Section 5.2
Molecular Substances
Practice Test
1.
The formulas O
2
, P
4
, and S
8
show that oxygen, phosphorus, and sulfur are _______________.
a.
diatomic
b.
hydrates
c.
ionic elements
d.
molecular elements
Hint
2.
Diatomic oxygen and ozone are _____________.
a.
allotropes
b.
different elements
c.
isotopes
d.
ionic
Hint
3.
What is the name of the molecular compound NO
2
?
a.
dinitrogen dioxide
b.
nitrogen dioxide
c.
nitrogen dioxygen
d.
nitrite
Hint
4.
What is the formula for sulfur trioxide?
a.
SO
3
b.
S
3
O
c.
SO
3
2-
d.
SO
Hint
5.
In aqueous solution, H
2
SO
4
is called _______________.
a.
hydrogen sulfur oxide
b.
hydrogen sulfite
c.
nitric acid
d.
sulfuric acid
Hint
6.
C
5
H
12
is the formula for the hydrocarbon _____________.
a.
carbon hydride
b.
hexane
c.
methane
d.
pentane
Hint
7.
Name the ionic compound represented by the formula Mg(OH)
2
.
a.
magnesium hydroxide
b.
manganese hydroxide
c.
magnesium hydrate
d.
magnesium oxide
Hint
8.
What is the formula for the binary compound that forms when potassium and sulfur react?
a.
K
2
S
b.
KS
c.
KS
2
d.
K
2
SO
4
Hint
9.
Name the molecular compound represented by the formula PF
5
.
a.
phosphorus pentafluoride
b.
phosphorus(V) fluorine
c.
phosphorus fluorine
d.
phosphate
Hint
10.
If each carbon atom can form four bonds, why doesn't a two-carbon alkane have eight hydrogen atoms?
a.
Alkanes have double bonds leaving fewer bonds available for hydrogen atoms.
b.
Alkanes have functional groups bonded to carbon atoms.
c.
Alkanes have triple bonds between carbons and so can only bond with one hydrogen atom each.
d.
Each of the carbon atoms must bond to the other carbon atom as well as to hydrogen atoms.
Hint
