Bonding: General Concepts - Chemistry Worksheet (Answers) Page 2
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1
2
3Chem 121
Sp 2014
21. Which of the following sets of atoms and ions has the members arranged in order of increasing size?
3+
4+
3-
2-
3-
2-
3+
4+
4+
3+
3-
2-
4+
3+
2-
3-
2-
3-
4+
3+
Al
< Si
< P
< S
P
< S
< Al
< Si
Si
< Al
< P
< S
Si
< Al
< S
< P
S
< P
< Si
< Al
3-
-
+
2-
3+
22. Which ion in the isoelectronic series below has the largest radius?
N
F
Na
O
Al
23. By referring only to the periodic table, arrange the following in order of increasing electronegativity:
Ga, P, As, S, O, F
Ga < As < S < P < O < F
As < Ga < P < S < O < F
Ga < P < As < S < O < F
Ga < As < P < O < S < F
Ga < As < P < S < O < F
Ga < As < P < S < F < O
24. By referring only to the periodic table, arrange the following atoms in order of increasing electronegativity. Al, Si, S, P, In, Ga
S < P < Si < Al < Ga < In
In < Ga < Al < S < P < Si
In < Ga < Al < Si < P < S
Al < Si < P < S < Ga < In
Al < Ga < In < Si < P < S
25. Which of the atoms below is the most electronegative?
F
Ca
Rb
Si
Cl
26. Which order is correct for increasing polarity (least polar first)?
Si-Cl
S-Cl
P-Cl
Si-Si
A
B
C
D
A < B < C < D
D < B < C < A
C < B < D < A
C < D < B < A
D < C < B < A
27. Which combination of atoms would most likely produce a covalent bond?
Cd, Cl
Fe, S
Cu, Se
K, O
N, F
28. How many valence electrons are involved in writing the Lewis structure of AsF
?
5
8
21
32
26
3
29. In which of the following are there two bonding pairs and two nonbonding pairs on an atom? PH
BF
CH
OF
BeCl
NCl
3
3
4
2
2
3
+
-
-
30. Predict the order of the N-O bond lengths in NO
, NO
, and NO
.
2
3
+
-
+
-
+
-
-
-
NO
shortest, NO
longest
NO
shortest, NO
longest
NO
longest, NO
shortest
NO
shortest, NO
longest
2
3
2
3
2
31. Consider the molecule H
N-CH
-CH
-CO
H. Examine the Lewis structure for this molecule and determine which of the following
2
2
2
2
statements is incorrect.
There are eleven single bonds in this molecule.
There are three single bonds and one lone pair of electrons around the N atom.
There is one double bond in this molecule.
There are five lone pairs of electrons in this molecule.
There is one oxygen-oxygen bond in this molecule.
32. What is the number of bonding and nonbonding electron pairs around the central atom in each of the following?
NH
, H
S, CO
3
2
2
NH
: (3 bonding, 1 nonbonding); H
S: (2 bonding, 1 nonbonding); CO
: (4 bonding, 0 nonbonding)
3
2
2
NH
: (3 bonding, 1 nonbonding); H
S: (2 bonding, 2 nonbonding); CO
: (2 bonding, 0 nonbonding)
3
2
2
NH
: (3 bonding, 0 nonbonding); H
S: (2 bonding, 1 nonbonding); CO
: (4 bonding, 0 nonbonding)
3
2
2
NH
: (3 bonding, 0 nonbonding); H
S: (2 bonding, 2 nonbonding); CO
: (4 bonding, 0 nonbonding)
3
2
2
NH
: (3 bonding, 1 nonbonding); H
S: (2 bonding, 2 nonbonding); CO
: (4 bonding, 0 nonbonding)
3
2
2
-
-
-
33. Which of the following molecules has two resonance structures?
CO
CH
ClO
CH
CO
NO
2
4
4
3
2
3
34. Use bond enthalpies to estimate the enthalpy change for the following gas-phase reaction:
CH
+ Cl
→ CH
Cl
+ H
4
2
2
2
2
-45 kJ/mol
35. How many pairs of electrons are there around the central atom in the Lewis structure of SeF
?
4
2
6
3
5
4
36. Arrange the following in order of increasing C-C bond lengths:
HCCH,
H
CCH
,
H
CCH
2
2
3
3
H
CCH
< HCCH < H
CCH
H
CCH
< H
CCH
< HCCH
HCCH < H
CCH
< H
CCH
HCCH < H
CCH
< H
CCH
2
2
3
3
3
3
2
2
3
3
2
2
2
2
3
3
37. Which of the following orders of electronegativity is incorrect?
I < Br < Cl
C < N < O
C < Si < P
Se < S < O
Si < P < N
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