Use I.U.P.A.C., -ous/-ic, or Greek prefix method Naming Binary compounds when the first element has more than one valence. Use I.U.P.A.C., -ous/-ic, or Greek prefix method

I.U.P.A.C. Method (Stock method) Valence of the first element Name Hg2O O -> -2 Hg -> +1 Mercury (I) oxide HgO Hg -> +2 Mercury (II) oxide FeCl3 Cl -> -1 Fe -> +3 Iron (III) chloride

The valence of the first element is indicated by a Roman numeral in brackets following the name of the element.

Write the formula for: Antimony (III) chloride Arsenic (V) sulphide Sb3+ Cl – SbCl3 Arsenic (V) sulphide As5+ S2– As2S5

-ous/-ic Method 1. Use –ous ending if first element has a lower valence 2. Use –ic ending if first element has a higher valence

Name the following Example 1: MnO Mn -> +2 O -> -2 Mn can be +2 or +4 - manganous oxide

Example 2: MnO2 Manganic oxide Example 3: N2O3 Mn -> +4 O -> -2 N can be +3 or +5 Nitrous oxide

In this method, the following elements are named in Latin: Copper cuprous (+1) cupric (+2) Iron ferrous (+2) ferric (+3) Tin stannous (+2) stannic(+4) Lead plumbous (+2) plumbic(+4)

Name the following: Ferrous chloride Cupric oxide FeCl2 CuO

Write the formula for: Example 1: mercuric oxide HgO the higher valence for mercury is +2, oxygen is –2 HgO Example 2: ferrous oxide The lower valence for iron is +2, sulphur is –2 FeS

Greek Prefix:Use a greek prefix to indicate how many atoms are in the compound MONO DI TRI TETRA PENTA HEXA HEPTA OCTA NONA DECA

Name the following: Example 1: SO2 monosulphur dioxide -> sulphur dioxide Example 2: Al2O3 dialuminum trioxide Example 3: H2O dihydrogen monoxide

Write the formula for: Example 1: dinitrogen difluoride N2F2 Example 2: diphosphorus pentoxide P2O5 Example 3: carbon monoxide CO

Homework: 1. Complete handout page 4 from booklet 2. Page 103 #21 a, b, e, f 3. Page 105 #24 4. Page 106 #2 5. Page 108 #19 a, b, c, e, f