lewis structure, geometry, bonding plus - answer key

LEWIS STRUCTURES, GEOMETRY, BONDING PLUS . . .
EXTRA PRACTICE: CHEMICAL BONDING - UNIT 06
______________________________________________________________
1.
2.
3.
4.
5.
6.
To the right is a dot picture of SOF4.
Draw the most stable resonance
structure and state why it is more stable.
What is the electron domain geometry
and the molecular geometry of this
molecule?
F
F
F
S
-1
O
O
To the right is a dot picture of
S2CNCH3CH3−.
Draw two more
resonance structures and rank them
according to their stability. Justify the
reasoning for your order.
O
O
O
S
C
N
To the right is a dot picture of SeCN−.
Draw two more resonance structures
and rank them according to their
stability. Justify the reasoning for your
order.
O
CH 3
C
N
S
CH3
C
N
O
H
O
C
(A)
CH3
H
C
(B)
S
S
C
N
S
CH3
CH3
tied for
stability
See additional sheet with
question 6 answers.
-1
Se
Only one atom with
F.C. (-) FC on most
electroneg element.
-1
CH 3
S
S
F
S
F
No formal charge
on S or O.
F
F
F
S
F
S
F
To the right is a Lewis dot picture of
SO3F−. Draw the most stable resonance
form of this ion and state why it more
stable. What is the electron domain
geometry and the molecular geometry
of this ion?
Explain why structure B is a more stable
resonance structure than A for the given
compound.
O
O
S
B is better because F.C. is
on a more electronegative
element.
For each of the following species, draw the most stable dot representation. Also, state the steric number, electron domain
geometry, molecular geometry, hybridization of the central atom, and molecular polarity (P or NP). Your work should be
on a separate sheet of paper.
a.
b.
c.
d.
S2O42− (no need to give shape or molecular polarity)
H3PO3
PH2−
XeO3
e. O3
f. XeO2O2
g. C2Cl2
h. SeF4
Answer the following multiple choice by selecting the best answer choice.
7. Which of the following is least likely to violate the octet rule?
(a) Be
8.
(c) S
(d) B
(e) F
How many electrons are shown in the Lewis structure of perchlorate ion?
(a) 30
9.
(b) P
(c) 32
(b) 31
(d) 50
(e) 51
As the bond order of a carbon-carbon bond increases, which of the following decreases?
(a) # of e− between C atoms
(b) vibrational frequency of
bond vibrations
(c) bond energy (bond
strength)
(d) bond length
10. Which of the following bonds is most polar?
(a) N−Cl
Page 1 of 3
(b) C−N
(c) S−S
(d) Br−Br
(e) S−O
New 2014-2015 - LCA
LEWIS STRUCTURES, GEOMETRY, BONDING PLUS . . .
EXTRA PRACTICE: CHEMICAL BONDING - UNIT 06
______________________________________________________________
11. Which of the following molecular shapes has six atoms joined to a central atom?
(a) linear
(b) tetrahedral
(c) octahedral
(d) trigonal
bipyramidal
(e) trigonal planar
(d) trigonal
bipyramidal
(e) trigonal planar
(d) sp3d
(e) sp3d2
12. Which molecular shape has bond angles which are not all the same?
(a) linear
(b) tetrahedral
(c) octahedral
13. Which hybridization is associated with a steric number of 3?
(a) sp
(b) sp2
(c) sp3
14. The molecule BrF3 has a steric number of ___ on the central atom.
(a) 3
(b) 4
(c) 5
(d) 6
(c) sp3
(d) sp3d
(e) sp3d2
(c) 3
(d) 4
(e) 5
(d) sp3d
(e) sp3d2
(d) see saw
(e) trig. bipyramidal
(d) 120o
(e) 78.5o
15. What is the hybridization of Br in BrF3?
(a) sp
(b) sp2
16. How many equivalent sp3d orbital are there?
(a) 1
(b) 2
17. What type of hybridization is associated with square planar geometry?
(a) sp
(b) sp2
(c) sp3
18. What electron domain geometry is associated with sp3d2 hybridization?
(a) trigonal pyramidal
(b) octahedral
(c) tetrahedral
19. What angle exists between orbitals in sp3d2 hybrid orbitals?
(a) 90o
(b) 180o
(c) 109.5o
20. Which of the following elements is most likely to display sp3d hybridization?
(a) oxygen
Page 2 of 3
(b) nitrogen
(c) phosphorus
(d) carbon
(e) boron
New 2014-2015 - LCA
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BONDING PLUS . . .
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