IONIC NOMENCLATURE Writing Names and Formulas

NAMING COMPOUNDS AND FORMULAS - NOMENCLATURE Three Goals: Interpret information given by a chemical formula. Write formulas for various compounds. Name compounds given a formula.

NAMING COMPOUNDS AND FORMULAS - NOMENCLATURE A chemical formula tells: what type of atoms are present. the number of each type of atom present. ratio of one atom to another. H2O Cl2 Al2O3

NAMING COMPOUNDS AND FORMULAS - NOMENCLATURE Before naming a compound, you must determine which category it fits into: Ionic OR Molecular (Covalent)

IONIC NOMENCLATURE NaCl, sodium chloride contains cations and anions. Includes metals and nonmetals. Metals go first in name and formula. NaCl, sodium chloride

IONIC NOMENCLATURE Which symbol goes first? S and Cu d. C and Mg P and Bi e. Ca and Cl c. N and Fe f. Al and Br

NAMING IONIC COMPOUNDS Write the name of the cation (metal) Write the name of the anion and change the ending to “ide”.

PRACTICE CaF2 CaCl2 MgBr2 BeO BeS B2S3 NaF K2O

POLYATOMIC IONS An ion made up of more than one atom NO3-1, SO4-2, C2H3O2-1; The charges given to polyatomic ions apply to the whole group of atoms in the ion. NEVER change the subscripts of a polyatomic ion. If more than one ion is needed, a parenthesis is placed around the ion and the subscript is written outside; Example: Al(OH)3

POLYATOMIC IONS Acetate, C2H3O2-1 Ammonium, NH4+1 Bicarbonate, HCO3-1 Ones You Might Run Into: Acetate, C2H3O2-1 Ammonium, NH4+1 Bicarbonate, HCO3-1 Carbonate, CO3-2 Hydroxide, OH-1 Nitrate, NO3-1 Phosphate, PO4-3 Sulfate, SO4-2

PRACTICE Ca(OH)2 Na2SO4 KC2H3O2 NH4NO3 Mg(HCO3)2 Al2(CO3)3 Al(NO3)3 AlPO4