Covalent Bonding
Practice Test
1.
In forming a molecular structure, each atom should have ________ electrons around it unless there is some specific reason why this cannot be achieved.
a.
4
b.
2
c.
8
d.
6
2.
What is the chemical formula for dintrogen hexoxide?
a.
N
2
O
6
b.
NO
2
c.
NO
3
d.
N
2
O
5
3.
Which of the following bond length represents the strongest bond?
a.
1.43 x 10
-10
m
b.
0.95 x 10
-10
m
c.
1.10 x 10
-10
m
d.
1.21 x 10
-10
m
4.
Which element can share only one pair of electrons?
a.
O
b.
H
c.
C
d.
N
5.
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.
90°, 120°, and 180°
c.
120°
d.
90° and 180°
6.
How many lone pairs of electrons are present in a molecule of water?
a.
1
b.
3
c.
4
d.
2
7.
When two or more atoms join together by sharing their outermost electrons, ________.
a.
a mixture is formed
b.
a molecular compound is formed
c.
a solution is formed
d.
an ionic compound is formed
8.
Many simple molecules contain two lone pairs around the central atom. Which type of electron—to—electron repulsions are smallest in these molecules?
a.
lone pair to lone pair
b.
bonding pair to lone pair
c.
bonding pair to bonding pair
d.
All repulsions are equal.
9.
In the compound H
2
SO
4
, which element will be the central atom in the molecular structure?
a.
both S and O
b.
H
c.
S
d.
O
10.
Which element has the highest electronegativity?
a.
F
b.
O
c.
Ne
d.
N
11.
What is the charge on the simple monatomic ion that sulfur forms?
a.
1
–
b.
1
+
c.
2
-
d.
2
+
12.
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
13.
When two or more Lewis structures can be used to represent a single molecule, these multiple structures are ______________.
a.
resonance structures
b.
liquid structures
c.
isomeric structures
d.
polar structures
14.
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
15.
Which compound consists of nonpolar molecules?
a.
AsH
3
b.
PH
3
c.
SiH
4
d.
H
2
S
16.
Single covalent bonds are also referred to as ___________.
a.
hydrogen bonds
b.
delta bonds
c.
sigma bonds
d.
pi bonds
17.
What hybridization is present in an octahedral molecular geometry?
a.
sp
2
b.
sp
3
d
2
c.
sp
3
d.
sp
3d
18.
Side—on overlaps of atomic orbitals are also referred to as ___________.
a.
delta bonds
b.
hydrogen bonds
c.
sigma bonds
d.
pi bonds
19.
What is the formula for the binary compound of potassium and chlorine?
Binary Molecular Compound
Binary Acid
Contains only two different elements
Contains hydrogen and one other element
Second element uses name + -ide
Uses hydro + root of second element + -ic and acid
a.
K
2
ClO
3
b.
KCl
c.
KCl
2
d.
KHCl
20.
Large differences in electronegativity result in __________ bonding between atoms.
a.
ionic
b.
no
c.
covalent
d.
polar
21.
What is the correct name for HBr in an aqueous solution?
a.
hydrobromic acid
b.
hydrogen bromide
c.
bromic acid
d.
bromous acid
