Chemistry notes

Chemistry notes - Oxidation/Reduction reactions (redox for...

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Oxidation/Reduction reactions (redox for short): a. O 2 may indicate a reduction reaction. a. Combustion reactions are an example. i. 2H 2 + O 2 -> 2H 2 O b. Reduction = GAINING electrons c. Generally loud, releasing energy b. Electron bookkeeping: a. Oxidation states are not charges! b. Free elements have an oxidation state of 0. c. Monoatomic ions have an oxidation state equal to their charge, e.g. Na = +1 and Cl = -1 in NaCl d. The sum of the oxidation states of all atoms in a compound is 0. e. The sum of the oxidation states of all atoms in a polyatomic ion equals the charge of the ion. f. Group I metals have an oxidation state of +1 in all their compounds g. Group II metals have an oxidation state of +2 in all their compounds h. FOCUS ON THIS ONE: In their compounds, nonmentals have oxidation states according to the table below; nonmentals higher on the table take priority: i. F = -1 ii. H = +1 iii. O = -2 iv. Group 7A = -1 v. Group 6A = -2 vi. Group 5A = -3 vii. E.g. H 2 O 2 : Hydrogen will be +1 because it’s higher on the list. With the 2
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This note was uploaded on 05/06/2011 for the course CHEM 111 taught by Professor Lemaster during the Spring '08 term at Boise State.

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Chemistry notes - Oxidation/Reduction reactions (redox for...

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