Section 9.2
Molecular Shape and Polarity
Practice Test
1.
The CO
2
molecule is _____________.
a.
hexagonal
b.
linear
c.
pyramidal
d.
trigonal planar
Hint
2.
The center of positive charge in the H
2
O molecule lies ______________________.
a.
between the two hydrogen atoms
b.
on the oxygen atom
c.
in the geometric center of the molecule
d.
on one of the hydrogen atoms
Hint
3.
The arrangement of electron pairs around the nitrogen atom in the ammonia molecule, NH
3
, is best described as _______________.
a.
linear
b.
pyramidal
c.
square planar
d.
tetrahedral
Hint
4.
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.
trigonal planar
b.
tetrahedral
c.
linear
d.
square planar
Hint
5.
Two atoms that share six electrons are said to be joined by a __________ bond.
a.
double
b.
hexyl
c.
single
d.
triple
Hint
6.
The type of analysis based on the movements of a stationary phase and a mobile phase is called _____________.
a.
chromatography
b.
photography
c.
titration
d.
phase movement
Hint
7.
Water molecules stick together to form droplets because of their ___________.
a.
polarities
b.
masses
c.
volumes
d.
covalencies
Hint
8.
The CO molecule is _____________________.
a.
linear and polar
b.
tetrahedral and nonpolar
c.
linear and nonpolar
d.
trigonal planar and polar
Hint
9.
The boiling point of methane, CH
4
, is ___________ than that of water.
a.
much lower
b.
slightly higher
c.
much higher
d.
slightly higher
Hint
10.
The CCl
4
molecule is _________________.
a.
linear and nonpolar
b.
octahedral and polar
c.
tetrahedral and nonpolar
d.
tetrahedral and polar
Hint
11.
In general, electronegativity ___________ atomic number within a period.
a.
decreases with
b.
increases with
c.
is inversely proportional to
d.
remains constant with
Hint
