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Writing Chemical Formulas
Writing Chemical Formulas
Prefix Systemmono= 1di = 2tri = 3 tetra = 4penta= 5hexa = 6hepta= 7 octa = 8 non = 9dec = 10
dinitrogen trisulfide
N2S3
Writing Chemical Formulas
Stock System*The Roman numeral is equal to the positive oxidation number of the
element before it.
*Roman numerals are only used with
elements that have more than one possible
positive oxidation number.
copper II sulfide
Cu+2
Writing Chemical Formulas
"ide endings"Names ending with the letters "ide" are usually
elements with negative oxidation numbers.
Examples:oxide - O2- hydride - H1- sulfide - S2- chloride - Cl1-
Exceptions:Hydroxide - OH1- Peroxide - O2
2- Cyanide - CN1-
"ate" and "ite" endingsNames ending with the letters "ate" or "ite" are
polyatomic ions (see Reference Table E).
Writing Chemical Formulas
Ex. (1) aluminum chloride
_______________ _______________
Ex. (2) ammonium chloride
_______________ _______________
Ex. (3) iodine trichloride
_______________ _______________
Ex. (4) chlorine gas
_______________ _______________
Al Cl+3 -1
31 AlCl3
NH4 Cl+1 -1
NH4Cl
I Cl
tri
3 ICl3
Cl 2 Cl2
11
Writing Chemical Formulas
Ex. (5) chloride ion
_______________ _______________
Ex. (6) calcium hydroxide
_______________ _______________
Ex. (7) copper II hydroxide
_______________ _______________
Ex. (8) dinitrogen pentoxide
_______________ _______________
Cl
ide ion
Cl1-
Ca OH
-1
+2 -1
21 Ca(OH)2
Cu OH+2 -1
II
21 Cu(OH)2
di pent
N O2 5 N2O5
Writing Chemical Formulas
Ex. (9) nitrogen V oxide
_______________ _______________
Ex.(10) hydrogen sulfide
_______________ _______________
Ex.(11) barium sulfate
_______________ _______________
Ex.(12) barium acetate
_______________ _______________
N O
V+5 -2
52 N2O5
H S+1
ide-2
12 H2S
Ba SO4
+2 -2
BaSO4
Ba C2H3O2
+2 -1
21 Ba(C2H3O2)2
22 11
Writing Chemical Formulas
Ex.(13) lead IV oxide
_______________ _______________
Ex.(14) potassium chlorate
_______________ _______________
Ex.(15) lead II iodide
_______________ _______________
Ex.(16) lithium carbonate
_______________ _______________
Pb O
IV+4 -2
42 21 PbO2
K ClO3
+1 -1
11 KClO3
Pb I
II+2 -1
21 PbI2
Li CO3
+1 -2
12 Li2CO3
Ex.(17) zinc bromide
_______________ _______________
Ex.(18) sodium peroxide
_______________ _______________
Ex.(19) tin II nitrate
_______________ _______________
Ex.(20) sodium thiosulfate
_______________ _______________
NO3
-2
O2
Writing Chemical Formulas
Zn Br+2 -1
21 ZnBr2
1 Na2O2Na+1
2
Sn
II+2 -1
21 Sn(NO3)2
S2O3Na+1 -2
12 Na2S2O3
Writing Chemical Formulas
Ex.(21) sulfur dioxide
_______________ _______________
Ex.(22) nitrogen monoxide
_______________ _______________
Ex.(23) sodium carbonate
_______________ _______________
Ex.(24) cobalt II chlorate
_______________ _______________
S O
di
1 2 SO2
mon
N O1 1 NO
CO3Na+1 -2
12 Na2CO3
ClO3Co+2 -1
II
21 Co(ClO3)2
Writing Chemical Formulas
Ex.(25) silver sulfide
_______________ _______________
Ex.(26) sodium carbonate
_______________ _______________
Ex.(27) nitrite ion
_______________ _______________
Ex.(28) nitrogen IV oxide
_______________ _______________
Ag S+1 -2
12 Ag2S
-2
CO3Na+1
12 Na2CO3
ion
NO2 NO21-
-1
IV
N O NO2
+4 -2
42 21
Writing Chemical Formulas
Ex.(29) hydrogen peroxide
_______________ _______________
Ex.(30) nickel II fluoride
_______________ _______________
Ex.(31) barium chloride
_______________ _______________
Ex.(32) carbon disulfide
_______________ _______________
H O2
+1 -2
12 H2O2
-1
FNi+2
II
1 2 NiF2
Ba Cl+2 -1
21 BaCl2
di
C S1 2 CS2
Writing Chemical Formulas
Ex.(33) ammonium nitrate
_______________ _______________
Ex.(34) sodium dichromate
_______________ _______________
FIN!
NH4 NO3
+1 -1
11 NH4NO3
Cr2O7Na+1 -2
12 Na2Cr2O7
chromatedi