Lec-30-Chap5-2

Lec-30-Chap5-2 - Oxidation-Reduction Reactions Oxidation...

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Oxidation-Reduction Reactions Oxidation Oxidation Originally: add oxygen . 2 Cu(s) + O 2 (g) 2 CuO(s) 2 CO(g) + O 2 (g) 2 CO 2 (g) Cu and CO are oxidized. O 2 is the oxidizing agent for both. Reduction Reduction Originally: reduce ore to metal ; reverse of oxidation . CuO(s) + H 2 (g) Cu(s) + H 2 O SnO 2 (s) + 2 C(s) Sn(s) + 2 CO(g) CuO and SnO 2 are reduced. H 2 and C are the reducing agents (note: H 2 is oxidized, so CuO is an oxidizing agent) Oxidation-Reduction Reactions In all cases: If something is oxidized, something must be reduced. • Redox reactions move e - . 2 Ag + (aq) + Cu(s) 2 Ag(s) + Cu 2+ (aq) • Ox Ox idation-red red uction = redox redox . Here: • Cu changes to Cu 2+ . • Cu loses 2 e - ; each Ag + gains one e - •A g + is reduced (ore turned to metal) Gain of e - = reduction (so, loss of e - = oxidation) +2 e - -2 e -
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Loss of electrons is oxidation Gain of electrons is reduction Leo Leo says ger ger Oxidation is loss Reduction is gain Redox Reactions and Electron Transfer Oil rig M is a reducing agent X is an oxidizing agent MX e - M loses electron(s) X gains electron(s) M is oxidized X is reduced Redox Reactions and Electron Transfer
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Oxidizing Agent Reaction Product O 2 (oxygen)
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Lec-30-Chap5-2 - Oxidation-Reduction Reactions Oxidation...

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