Ch U6b HO Name

(Keep as notes) Naming Chemical Cmpds Pd.

1. Ionic Compounds. -- this has already been discussed in great detail. Basically, you simply name the two ions involved. If the cation involved has more than one possible charge, you must indicate the oxidation # in the name by using the roman numeral Stock naming system, or the classical system with the latin name and ending.

2. Hydrates. ---Some ionic compounds will absorb water from the air to form loose bonds with the compound. These hydrates have different properties than the anhydous (without water) form.

Writing formulas: you simply put the formula of the ionic compound followed by a "" and xH2O. "x" being the number of water molecules that bond per formula unit.

Naming hydrates: write the name of the ionic compound as normal, then add the correct numerical prefix in front of the word "hydrate" to indicate the number of water molecules bonded per formula unit.

anhydrous compound formula of hydrate hydrate name
CuSO4 CuSO4 5H2O copper(II) sulfate pentahydrate
BaCl2 BaCl2 2H2O barium chloride dihydrate
calcium chloride dihydrate
Li2SO4 H2O
sodium sulfide nonahydrate
Ni(NO 3) 2 6H2O

Numerical Prefixes
1 6
2 7
3 8
4 9
5 10

3. Binary Molecular compounds -- these are compounds consisting of two elements covalently bonded together. (ex SO2, CO, NH3) The name consists of two words that reflect the elemts involved and the number of atoms.

First Word: numerical prefix + name of element * NOTE: for the first word, if only one atom is present DO NOT Use Prefix (see CO2 below)

Second Word: numerical prefix + name of element with "ide" ending.

Molecular Formula Name of Compound
N2O dinitrogen monoxide
CO2 carbon dioxide
dinitrogen tetrahydride
diarsenic pentasulfide
dihydrogen monoxide