092208 - Oxidation-Reduction Reactions Redox a shorter way...

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Oxidation-Reduction Reactions y Redox – a shorter way of saying oxidation-reduction reaction y Oxidation – loss of electrons y Reduction – gain of electrons y Oxidizing Agent – what is being reduced y Reducing Agent – what is being oxidized
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Oxidation Number y Oxidation Number – the “charge” on the element as if it were an ion dissolved in water
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Oxidation-Reduction Reactions y What are the oxidation states on all the elements in the following? y O 2 y Mg 2 P 2 O 7 y Hg 2 Cl 2 y Na 2 S 2 O 3
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What is the oxidation state of uranium in UO 2 2+ ? 3 4 5 6 4% 79% 1% 17% 1. +3 2. +4 3. +5 4. +6
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Oxidation-Reduction Reactions y Half-Reaction Method 1. Identify atoms that are gaining and losing electrons 2. Separate into two equations, if the element being oxidized or reduced is bound to other things in the full reaction you need to include these 3. Balance all atoms except for H and O 4. Balance O by adding H 2 O, balance H by adding H + 5. Balance charge with electrons 6. Add the two equations to cancel electrons 7. Cancel things that are the same on both sides
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This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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092208 - Oxidation-Reduction Reactions Redox a shorter way...

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