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

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Electrochemistry 21.1, 21.2
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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
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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
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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)
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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 4. Balance H’s by adding H + 5.
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