14.Oxidation_reduction_Part_4

14.Oxidation_reduction_Part_4 - Chapter 14:Oxidation...

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Chapter 14: Oxidation reduction reactions Part 4 Skip section 14.5 (balancing complex redox reactions) A Bonus Quiz will be released today: Tuesday March 22, at 5:00 pm Quiz 3 on redox: Tuesday March 29, before the lecture For help with homework problems, attend the scheduled recitations for the course -----
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Review: redox reactions An oxidation-reduction reaction is a reaction where electrons are transferred from one reactant (electron donor) to another (electron acceptor) • Example: Pb + Br 2 -> PbBr 2 A substance is oxidized when its oxidation number increases o i.e. Pb Pb 2+ + 2e - ; the charge on Pb changes from zero to 2+ A substance is reduced when its oxidation number decreases o i.e. Br 2 + 2e - 2Br - ; the charge on Br changes from zero to 1– Oxidation-reduction are coupled: cannot have oxidation without reduction
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Review: rules for assigning oxidation numbers Learn to apply the rules to determine whether a reaction is a Redox reaction The oxidation number of atoms in an uncombined (unreacted) element is 0 The sum of oxidation number of all atoms in a compound must equal to the total charge of the compound the same holds true for monoatomic ions In compounds, Hydrogen has an oxidation number of 1+ except when H is combined with metals In compound, the oxidation number of oxygen is 2- peroxide (1-) is an exception Use the position of the elements in the periodic table, to determine oxidation state of metals in compounds ------------
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Learn to use the knowledge gained in 11100 and in previous chapters in 11200 to solve redox problems Will cover two examples ----
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From the ionization equation of sulfuric acid H 2 SO 4 -> 2 H + + SO 4 2- we can deduce that the oxidation state of the SO 4 part in H 2 SO 4 should be 2- We can use this knowledge to determine the oxidation state of metals in salts derived from reactions with H 2 SO 4 Problem: determine the oxidation state of Pb in PbSO 4 Solution: oxidation state of PbSO 4 is zero, from redox rules (total charge of the compound) Let x be the oxidation of Pb in PbSO
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14.Oxidation_reduction_Part_4 - Chapter 14:Oxidation...

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