Chemical Bonding Ionic Compounds.

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Presentation transcript:

Chemical Bonding Ionic Compounds

B. Lewis Structures What do Lewis Dot Diagrams represent: show the transfer of valence e-

Things to know about Ionic Ionic compounds are made up of? Metal (cation) and Nonmetal (anion) The electrons are being? Transferred What is written first? Metal (cation) Opposite charges will? Attract

How to write a formula S.O.X.S Ionic Formulas Overall net charge must equal zero. S.O.X.S Symbols -> Oxidation # -> Crisscross -> Simplify Don’t show charges in the final formula.

Writing Formula Practice Potassium Chloride K+ Cl-  KCl Aluminum Bromide Al+3 Br-  AlBr3 Beryllium Sulfide Be+2 S-2  BeS = Reduce

Let’s Practice Ionic Formulas… Examples… Back of sheet HW! On to writing Ionic NAMES…

How to Name an Ionic Compound Ionic Nomenclature How to Name an Ionic Compound Write the name of the Cation (Metal) first. It comes straight off the periodic table. Change ending of the Anion (Nonmetal) to end in -ide.

List of –ides…

Naming Practice Al2O3 Aluminum Oxide CaS Calcium Sulfide Na3P Sodium Phosphide

Let’s practice Ionic names… Dice or Speed Dating Back of Practice sheet=HW

Writing with Transitions When a Transition metal is involved in the bond, you must identify which form of the atom is bonding. These atoms can have different oxidation numbers. Look for the Roman Numeral in the name when writing the formula. *The Roman numeral is the oxidation number of the transition metal!

Do you know your Roman Numerals???

Practice Writing Transitions Copper (II) Fluoride CuF2 Zinc (I) Phosphide Zn3P Nickel (IV) Oxide NiO2 (Simplified formula)

Naming Transitions REVERSE CRISS-CROSS!!!! *(Just check the anion charge to see if the formula was reduced)

Au2S *stop and label!! Gold(I) Sulfide Co2O3 Copper(III) Oxide FeN Practice Naming T.M.s Au2S *stop and label!! Gold(I) Sulfide Co2O3 Copper(III) Oxide FeN Iron(III) Nitride

TM exceptions (Al+3) Zn always +2 Ag always +1

Polyatomic Ions When you have a compound that involves more than 2 elements, you must look at a Polyatomic Chart for help(back of your PT). When writing formulas, keep these ions in parentheses. These ions will also have different endings (-ate) (-ite) Helpful for determining between individual atoms and polyatomic ions

Writing a Formula You need to determine if a Polyatomic Ion is present! Look at the ending of the name (-ATE) or (-ITE) What are some exceptions??? What if the ending is (-IDE)? What will you do then?

Writing Polyatomics KNO3 Aluminum Sulfide Al2S3 Barium Phosphite Potassium Nitrate KNO3 Aluminum Sulfide Al2S3 Barium Phosphite Ba3(PO3)2

Naming Polyatomics Look for more than two elements. That’s means a Polyatomic is present. Match up the polyatomics and write the correct names and ending straight from the chart.

Practice w/ Polyatomics CaSO4 Calcium Sulfate Ga(IO3)3 Gallium Iodate