Ch. 9.2-9.3
Worksheet
Tina
Course:
Chem 177
Instructor:
Supplemental Instruction
Iowa State University
1.
Leader:
Dr. Holme
Date: 11/5/15
In the Lewis structure for SCl2O, the formal charges are:
a) 0, 0, 0
b) +1, 0, –2
c) +1, 0, –1
on S,
on the Cl atoms, and
d) +4, –1, –2
2.
Based on VSEPR theory, which should have the smallest XAX bond angle?
3.
The molecular geometry of phosphorus trichloride PCl3 is
4.
a) trigonal planar
b) trigonal pyramidal
d) bent
e) T–shape
.
c) tetrahedral
What is the approximate Cl–P–Cl bond angle in phosphorus trichloride PCl3?
a) 90˚
b) 109.5˚
c) 120˚
d) 180o
on O.
e) –1, 0, +1
5.
The bond angles marked a, b, and c in the molecule below are approximately
, respectively.
a) 109.5˚, 109.5˚, 109.5˚
b) 120˚, 109.5˚, 120˚
c) 109.5˚, 109.5˚, 90˚
d) 90˚, 90˚,90˚
,
, and
e) 109.5˚, 109.5˚, 120˚
6.
A. (2 pts) Draw the Lewis structure for PCl3F2. Include lone pairs.
B. (2 pts) The more electronegative the atoms bonded to the central atom, the less are the repulsions
between the electron pairs in the bonds. On the basis of this statement, draw the most probable
structure of the molecule PCl3F2. If you did not arrive at a Lewis structure in part A, use this:
Cl
F
F
S
Cl
F
F
C. (2 pts) What is the name of the shape or geometry of the molecule?
D. (3 pts) indicate the bond angles in the molecule.
Bond
F – A – Cl
angle
Cl – A – Cl
F–A–F
E. (1 pts) Is this molecule polar or nonpolar?
“A” refers to the central atom.