CHAPER 5 HANDOUT HW (Chem 110)
NOMENCLATURE
1.) Provide the correct chemical name or formula for each of the following compounds. Try not to look at a
periodic table!
a. Na2S
sodium sulfide
m.
MgCl2
magnesium chloride
b. Cu2O
copper(I) oxide
n.
FeI3
iron(III) iodide
c.
chromium(III) bromide
o.
Al(OH)3
aluminum hydroxide
d. Ba(OH)2
barium hydroxide
p.
CCl4
carbon tetrachloride
e. (NH4)2CO3
ammonium carbonate
q.
Ag2SO4
silver sulfate
f.
dichlorine monoxide
r.
PbF4
lead(IV) fluoride
g. Sn(OH)2
tin(II) hydroxide
s.
NO
nitrogen monoxide
h. P2O3
diphosphours trioxide
t.
HF
hydrofluoric acid
i.
HNO3
nitric acid
u.
N 2O 4
dinitrogen tetroxide
j.
Ca3N2
calcium nitride
v.
H3PO4
phosphoric acid
k.
Fe3(PO4)2
iron(II) phosphate
w.
SO2
sulfur dioxide
l.
HBr
hydrobromic acid
x.
Zn(NO3)2
zinc nitrate
CrBr3
Cl2O
2.) Why do we include prefixes in the name for substances like carbon monoxide, but not for substances
like lithium oxide?
Carbon monoxide consists of nonmetals, so is a molecular compound. You can form many different
molecules by combining the nonmetals in different ratios, so you need prefixes to make it clear how
many of each atom there are. Lithium oxide consists of a metal and nonmetal, so is an ionic
compound. Lithium only makes one type of ion (Li+), so you can always figure out how many of each
ion there is because the net charge on a formula is always zero.
1 3.) Dichromate (Cr2O7) is a polyatomic ion, although not one you should have memorized. Knowing that
sodium dichromate is Na2Cr2O7, what is the formula of aluminum dichromate?
If Na2Cr2O7 is the right formula for sodium dichromate, then Cr2O7 must have a negative 2 charge.
Na+ Na+ Cr2O72−
This means that aluminum dichromate must be Al2(Cr2O7)3
Al3+ Al3+ Cr2O72−
Cr2O72−
Cr2O72−
2