Day 9 Ionic Compounds with Polyatomic Ions SCI 10 Chemistry

Polyatomic ions Polyatomic ion: an ion made up of 2 or more different atoms The charge belongs to the entire ion There are covalent (non-ionic) bonds between the atoms Names often end in “ate” or “ite” instead of “ide” Check out the back of your periodic table! http://www.youtube.com/watch?v=MJZeZvDxcx8

Naming ionic compounds with polyatomic ions FORMULA TO NaMe: Write the name of the metal (the cation) Write the name of the polyatomic ion Ex: NaNO3 = sodium nitrate

Try It! Name: AlBO3 Aluminum borate KClO3 Potassium chlorate

Transition metal + polyatomic ions Don’t forget that when there is a transition metal you must indicate its charge with brackets & Roman numerals To find the charge of the transition metal, draw it out! Ex: Fe(OH)3 This is iron (III) hydroxide

Transition metal + polyatomic ion Ex: CuSO4 Copper (II) sulfate

Naming ionic compounds with polyatomic ions NaMe to FORMULa: Formulas are written as before except: The polyatomic ion has to be placed inside brackets and the subscript written on the outside if you need more than one Ex: Magnesium hydroxide Ma(OH)2

Examples Iron (II) sulfate Magnesium nitrate Fe SO4 2+ 2- 2+ 2- Charges cancel (add to zero) so just rewrite the symbols: FeSO4 Magnesium nitrate Mg NO3 2+ 1- Mg(NO3)2

Try it! Find the name for: CuCO3 (NH4)2SO4 copper (II) carbonate ammonium sulfate

Try it! Find the formula for: Ammonium sulfide lead (II) nitrate NH4 S 1+ 2- (NH4)2S lead (II) nitrate Pb NO3 2+ 1- Pb(NO3)2

Practice Write the formula: sodium hydroxide magnesium phosphate lead (IV) hydroxide aluminum sulfate Write the name: (NH4)2O Na2SO4 Ca(OH)2 Ca(CO3) Pb(CO3)

To do: Day 9 Practice Ionic Compounds with Polyatomic Ions