More Ch 10 Problems
1. Classify as metallic, molecular, ionic or network covalent a solid that
a.
b.
c.
d.
e.
f.
is a nonconductor but conducts when melted
dissolves in water to give a non-conducting solution
melts below 100°C and reacts violently with water
conducts electricity as a solid
melts below 100°C to a give a non-conducting liquid
dissolves in water to a give a conducting solution
2. Of the four general types of solids which one(s)
a.
b.
c.
d.
e.
f.
are generally insoluble in water
are very high melting
conduct electricity as solids
are generally low boiling
are ductile and malleable
are generally nonvolatile
3. Classify the following species as being ionic, molecular, network covalent or
metallic at 25°C and 1 atm:
a.
b.
c.
d.
e.
PCl3
SiC
Bromine
MgO
Chromium
f. tungsten
g. IBr
h. quartz
i. iron (III) nitrate
j. carbon dioxide
4. Arrange the following in order of decreasing boiling point:
I2, F2, Cl2, Br2
5. Arrange the following in order of increasing boiling point:
Ar, He, Ne, Xe
6. Which of the following would you expect to show LDF? Dipole-dipole?
a.
b.
c.
d.
e.
CH4
CH3Cl
CH2Cl2
CHCl3
CCl4
7. Which of the following would show hydrogen bonding?
a.
b.
c.
d.
e.
f.
g.
CH3F
CH3—OH
CH3—O—CH3
HO—OH
CH4
NH3
H2N—NH2
8. Explain in terms of intermolecular forces why
a.
b.
c.
d.
e.
f.
g.
h.
i.
C2H6 has a higher boiling point than CH4
C2H5OH is higher boiling than C2H6
C2H5OH is lower boiling than NaF
O2 is higher boiling than N2
CO is slightly higher boiling than N2
H2O is higher boiling than H2Te
H2O2 is higher boiling than C2H6
I2 is lower melting than NaI
ICl is higher melting than Br2
9. In which of the following processes is it necessary to break covalent bonds?
Which are overcoming intermolecular forces?
a.
b.
c.
d.
e.
f.
dissolving I2 in water
boiling water
subliming dry ice, CO2
decomposing N2O4 to NO2
melting benzene
electrolysis of water
10. For each of the following pairs, choose the lower boiling member. EXPLAIN
YOUR REASONING.
a.
b.
c.
d.
F2 or Cl2
ClO2 or SiO2
LiCl or C3H8
HCl of HBr
e.
f.
g.
h.
H2 or O2
NH3 or PH3
PH3 or AsH3
SO2 or SiO2
11. What are the strongest attractive forces that must be overcome to
a.
b.
c.
d.
e.
f.
g.
melt ice?
Melt iodine?
Vaporize CaCl2?
Boil CCl4?
Melt benzene, C6H6?
Melt NaCl?
Boil SiH4?