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