Oxidation States and Ionic Bonding Concepts
Explore the concepts of oxidation states and ionic bonding through the Criss-Cross Method. Learn how to identify if a compound is ionic, covalent, or metallic by analyzing its components. Discover the rules for assigning oxidation states and practice using the criss-cross method to write chemical formulas.
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Presentation Transcript
Topic: Oxidation States and Criss Cross Method Do Now: Ionic, Covalent or Metallic 1. Mg 2. MgO 3. NaCl 4. CO2 5. H2O 1.Metallic 2.Ionic 3.Ionic 4.Covalent 5.Covalent
Ionic bond is a bond between: positive ion and negative ion Metals: lose valence electrons form cation (+ ion) Nonmetals: gain electrons form anion (- ion)
Metals lose their valence electrons and nonmetals gain
IONIC BONDING Ionic compounds are electrically neutral overall 1 Ca = +2 x 1 = +2 2 Cl = -1 x 2 = -2 2 K = +1 x 2 = +2 1 S = -2 x 1 = -2 2 Cr = +3 x 2 = +6 3 O = -2 x 3 = -6
Assigning Oxidation States You can look at your periodic table. It s listed in the topic right corner. What do you do if there is more then one?!
What to do if more then 1 oxidation state V2S5 Nonmetal = top number So S would be -2 -2 +5 V2S5 -2 x 5 = -10 Then determine the oxidation state of the metal that will give you the same number but positive ____ x 2 = +10 +5
You try FeO Fe=____ O= ____ +2 -2 -2 Fe2O3 Fe=____ O= ____ +3
Criss-Cross Method Mg+2 and Cl-1 Crisscross and Drop Mg1Cl2 but if subscript is 1, forget it! MgCl2 means 1 Mg+2 and 2 Cl-1
NOTE: The formula has to be in the simplest whole number ratio (this is called the empirical formular Be2O2 = BeO Al3N3 = AlN
Try a few formulas: Ca+2 + Cl-1 Na+1 + O-2 Cs+1 + S-2 Al+3 + Cl-1 Al+3 + Se-2 Mg+2 + F-1 Ca+2 + S-2 CaCl2 Na2O Cs2S AlCl3 Al2Se3 MgF2 CaS
