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Chapter 11 Intermolecular Forces

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Based on molecular mass and dipole moment of the five compounds in the table below, which should have the highest boiling point?

mc001-1.jpg
a.
CH3CH2CH3
b.
CH3OCH3
c.
CH3Cl
d.
CH3CHO
e.
CH3CN
 

 2. 
Of the following substances, only __________ has London dispersion forces as its only intermolecular force.
a.
CH3OH
b.
NH3
c.
H2S
d.
CH4
e.
HCl
 

 3. 
Of the following substances, __________ has the highest boiling point.
a.
H2O
b.
CO2
c.
CH4
d.
Kr
e.
NH3
 

 4. 
The substance with the largest heat of vaporization is __________.
a.
I2
b.
Br2
c.
Cl2
d.
F2
e.
O2
 

 5. 
Of the following, __________ is an exothermic process.
a.
melting
b.
subliming
c.
freezing
d.
boiling
e.
All of the above are exothermic.
 

 6. 
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 22.0°C requires __________ kJ of heat.
a.
3.8 ´ 102
b.
21.3
c.
17.2
d.
0.469
e.
Insufficient data are given.
 
 
nar001-1.jpg
 

 7. 
The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated. The slope of the __________ segment corresponds to the heat capacity of the liquid of the substance.
a.
AB
b.
BC
c.
CD
d.
DE
e.
EF
 
 
nar002-1.jpg
 

 8. 
On the phase diagram shown above, segment __________ corresponds to the conditions of temperature and pressure under which the solid and the gas of the substance are in equilibrium.
a.
AB
b.
AC
c.
AD
d.
CD
e.
BC
 

 9. 
On the phase diagram shown above, the coordinates of point __________ correspond to the critical temperature and pressure.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 10. 


mc010-1.jpg

The phase diagram of a substance is given above. The region that corresponds to the solid phase is __________.
a.
w
b.
x
c.
y
d.
z
e.
x and y
 

 11. 
Gallium crystallizes in a primitive cubic unit cell. The length of the unit cell edge is 3.70Å. The radius of a Ga atom is __________ Å.
a.
7.40
b.
3.70
c.
1.85
d.
0.930
e.
Insufficient data is given.
 

 12. 
Potassium metal crystallizes in a body-centered cubic structure with a unit cell edge length of 5.31 Å. The radius of a potassium atom is __________ Å.
a.
1.33
b.
1.88
c.
2.30
d.
2.66
e.
5.31
 

 13. 
In liquids, the attractive intermolecular forces are __________.
a.
very weak compared with kinetic energies of the molecules
b.
strong enough to hold molecules relatively close together
c.
strong enough to keep the molecules confined to vibrating about their fixed lattice points
d.
not strong enough to keep molecules from moving past each other
e.
strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other
 

 14. 
When NaCl dissolves in water, aqueous Na+ and Cl- ions result. The force of attraction that exists between Na+ and H2O is called a(n) __________ interaction.
a.
dipole-dipole
b.
ion-ion
c.
hydrogen bonding
d.
ion-dipole
e.
London dispersion force
 

 15. 
Hydrogen bonding is a special case of __________.
a.
London-dispersion forces
b.
ion-dipole attraction
c.
dipole-dipole attractions
d.
ion-ion interactions
e.
none of the above
 

 16. 
Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?
a.

mc016-1.jpg
b.

mc016-2.jpg
c.

mc016-3.jpg
d.

mc016-4.jpg
e.

mc016-5.jpg
 



 
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