Practice Problem Set
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3CH 222 Practice Problem Set #2
This is a practice problem set and not the actual graded problem set that you will turn in for credit.
Answers to each problem can be found at the end of this assignment.
Covering: Chapter Eight and Chapter Guide Two
Important Tables and/or Constants: "MO Diagram for B
, C
, and N
" (Handout), "MO Diagram for O
, F
, and
2
2
2
2
2
Ne
" (Handout), "Geometry and Polarity Guide" (Handout)
2
1. Draw the Lewis structure for chloroform, CHCl
. What are its electron-pair and molecular
3
geometries? What orbitals on C, H, and Cl overlap to form bonds involving these elements?
2. Specify the electron-pair and molecular geometry for each of the following. Describe the
hybrid orbital set used by the central atom in each molecule or ion.
a. BBr
b. CO
c. CH
Cl
d. CO
3 2-
3
2
2
2
3. Draw the Lewis structure and then specify the electron- pair and molecular geometries for
each of the following molecules or ions. Identify the hybridization of the central atom.
a. SiF
6 2-
b. SeF
c. ClF
2 1-
d. XeF
4
4
4. The hydrogen molecular ion, H
2 +
, can be detected spectroscopically. Write the electron
configuration of the ion in molecular orbital terms. What is the bond order of the ion? Is the
hydrogen–hydrogen bond stronger or weaker in H
2 +
than in H
?
2
5. Calcium carbide, CaC
, contains the acetylide ion, C
2 2-
. Sketch the molecular orbital energy
2
level diagram for the ion. How many net σ and π bonds does the ion have? What is the
carbon–carbon bond order? How has the bond order changed on adding electrons to C
to
2
obtain C
2 2-
? Is the C
2 2-
ion paramagnetic?
6. The simple valence bond picture of O
does not agree with the molecular orbital view.
2
Compare these two theories with regard to the peroxide ion, O
2 2-
.
(a) Draw an electron dot structure for O
2 2-
. What is the bond order of the ion?
(b) Write the molecular orbital electron configuration for O
2 2-
. What is the bond order based
on this approach?
(c) Do the two theories of bonding lead to the same magnetic character and bond order for
O
2 2-
?
7. Which of the homonuclear, diatomic molecules of the second-period elements (from Li
to
2
Ne
) are paramagnetic? Which have a bond order of 1? Which have a bond order of 2?
2
Which diatomic molecule has the highest bond order?
8. Consider the three fluorides BF
4 -1
, SiF
, and SF
.
4
4
a. Identify a molecule that is isoelectronic with BF
1-
.
4
b. Are SiF
and SF
isoelectronic?
4
4
c. What is the hybridization of the central atom in each of these species?
9. When is it desirable to use MO theory rather than valence bond theory?
10. Antimony pentafluoride reacts with HF according to the equation:
2 HF + SbF
→ [H
F]
+
[SbF
]
-
5
2
6
a. What is the hybridization of the Sb atom in the reactant and product?
b. Draw a Lewis structure for H
F. What is the geometry of H
F
+
? What is the hybridization
2
2
of F in H
F
+
?
2
Page VI-2- 1 / Practice Problem Set #2
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