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Redox Reactions

Redox Reactions. Nugent-Regents Chem. Oxidation Numbers:. Rule 1: All pure elements are assigned the oxidation number of zero. Rule 2: All monatomic (single element) ions are assigned oxidation numbers equal to their charges.

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Redox Reactions

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  1. Redox Reactions Nugent-Regents Chem

  2. Oxidation Numbers: • Rule 1: All pure elements are assigned the oxidation number of zero. • Rule 2: All monatomic (single element) ions are assigned oxidation numbers equal to their charges. • Rule 3: Certain elements usually possess a fixed oxidation number in compounds. • The oxidation number of O in most compounds is -2. • The oxidation number of halogens in many, but not all, binary compounds is -1 • The oxidation numbers of alkali metals (Group I) and alkaline earth metals (Group II) are +1 and +2, respectively. • Rule 4: The sum of all oxidation numbers in a compound equals zero, and the sum of oxidation numbers in a polyatomic ion equals the ion’s charge.

  3. Oxidation Numbers Practice: • All alone= 0: Pb = Pb0, O2= O20 • Given charge, Take Charge: Al+3 = +3 • Unless noted, sum charge =0 for ionic • AlCl3 = Al+3 and Cl-1

  4. Transition Metals • Assign the non-metal, the one that carries a negative charge, its usual anion charge. (O = -2, Br = -1, etc.) • Set the net charge of the compound to equal zero. • Calculate the oxidation number needed to balance the total charge. • Example #2: What is the oxidation number of Cu in Cu3N2? • The oxidation number of N is -3. • There are 2 N atoms: (2)(-3) = -6 • The net charge is 0. • There are 3 Cu atoms: (3)(?) = +6 • Therefore, the oxidation state of Cu is +2.

  5. Redox • Redox Reactions: Transfer of electrons • Reduction: Gain of Electrons • Oxidation: Loss of Electrons • LEO the Lion says GER • OIL RIG • Law of Conservation of Mass and Charge!

  6. Redox Animations • Zno + Cu+2 • Mgo + Cu+2 

  7. Assign ox #’s and balance CH4 + O2 CO2 + H2O ox: red: Mg + CoBr3  MgBr2 + Co ox: red:

  8. Self Check • Quiz 1 • Self Check 2 • Self Check 3

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