CHEMISTRY 121
Problem Set #1
Distribution Date: Wed September 30 2020
Due Date: Friday October 9, 2020
(at beginning of class, 10:20 am)
Problems (8th Edition of OGB)
1a.
1b.
OGB 1-18
OGB 1-42
2.
OGB 1-38
3.
OGB 1-40
4a.
4b.
OGB 2-32
OGB 2-36
5a.
5b.
OGB 3-36
OGB 3-38
6.
OGB 3-100
7.
For each of the following molecules give the steric number, sketch and name the
approximate molecular geometry, and describe the direction of any distortions
from the approximate geometry due to lone pairs of substituents of different
electronegativities. In each case the central atom is listed first and the others are
bonded directly to it.
a) TeH2
b) AsF3
c) PCl3
d) CFCl3
e) IF5
8.
The rule that the number of covalent bonds an atom can form is related to the
possible number of unpaired valence electrons it can have is consistent with the
formulas of a large number of known compounds. Show that this rule leads to the
prediction of the existence of compounds like XeF2 and XeF4.
9.
PF3 has a dipole moment of 1.02 D as might be expected from the
electronegativities of P and F. What do you expect the dipole moment of SiF4 to
be? Explain your answer quantitatively. To prove the quantitative answer, sum
the x, y, and z vector components of each of the 4 local Si-F dipoles, µSiF; assume
that one of the Si-F bonds lies along the z-axis. (If you prefer, an equivalent
solution using spherical polar coordinates also quite acceptable.)
10.
OGB 3-64