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