Lacey_Che131_S2012_Lect-11s

Lacey_Che131_S2012_Lect-11s - Redox reactions AAA Cell C...

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d Lec-11: Redox reactions; Titrations Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Redox reactions AAA Cell AA Cell C Cell D Cell 9 Volt Capacity 1100mAh 2500mAh 7100mAh 14,300mAh600mAh Energy 1.4 Wh 3 Wh 9 Wh 18 Wh 4.2 Wh Cost per Cell $1.25 $1.00 $1.60 $1.60 $3.10 Cost per $890 $330 $180 $90 $730 KWh Electric power 0 5 Electric power 0 5 10 c / KWh 10 c / KWh Electric power 0.5 Electric power 0.5-10 c / KWh Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 Redox reactions Red uction Ox idation Reactions: ( RedOx ) Reactions involving the transfer of electrons from one species to another species to another. M X O id ti R d ti Æ Energy production e - Oxidation Reduction Lose e - Gain e - X - M + Oxidation State Reduction State Increases Increases Reducing Agent Oxidizing Agent A given species is said to be “reduced” when it i l t d “ idi d” h it l Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 M X it gains electrons and “oxidized” when it loses electrons Redox reactions A given species is said to be “reduced” when it gains electrons and “oxidized” when it loses electrons Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4
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Assigning oxidation states 1. The oxidation number of elements in a neutral molecule sum to zero or sum to charge of the ion in an ion in an ion. 2. Oxidation state of an atom in an element = 0.
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