Molecular Compounds

Molecular Compounds

• Molecular Compounds form between nonmetals and nonmetals. (ex. S2O4 )

• Covalent bonds form when atoms share electrons.

• Neither atoms gain or lose electrons because their electronegativity values are very close.

Naming Binary Molecular Compounds

• To name molecular compounds, use prefixes to show how many atoms of each element there are.

• Exception: do not show a prefix if the first element has only one atom.

• Note: Do NOT reduce if the element ratio is not in lowest terms.

• Similar to ionic compounds – last element ends in -ide

Prefix # atomsmono 1di 2tri 3tetra 4penta 5hexa 6hepta 7octa 8nona 9deca 10

Name the following molecular (covalent) compound: SiF4

Monosil

icon fl...

Sulfu

r fluorid

...

Monosil

icon te

...

Silic

on tetra

f...

Silic

on quadfl...

0% 0% 0%0%0%

1. Monosilicon fluoride2. Sulfur fluoride3. Monosilicon

tetrafluoride4. Silicon tetrafluoride5. Silicon quadfluoride

Name the following molecular (covalent) compound: SO3

Sulfu

r trio

xid...

Sulfu

r oxide

Sulfu

r dioxid

e

Monosu

lfur t

ri...

0% 0%0%0%

1. Sulfur trioxide2. Sulfur oxide3. Sulfur dioxide4. Monosulfur trioxide

Name the following molecular (covalent) compound: S2F6

Sulfu

r fluorid

...

Sulfu

r hexaflu...

Disu

lfur fl

uor...

Disu

lfur h

exaf..

.

0% 0%0%0%

1. Sulfur fluoride2. Sulfur hexafluoride3. Disulfur fluoride4. Disulfur

hexafluoride

Acid Nomenclature

• In general, names of acids will begin with hydrogen.

• If the anion does not contain oxygen, the acid begins with hydro and ends in –ic

• HCl = hydrochloric acid• HBr = • HCN =

Acids containing oxygen

• If the acid contains oxygen, the acid does not have hydro at the start and either ends in ic or ous.

• If the anion ends in –ate use –ic• HNO3 = nitric acid• If the anion ends in –ite use –ous• H2SO3 = sulfurous acid