Chpt 21-1 - Electrochemistry 21.1, 21.2 4.5 Oxidation...

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Unformatted text preview: Electrochemistry 21.1, 21.2 4.5 Oxidation Numbers • Oxidation numbers are decided by the molecule – Neutral molecule = add up to zero – Charged ion = add up to the charge • Some general rules – O is usually -2 – H is usually +1 (bond to metal is -1) – First two columns of metals follow the column number – Non-metals can vary (decide from everything else) For ionic compounds split up the ions: FeSO 4 consider Fe 2+ and SO 4 2- individually 21.1 Redox Recap • OIL RIG • Oxidation involves Loss – Losing electrons – Oxidation number of atom becomes more positive • Reduction involves Gain – Gaining electrons – Oxidation number of atom becomes negative • Balancing More Redox • Balance the following redox reaction NO 3 – + Fe NO + Fe 2 O 3 (acidic) • And this one BrO 3 – + Sb Br 2 + SbO + (basic) 21.1 Half-reaction method 1. Write two half-reactions (one oxidation, one reduction) 2. Balance all but H’s and O’s 3. Balance O’s by adding H 2 O...
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This note was uploaded on 02/05/2012 for the course CHEM 1212 taught by Professor Dockery during the Spring '08 term at Kennesaw.

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Chpt 21-1 - Electrochemistry 21.1, 21.2 4.5 Oxidation...

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