Chapter 9:
Chemical Bonding
Practice Test
1.
The arrangement of electron pairs around each of the two carbon atoms in the ethene molecule, C
2
H
4
, is best described as _________________.
a.
tetrahedral
b.
trigonal planar
c.
linear
d.
square planar
Hint
2.
When strontium atoms react with oxygen atoms, they form __________ bonds.
a.
covalent
b.
polar covalent
c.
triple
d.
ionic
Hint
3.
An intermediate difference in electronegativity results in a/an ___________________ bond.
a.
polar covalent
b.
ionic
c.
covalent
d.
weak
Hint
4.
What is the most stable arrangement of three electron pairs attached to a central atom?
a.
hexagonal
b.
trigonal planar
c.
pyramidal
d.
tetrahedral
Hint
5.
Water molecules stick together to form droplets because of their ___________.
a.
masses
b.
polarities
c.
covalencies
d.
volumes
Hint
6.
The CO
2
molecule is _____________.
a.
pyramidal
b.
hexagonal
c.
trigonal planar
d.
linear
Hint
7.
In general, electronegativity ___________ atomic number within a period.
a.
is inversely proportional to
b.
increases with
c.
remains constant with
d.
decreases with
Hint
8.
The CCl
4
molecule is _________________.
a.
linear and nonpolar
b.
tetrahedral and polar
c.
tetrahedral and nonpolar
d.
octahedral and polar
Hint
9.
A chemical bond that results from a shared pool of valence electrons is called a ____________ bond.
a.
polar covalent
b.
metallic
c.
directional
d.
ionic
Hint
10.
___________ sharing of electrons results in ionic bonding.
a.
Slightly unequal
b.
Highly unequal
c.
Electronegative
d.
Equal
Hint
11.
Atoms that share electrons form __________ bonds.
a.
quartets
b.
ionic
c.
covalent
d.
quantitative
Hint
12.
The boiling point of methane, CH
4
, is ___________ than that of water.
a.
much higher
b.
much lower
c.
slightly higher
d.
slightly higher
Hint
13.
The shielding effect is the tendency of inner energy level electrons to block the attraction of the nucleus for ________________.
a.
valence electrons
b.
protons
c.
neutrons
d.
other atoms
Hint
14.
Chemical bonding results in ________________.
a.
lower density
b.
decreased stability
c.
increased stability
d.
longer bond lengths
Hint
15.
KF is a/an _______________ formula, which shows the ratio of potassium and fluoride ions in crystalline potassium fluoride.
a.
empirical
b.
double
c.
covalent
d.
molecular
Hint
16.
The arrangement of electron pairs around the nitrogen atom in the ammonia molecule, NH
3
, is best described as _______________.
a.
tetrahedral
b.
linear
c.
pyramidal
d.
square planar
Hint
17.
Atoms that transfer electrons form __________ bonds.
a. ionic
b. coordinate
c. dative
d. covalent
Hint
18.
The center of positive charge in the H
2
O molecule lies ______________________.
a.
in the geometric center of the molecule
b.
between the two hydrogen atoms
c.
on the oxygen atom
d.
on one of the hydrogen atoms
Hint
19.
The type of analysis based on the movements of a stationary phase and a mobile phase is called _____________.
a.
photography
b.
titration
c.
phase movement
d.
chromatography
Hint
20.
An arrow points in the direction of the _______________ of a polar covalent molecule.
a.
negative end
b.
positive end
c.
center
d.
bottom
Hint
