BASIC CONCEPTS OF CHEMICAL BONDING
1. Which pair of atoms should form the most polar bond?
' and B
ii
1
1
1
:
he
B)
C) FandO
D) NandF
E) BandN
- l"f •1^v
I
f
-W
O
2.
W/zz'c/z pazr o/zons should form the ionic lattice with the highest energy?
f »*5*l'.
16
A) Na*andBr
,
B) Li* and FC) Of and F
Li" and O2E)
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3. The electrostatic force of attraction is greatest in which compound?
A) BaO
MgO
H
C) CaS
•
D) MgS
E) CaO
4. Which molecule has the weakest bond?
A) CO
B) O,
C) NO
Cl
5. For which species are octet resonance structures necessary and sufficient to describe the bonding satisfactorily?
A) BCl}
^ so'
Q CO,
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TOPIC
D)
*
E) SO/-
6. How are the bonding pairs arranged in the best Leivis structure for ozone?
A)
o-o-o
0=0-0
0 pr^ - f
^
J-
I
I
0=0-0
D)
E)
7. Which species has the shortest bond length?
B) 02
C) S02
D) S03
E) CO,
8.
Which species requires the least amount of energy to remove an
electron from the outermost energy level?
A) Mr
B) He
E)
9. Which species has a valid non-octet Lewis structure?
A) GeCl4
B) SiF4
C)
NH;
SeCl4
E)
co/
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10. The Lewis structure for SeS2 has a total of
A) 2 bonding pairs and 7 nonbonding pairs.
B) 2 bonding pairs and 6 nonbonding pairs.
3 bonding pairs and 6 nonbonding pairs.
a*
<f* -- ^°<
.,' 1 «!, J «
safol
BASIC CONCEPTS OF CHEMICAL BONDING
k
D) 4 bonding pairs and 5 nonbonding pairs.
E) 5 bonding pairs and 4 nonbonding pairs.
Free Response Questions
1. Consider the following chemical species: the nitrogen molecule, the
nitrite ion and the nitrate ion.
a.
Write the chemical formulas for each of the species and identify the
oxidation number of the nitrogen atom in each formula.
b. Draw Leiois structures for each of the species. Where appropriate,
draw resonance structures for each.
c. List the chemical species in order of increasing N-O bond length, the
formula with the shortest bond first. Justify your answer.
d.
Write a balanced net ionic equation for the reaction of nitrogen
dioxide with water. Comment on the molecular and/or ionic species
that are formed.
e.
Draw each of the resonance structures for nitrogen monoxide and
assign formal charges to each atom of each structure.
2. Carbon dioxide gas is bubbled into water.
a.
Write and balance a chemical equation to describe the process.
b. Draw the Lewis structures of the reactants and products. Include
any valid resonance structures.
c.
Given the following bond enthalpies, estimate the enthalpy of the reaction.
Bond
Bond enthalpy
H—H
436
H—O
463
O—O
246
C—O
358
C=O
799
(kj/mol)
2072
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d. Are the C—O bonds in the reactant stronger or weaker than those in
the product? Explain. Is your explanation consistent with the sign of
the enthalpy change you estimated? Explain.
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