Covalent Bonding
Practice Test
1.
Which element can share only one pair of electrons?
a.
O
b.
C
c.
N
d.
H
2.
How many lone pairs of electrons are present in a molecule of water?
a.
4
b.
2
c.
3
d.
1
3.
When two or more atoms join together by sharing their outermost electrons, ________.
a.
an ionic compound is formed
b.
a solution is formed
c.
a molecular compound is formed
d.
a mixture is formed
4.
In forming a molecular structure, each atom should have ________ electrons around it unless there is some specific reason why this cannot be achieved.
a.
8
b.
4
c.
2
d.
6
5.
What hybridization is present in an octahedral molecular geometry?
a.
sp
3d
b.
sp
3
d
2
c.
sp
2
d.
sp
3
6.
Many simple molecules contain two lone pairs around the central atom. Which type of electron—to—electron repulsions are smallest in these molecules?
a.
All repulsions are equal.
b.
bonding pair to lone pair
c.
bonding pair to bonding pair
d.
lone pair to lone pair
7.
Single covalent bonds are also referred to as ___________.
a.
hydrogen bonds
b.
sigma bonds
c.
pi bonds
d.
delta bonds
8.
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°
9.
When two or more Lewis structures can be used to represent a single molecule, these multiple structures are ______________.
a.
polar structures
b.
resonance structures
c.
liquid structures
d.
isomeric structures
10.
What is the correct name for H
2
SO
3
in an aqueous solution?
a.
sulfurous acid
b.
hydrosulfuric acid
c.
sulfuric acid
d.
hydrosulfic acid
11.
Which element has the highest electronegativity?
a.
Ne
b.
F
c.
N
d.
O
12.
Side—on overlaps of atomic orbitals are also referred to as ___________.
a.
delta bonds
b.
hydrogen bonds
c.
pi bonds
d.
sigma bonds
13.
What is the charge on the simple monatomic ion that sulfur forms?
a.
1
+
b.
2
-
c.
2
+
d.
1
–
14.
Large differences in electronegativity result in __________ bonding between atoms.
a.
ionic
b.
covalent
c.
no
d.
polar
15.
Which compound consists of nonpolar molecules?
a.
PH
3
b.
AsH
3
c.
H
2
S
d.
SiH
4
16.
Which of the following is the formula for nitric acid?
Formula
Acid Name
H
2
SO
3
Sulfurous acid
H
2
SO
4
Sulfuric acid
a.
HNO
3
b.
HN
c.
HNO
2
d.
HNO
17.
To determine the number of bonding electron pairs, you must divide the number of electrons available for bonding by _______.
a.
1
b.
4
c.
3
d.
2
18.
What is the name of the aqueous solution of H
2
SO
4
?
a.
hydrogen persulfate
b.
sulfurous acid
c.
hydrogen persulfide
d.
sulfuric acid
19.
How many sigma and how many pi bonds are present in the ethene molecule (C
2
H
4
)?
a.
4 sigma and 2 pi
b.
4 sigma and 1 pi
c.
5 sigma and 1 pi
d.
5 sigma and 2 pi
20.
What is the formula for the binary compound of aluminum and nitrogen?
a.
Al
2
N
2
b.
Al
2
N
c.
AlN
2
d.
AlN
21.
What is the correct name for HBr in an aqueous solution?
a.
bromous acid
b.
bromic acid
c.
hydrogen bromide
d.
hydrobromic acid
