Naming Compounds

Ionic Compound Formed with a metal and nonmetal Rules for naming: Write the name of the positively charged ion first. (Usually a metal) Write the name of the negatively charged ion second. (Usually a nonmetal) For the second ion, keep the base of the name and replace the ending with “ide”

Example of Ionic Compound NaCl = Sodium Chloride (chlorine becomes chloride) 2. KI = Potassium Iodide (Iodine becomes Iodide) 3. MgO = Magnesium Oxide (Oxygen become oxide)

Polyatomic Ion These are tightly bound groups of atoms that behave as a unit and carry a charge SEE LIST PROVIDED TO MEMORIZE NAME, FORMULA and CHARGE

Naming Compounds with Polyatomic Ions Write the name of the positively charged ion first. (May be the polyatomic ion) Write the name of the negatively charged ion second. (May be the polyatomic ion) If the second ion is not the polyatomic ion, keep the base name and add “ide”. Wherever the polyatomic ion is found, its name remains as learned.

Example of a compound containing a polyatomic ion NaNO3 = Sodium Nitrate NH4F = Ammonium Fluoride

Naming Acids Acids usually begin with hydrogen Hydrogen and a nonmetal Ex: HCl Hydrogen and a nonmetal Named hydro – (base name of element) – ic acid HCl Hydrochloric acid HF Hydrofluoric acid HBr Hydrobromic acid

Continuing Naming Acids If the acid contains a polyatomic ion then…. Polyatomic ions end in –ate Change to – “ic acid” Polyatomic ions that end in –ite Change to – “ous acid” EX: H2SO4 Sulfate Sulfuric acid H2SO3 Sulfite Sulfurous acid

Naming Bases Most bases end with hydroxide Name metal then add word “hydroxide” EX: NaOH Sodium Hydroxide