Chapter 9:
Covalent Bonding
Practice Test
1.
What is the formula for the binary compound of aluminum and nitrogen?
a.
Al
2
N
2
b.
AlN
c.
Al
2
N
d.
AlN
2
Hint
2.
To determine the number of bonding electron pairs, you must divide the number of electrons available for bonding by _______.
a.
2
b.
4
c.
3
d.
1
Hint
3.
What is the chemical formula for dintrogen hexoxide?
a.
NO
5
b.
N
2
O
5
c.
NO
2
d.
N
2
O
6
Hint
4.
What is the correct name for HBr in an aqueous solution?
a.
hydrobromic acid
b.
bromous acid
c.
hydrogen bromide
d.
bromic acid
Hint
5.
Which element can share only one pair of electrons?
a.
O
b.
H
c.
C
d.
N
Hint
6.
How many sigma and how many pi bonds are present in the ethene molecule (C
2
H
4
)?
a.
5 sigma and 1 pi
b.
5 sigma and 2 pi
c.
4 sigma and 2 pi
d.
4 sigma and 1 pi
Hint
7.
Many simple molecules contain two lone pairs around the central atom. Which type of electron—to—electron repulsions are smallest in these molecules?
a.
bonding pair to lone pair
b.
lone pair to lone pair
c.
All repulsions are equal.
d.
bonding pair to bonding pair
Hint
8.
Which element has the highest electronegativity?
a.
N
b.
O
c.
Ne
d.
F
Hint
9.
How many lone pairs of electrons are present in a molecule of water?
a.
2
b.
3
c.
4
d.
1
Hint
10.
What is the charge on the simple monatomic ion that sulfur forms?
a.
1+
b.
2-
c.
1–
d.
2+
Hint
11.
In forming a molecular structure, each atom should have ________ electrons around it unless there is some specific reason why this cannot be achieved.
a.
6
b.
8
c.
2
d.
4
Hint
12.
The Lewis dot formula for I2 shows a _________.
a.
double covalent bond
b.
single covalent bond
c.
total of 8 × 2 = 16 electrons
d.
single ionic bond
Hint
13.
The phosphorus pentachloride molecule is nonpolar and contains no unshared electron pairs on the phosphorus atom. What are all the possible bond angles in this molecule?
a.
120°
b.
90° and 180°
c.
90°, 120°, and 180°
d.
180°
Hint
14.
When two or more Lewis structures can be used to represent a single molecule, these multiple structures are ______________.
a.
polar structures
b.
liquid structures
c.
isomeric structures
d.
resonance structures
Hint
15.
What hybridization is present in an octahedral molecular geometry?
a.
sp
3
d
2
b.
sp
3
d
c.
sp
3
d.
Sp
2
Hint
16.
The correct molecular compound name for H
2
O
2
is ________.
a.
dihydrogen monoxide
b.
hydrogen dioxide
c.
hydrogen oxide
d.
dihydrogen dioxide
Hint
17.
Which compound consists of nonpolar molecules?
a.
AsH
3
b.
H
2
S
c.
SiH
4
d.
PH
3
Hint
18.
Single covalent bonds are also referred to as ___________.
a.
pi bonds
b.
delta bonds
c.
sigma bonds
d.
hydrogen bonds
Hint
19.
What is the correct name for H
2
SO
3
in an aqueous solution?
a.
hydrosulfuric acid
b.
sulfurous acid
c.
hydrosulfic acid
d.
sulfuric acid
Hint
20.
Which of the following atoms will be an exception to the octet rule in a molecule?
a.
C
b.
O
c.
B
d.
N
Hint
