Naming Compounds That Contain Polyatomic Ions Worksheet Page 4
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Example 4.8
Summary of Naming Binary Compounds and
Compounds That Contain Polyatomic Ions
Name the following compounds.
a. Na
CO
d. PCl
e. CuSO
2
3
3
4
b. FeBr
c. CsClO
3
4
Solution
Compound
Name
Comments
2
a. Na
CO
sodium carbonate
Contains 2Na and CO
.
2
3
3
3
b. FeBr
iron(III) bromide
Contains Fe
and 3Br .
3
c. CsClO
cesium perchlorate
Contains Cs and ClO
.
4
4
d. PCl
phosphorus trichloride
Type III binary compound
3
(both P and Cl are non-
metals).
2
2
e. CuSO
copper(II) sulfate
Contains Cu
and SO
.
4
4
Self-Check Exercise 4.7
Name the following compounds.
a. NaHCO
c. CsClO
e. NaBr
g. Zn
(PO
)
3
4
3
4
2
b. BaSO
d. BrF
f. KOCl
4
5
Connection to Biology
Talking Tadpoles
I
t is well known that animals communicate by re-
aquarium partitioned by a screen that allowed wa-
leasing chemicals that others of the same species
ter to flow but blocked communications by sight and
receive and “understand.” For example, ants use
sound. When a wooden heron (a bird that preys on
chemicals to signal news about food supplies and
tadpoles) threatened the tadpoles in the one com-
danger from predators, and honeybees “recog-
partment, those on the other side moved away from
nize”
other
bees
the partition and ducked under a shelter. The re-
from the same hive
searchers concluded that the frightened tadpoles
by their chemical
signaled their fear to the tadpoles in other com-
signals. Now scien-
partment by releasing a chemical signal that flowed
tists at Yale Univer-
to the other side in the water.
sity have shown that
Other water-dwelling animals such as crayfish,
tadpoles send chem-
hermit crabs, and a fish called the Iowa darter also
ical signals to one
have been observed to send chemical danger sig-
another.
nals when they are threatened. Scientists think that
The experiment
the chemical used to send the signal is the ammo-
involved two groups
nium ion, NH
. Researchers are now trying to find
4
of tadpoles of red-
out whether all aquatic species have a common
A California red-legged
legged frogs. They
chemical “language” to signal one another, just as
frog tadpole.
were placed in an
ants and bees do.
103
4.4 Naming Compounds That Contain Polyatomic Ions
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