Download Lecture 2.10 - Writing Chemical Formulas

Writing Chemical Formulas
Writing Chemical Formulas
Prefix System
mono
= 1
di
= 2
tri
= 3
tetra
= 4
penta
= 5
hexa
= 6
hepta
= 7
octa
= 8
non
= 9
dec
= 10
dinitrogen trisulfide
N2S3
Writing Chemical Formulas
StockSystem
*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
+2
Cu
Writing Chemical Formulas
"ide endings"
Names ending with the letters "ide" are usually
elements with negative oxidation numbers.
oxide - O2-
Examples:
hydride - H1- sulfide - S2- chloride - Cl1-
Hydroxide - OH1-
Exceptions:
Peroxide - O22- Cyanide - CN1-
"ate" and "ite" endings
Names ending with the letters "ate" or "ite" are
polyatomic ions (see Reference Table E).
Writing Chemical Formulas
Ex. (1) aluminum chloride
+3
-1
AlCl3
Al 1 Cl 3
_______________
 _______________
Ex. (2) ammonium chloride
+1
-1
NH41 Cl 1
NH4Cl
_______________
 _______________
Ex. (3) iodine trichloride
tri
I Cl 3
ICl3
_______________
 _______________
Ex. (4) chlorine gas
Cl 2
Cl2
_______________
 _______________
Writing Chemical Formulas
Ex. (5) chloride
ide ion
-1
Cl
Cl1_______________
 _______________
Ex. (6) calcium hydroxide
+2
-1
Ca(OH)2
Ca 1 OH 2
_______________
 _______________
Ex. (7) copper II hydroxide
+2
-1
Cu(OH)2
Cu 1 OH 2
_______________
 _______________
Ex. (8) dinitrogen
pentoxide
di
pent
N2O5
_______________
N2 O 5
 _______________
Writing Chemical Formulas
Ex. (9) nitrogen V oxide
+5
-2
N2O5
N2 O 5
_______________
 _______________
Ex.(10) hydrogen sulfide
ide
+1
-2
H2S
H2 S 1
_______________
 _______________
Ex.(11) barium sulfate
+2
-2
BaSO4
Ba12 SO4 12
_______________
 _______________
Ex.(12) barium acetate
+2
-1
Ba 1 C2H3O2 2
_______________
Ba(C2H3O2)2
 _______________
Writing Chemical Formulas
Ex.(13) lead IV oxide
+4
-2
PbO2
Pb 12 O 24
_______________
 _______________
Ex.(14) potassium chlorate
+1
-1
K 1 ClO3 1
KClO3
_______________
 _______________
Ex.(15) lead II iodide
+2
-1
PbI2
Pb1 I 2
_______________
_______________
Ex.(16) lithium carbonate
+1
-2
Li 2 CO3 1
Li2CO3
_______________
 _______________
Writing Chemical Formulas
Ex.(17) zinc bromide
+2
-1
ZnBr2
Zn 1 Br 2
_______________
 _______________
Ex.(18) sodium peroxide
+1
-2
Na2O2
Na 2 O2 1
_______________
 _______________
Ex.(19) tin II nitrate
+2
-1
Sn(NO3)2
Sn1 NO3 2
_______________
_______________
Ex.(20) sodium thiosulfate
+1
-2
Na2S2O3
Na 2 S2O3 1
_______________
 _______________
Writing Chemical Formulas
Ex.(21) sulfur dioxide
di
SO2
S1 O2
_______________
 _______________
Ex.(22) nitrogen mon
monoxide
N1 O 1
NO
_______________
 _______________
Ex.(23) sodium carbonate
+1
-2
Na2CO3
Na2 CO3 1
_______________
_______________
Ex.(24) cobalt II chlorate
+2
-1
Co(ClO3)2
Co 1 ClO3 2
_______________
 _______________
Writing Chemical Formulas
Ex.(25) silver sulfide
+1
-2
Ag2S
Ag 2 S 1
_______________
 _______________
Ex.(26) sodium carbonate
+1
-2
Na2CO3
Na 2 CO3 1
_______________
 _______________
Ex.(27) nitrite ion
-1
NO21NO2
_______________
_______________
Ex.(28) nitrogen IV oxide
+4
-2
NO2
N 21 O 42
_______________
 _______________
Writing Chemical Formulas
Ex.(29) hydrogen peroxide
+1
-2
H2O2
H 2 O2 1
_______________
 _______________
Ex.(30) nickel II fluoride
+2
-1
NiF2
Ni 1 F 2
_______________
 _______________
Ex.(31) barium chloride
+2
-1
BaCl2
Ba1 Cl 2
_______________
_______________
Ex.(32) carbon di
disulfide
CS2
_______________
C1 S 2
 _______________
Writing Chemical Formulas
Ex.(33) ammonium nitrate
+1
-1
NH4NO3
NH4 1 NO3 1
_______________
 _______________
Ex.(34) sodium di
dichromate
chromate
+1
-2
Na2Cr2O7
Na 2 Cr2O7 1
_______________
 _______________
FIN!