Name: …………………… (
Chem!stry
)
Class: ………………
Date: …… / …… / ……
Chemical Formulae – Answers
 Using your valency table, complete the formulae of the compounds that are formed through
combinations of the following cations (positively charged ions) and anions (negatively charged
ions). Note: The charge on an ion represents the valency of the ion and should not be included
when writing the final formula of the compound, e.g. sodium chloride is written as NaCl and not
as Na+Cl–.
Anions
Cations
Cl–
Br–
I–
OH–
NO3–
O2–
CO32–
SO42–
PO43–
Na+
NaCl
NaBr
NaI
NaOH
NaNO3
Na2O
Na2CO3
Na2SO4
Na3PO4
K+
KCl
KBr
KI
KOH
KNO3
K2O
K2CO3
K2SO4
K3PO4
NH4+
NH4Cl
NH4Br
NH4I
NH4OH
NH4NO3 (NH4)2O
(NH4)2CO3 (NH4)2SO4 (NH4)3PO4
Ag+
AgCl
AgBr
AgI
AgOH
AgNO3
Ag2O
Ag2CO3
Ag2SO4
Ag3PO4
Ca2+
CaCl2
CaBr2
CaI2
Ca(OH)2
Ca(NO3)2
CaO
CaCO3
CaSO4
Ca3(PO4)2
Mg2+
MgCl2
MgBr2
MgI2
Mg(OH)2
Mg(NO3)2
MgO
MgCO3
MgSO4
Mg3(PO4)2
Fe2+
FeCl2
FeBr2
FeI2
Fe(OH)2
Fe(NO3)2
FeO
FeCO3
FeSO4
Fe3(PO4)2
Cu2+
CuCl2
CuBr2
CuI2
Cu(OH)2
Cu(NO3)2
CuO
CuCO3
CuSO4
Cu3(PO4)2
Pb2+
PbCl2
PbBr2
PbI2
Pb(OH)2
Pb(NO3)2
PbO
PbCO3
PbSO4
Pb3(PO4)2
Fe3+
FeCl3
FeBr3
FeI3
Fe(OH)3
Fe(NO3)3
Fe2O3
Fe2(CO3)3
Fe2(SO4)3
FePO4
Al3+
AlCl3
AlBr3
AlI3
Al(OH)3
Al(NO3)3
Al2O3
Al2(CO3)3
Al2(SO4)3
AlPO4
1
Name: …………………… (
Chem!stry
Class: ………………
Date: …… / …… / ……
Writing Chemical Formulae – Answers
a)
sodium chloride
NaCl
b)
sodium oxide
Na2O
c)
potassium bromide
KBr
d)
magnesium chloride
MgCl2
e)
magnesium oxide
MgO
f)
aluminium chloride
AlCl3
g)
aluminium oxide
Al2O3
h)
copper(II) oxide
CuO
i)
iron(III) chloride
FeCl3
j)
potassium nitrate
KNO3
k)
calcium nitrate
Ca(NO3)2
l)
sodium carbonate
Na2CO3
m)
magnesium carbonate MgCO3
n)
copper(II) sulfate
CuSO4
o)
copper(II) nitrate
Cu(NO3)2
p)
silver nitrate
AgNO3
q)
lead(II) bromide
PbBr2
r)
lead(II) nitrate
Pb(NO3)2
s)
ammonium chloride
NH4Cl
t)
ammonium nitrate
NH4NO3
u)
ammonium sulfate
(NH4)2SO4
v)
silver oxide
Ag2O
w)
zinc sulfate
ZnSO4
x)
zinc nitrate
Zn(NO3)2
y)
nitric acid
HNO3
z)
sulfuric acid
H2SO4
2
)