Bonding: General Concepts - Chemistry Worksheet (Answers) Page 3
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1
2
3Chem 121
Sp 2014
-
38. How many valence electrons are shown in the Lewis structure of CN
?
9
12
8
13
10
39. The C-O bond lengths in H
CO are shorter than would be expected for C-O single bonds. Rationalize this observation.
2
A triple bond is formed.
A double bond is formed.
The two hydrogens form bonds with each other.
Oxygen is more electronegative than carbon.
Carbon uses its d electrons to form stronger bonds.
40. Write Lewis structures for the following:
(i) HOBr
(ii) H
O
(the O atoms are bonded to one another)
(iii) H
CO (both H atoms are bonded to C)
2
2
2
Pick the incorrect response below.
There is a double bond in structure iii.
Oxygen in structure i has two nonbonded pairs of electrons.
The total number of bonds in structure ii is three.
There are double bonds between the oxygens in structure ii.
There are three nonbonding pairs of electrons around bromine in structure i.
-
-
41. What is the formal charge on the chlorine atom in the chlorite ion ClO
and the chlorate ion ClO
?
2
3
0, 1+
1+ in both
3+, 5+
0 in both
1+, 2+
2+ in both
42. Is the C-O bond in CH
OH longer or shorter than the C-O bond in CH
COCH
? Why?
3
3
3
longer; CH
COCH
is a bigger molecule.
3
3
shorter; CH
COCH
has a triple bond.
3
3
longer; CH
COCH
has a double
bond.
3
3
They are the same length.
shorter; CH
COCH
has a double bond.
3
3
-
43. Write a single, stable Lewis structure for ClO
. What are the formal charges on the atoms?
2
Cl 0; O 0
Cl 1-; O 0
Cl 1+; O 1-
Cl 0; O 0; O 1-
Cl 1-; O 1+
2-
2-
44. Using Lewis structures that satisfy the octet rule, determine the # of electrons around the central S atom in SO
and SO
.
3
4
10, 10
8, 12
8, 8
10, 12
6, 12
6, 8
45. Which is the best Lewis structure for COS? (Formal charges are not shown.)
C
S
O
S
C
O
S
C
O
S
C
O
C
O
S
46. The Lewis structures of which of the following compounds obey the octet rule?
2-
-
-
-
(i) SO
(ii) BH
(iii) I
(iv) AsF
(v) O
3
3
3
6
2
A) iv
B) i and v
C) v
D) iii
E) ii
F) i
-
47. How many pairs of electrons are there around the central atom in the Lewis structure of ICl
?
3
5
4
2
2
-
2-
2-
48. Which of the following does not exhibit bond resonance?
NO
O
SO
CO
H
O
2
3
4
3
2
2
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