Polyvalent Binary Ionic Compounds Unit 6: Ch 7.1b & Ch 9.2b

Criss-Cross Method Determine the ions Criss Cross the charges of the ions = chemical formula Example: Calcium + Phosphorus

Criss-Cross Method Determine the ions Criss Cross the charges of the ions = chemical formula Example: Calcium + Phosphorus Ca + P IONS = Ca2+ + P3-

Criss-Cross Method Determine the ions Criss Cross the charges of the ions = chemical formula Example: Calcium + Phosphorus Ca + P IONS = Ca2+ + P3- Ca3P2

Polyvalent Metals Many but not all transition metals have “multiple personalities” # of valence electrons varies Polyvalent they can form more than one ion Roman Numerals are used to signify the charge

Transition Metals

Polyvalent Transition Metals Metals with more than one possible charge: Specific charge is indicated in parenthesis

Polyvalent Metals & Bonding Fe(II) = Iron (II) + oxygen =

Polyvalent Metals & Bonding Fe(II) = Fe2+ Iron (II) + oxygen =

Polyvalent Metals & Bonding Fe(II) = Fe2+ Iron (II) + oxygen = Fe2+ & O2-

Polyvalent Metals & Bonding Fe(II) = Fe2+ Iron (II) + oxygen = Fe2+ & O2-  Fe2O2  FeO

Polyvalent Metals & Bonding Fe(II) = Fe2+ Iron (II) + oxygen = Fe2+ & O2-  Fe2O2  FeO Fe(III) = Fe3+ Iron (III) + oxygen =

Polyvalent Metals & Bonding Fe(II) = Fe2+ Iron (II) + oxygen = Fe2+ & O2-  Fe2O2  FeO Fe(III) = Fe3+ Iron (III) + oxygen = Fe3+ & O2-

Polyvalent Metals & Bonding Fe(II) = Fe2+ Iron (II) + oxygen = Fe2+ & O2-  Fe2O2  FeO Fe(III) = Fe3+ Iron (III) + oxygen = Fe3+ & O2-  Fe2O3

Naming Polyvalent IOns Stock Name: Same as Simple Binary Ionic Plus metal’s oxidation #/charge (roman numeral) in parentheses Fe2+  Iron (II) ion Fe3+  Iron (III) ion

Naming Polyvalent Ions Classical Name: Uses root word (typically from Latin name) with different suffixes for different oxidation #’s/charges -ous  lower ionic charge -ic  higher ionic charge Example: Iron  Ferrum Fe2+  Ferrous ion Fe3+  Ferric ion Pg 255  List of classical names – Take down the roots of the listed metals!

Naming Polyvalent Binary Ionic Compounds Same as Simple Binary Ionic Compounds Combine the ion names FeO Stock Name: Iron (II) Oxide Classical Name: Ferrous Oxide Fe2O3 Stock Name: Iron (III) Oxide Classical Name: Ferric Oxide

Practice - Polyvalent Compounds Names to Formulas Silver (III) Nitride Silver (II) Nitride Vanadium (III) Chloride Vanadium (II) Chloride Lead (IV) Oxide Lead (II) Oxide

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) Fe2O3 

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) Fe2O3  Fe3+ and O2-

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) Fe2O3  Fe3+ and O2- Check the anion’s charge against the periodic table

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) Fe2O3  Fe3+ and O2- Check the anion’s charge against the periodic table O2- is correct  So Fe is a 3+

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) Fe2O3  Fe3+ and O2- Check the anion’s charge against the periodic table O2- is correct  So Fe is a 3+ Name  Iron (III) oxide or Ferric Oxide

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) FeO 

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) FeO  Fe1+ and O1-

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) FeO  Fe1+ and O1- Check the anion

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) FeO  Fe1+ and O1- Check the anion O1- is NOT correct  Been a reduction

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) FeO  Fe1+ and O1- Check the anion O1- is NOT correct  Been a reduction 1:1 ratio – metal started with the same charge as the anion.

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) SnO3 

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) SnO3  Sn3+ and O1-

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) SnO3  Sn3+ and O1- O2-

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) SnO3  Sn3+ and O1- O2- x 2

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) SnO3  Sn3+ and O1- Sn6+ O2- x 2

Practice - Polyvalent Compounds Formula to Name Have to determine the oxidation #/Charge of your metal. Reverse the criss cross (doesn’t always work) SnO3  Sn3+ and O1- Sn6+ O2- Name: Tin (VI) Oxide x 2