lower temperature at high altitude than at low altitude
B)  water boils at a higher temperature at high altitude than at low altitude
C)  heat isn't conducted as well in low density air
D)  natural gas flames don't burn as hot at high altitudes
E)  there is a higher moisture content in the air at high altitude

Question 5

What type(s) of intermolecular forces exist between NH3 and PO43-?

Accepted Answer

A)  dispersion forces
B)  dispersion forces, ion-dipole, and dipole-dipole
C)  dispersion forces and dipole-dipole
D)  dispersion forces and ion-dipole
E)  dispersion forces, ion-dipole, dipole-dipole, and hydrogen bonds D

Question 6

A gas is ________ and assumes ________ of its container,whereas a liquid is ________ and assumes ________ of its container.

Accepted Answer

A)  compressible, the volume and shape, not compressible, the shape of a portion
B)  compressible, the shape, not compressible, the volume and shape
C)  compressible, the volume and shape, compressible, the volume
D)  condensed, the volume and shape, condensed, the volume and shape
E)  condensed, the shape, compressible, the volume and shape A

Question 7

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.

Question 8

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

Question 9

The enthalpy change for converting 10.0 g of ice at -50.0 °C to water at 50.0 °C is ________ kJ.The specific heats of ice,water,and steam are   and  respectively.For  O,Δ  = 6.01 kJ/mol,and  .

Accepted Answer

A)  12.28
B)  4.38
C)  3138
D)  6.47
E)  9.15

Question 10

The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated.The heat flow into the sample in the segment D-E will yield the value of the ________ of this substance.

Accepted Answer

A)  ΔHsub
B)  ΔHvap
C)  ΔHmelting
D)  ΔHfusion
E)  ΔHrxn

Question 11

What is the predominant intermolecular force in HCN?

Accepted Answer

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

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

With what compound will NH3 experience only ion-dipole intermolecular forces?

Accepted Answer

A)  LiCl
B)  SiH4
C)  CH3I
D)  C3H7OH
E)  OCl2

Question 14

The ________ (is) are associated with the heat energy being used up to increase distances between molecules.

Accepted Answer

A)  phase change B → C
B)  phase changes B → C and D → E
C)  phase change D → E
D)  phase change B → E
E)  phase change C → E

Question 15

________ liquid crystals are colored and change color with temperature changes.

Accepted Answer

A)  Smectic A
B)  Nematic
C)  Cholesteric
D)  Smectic B
E)  Smectic C

Question 16

Which of the following molecules has London Forces as its only intermolecular force?

Accepted Answer

A)  H2O
B)  CH3CH2NH2
C)  HOCH2CH2OH
D)  CH3CH3
E)  None, all of the above exhibit dispersion forces.

Question 17

Which compound has the strongest intermolecular forces?

Accepted Answer

A)  CCl4
B)  CI4
C)  CH4
D)  H2
E)  O2

Question 18

According to the phase diagram shown above,what is the normal boiling point (°C) ?

Accepted Answer

A)  10
B)  -3
C)  38
D)  29
E)  0

Question 19

With what compound will NH3 experience only dispersion intermolecular forces?

Accepted Answer

A)  BF3
B)  LiF
C)  CH3I
D)  CH3OH
E)  HCN

Question 20

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 A

Exam 11: Liquids and Intermolecular Forces

________ is the energy required to expand the surface area of a liquid by a unit amount of area.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

On the phase diagram shown above,the coordinates of point ________ correspond to the triple point.

Correct AnswerverifiedShow Answer

Some things take longer to cook at high altitudes than at low altitudes because ________.

Correct AnswerverifiedShow Answer

What type(s) of intermolecular forces exist between NH3 and PO43-?

Correct AnswerverifiedD

A gas is ________ and assumes ________ of its container,whereas a liquid is ________ and assumes ________ of its container.

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The enthalpy change for converting 10.0 g of ice at -50.0 °C to water at 50.0 °C is ________ kJ.The specific heats of ice,water,and steam are and respectively.For O,Δ = 6.01 kJ/mol,and .

Correct AnswerverifiedShow Answer

The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated.The heat flow into the sample in the segment D-E will yield the value of the ________ of this substance.

Correct AnswerverifiedShow Answer

What is the predominant intermolecular force in HCN?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

With what compound will NH3 experience only ion-dipole intermolecular forces?

Correct AnswerverifiedShow Answer

The ________ (is) are associated with the heat energy being used up to increase distances between molecules.

Correct AnswerverifiedShow Answer

________ liquid crystals are colored and change color with temperature changes.

Correct AnswerverifiedShow Answer

Which of the following molecules has London Forces as its only intermolecular force?

Correct AnswerverifiedShow Answer

Which compound has the strongest intermolecular forces?

Correct AnswerverifiedShow Answer

According to the phase diagram shown above,what is the normal boiling point (°C) ?

Correct AnswerverifiedShow Answer

With what compound will NH3 experience only dispersion intermolecular forces?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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What type(s) of intermolecular forces exist between NH₃ and PO₄^3-?

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D

A gas is and assumes of its container,whereas a liquid is and assumes of its container.

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A

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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

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

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With what compound will NH₃ experience only ion-dipole intermolecular forces?

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With what compound will NH₃ experience only dispersion intermolecular forces?

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A