ox_redox - Unit X Oxidation-Reduction Reactions X.1...

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Unit X Oxidation-Reduction Reactions X.1 _ cell reactions see fig. X.1 Zn Zn 2+ (aq) + 2e - (oxidation; gains e - ) Cu 2+ (aq) + 2e - Cu (s) (reduced; loses e - ) X.2 Electron-Transfer Reactions Oxidation is defined as the loss of electrons The reaction is a half-reaction (because it cannot occur by itself) Reduction is a gain of electrons Ex: Zn (s) Zn 2+ (aq) + 2e - Cu 2+ ( aq) + 2e Cu (s) Zn (s) + Cu 2+ (aq) Cu (s) + Zn 2+ (aq) (net ionic equation) X.3 Oxidation Numbers Oxidation Number Rules 1. the oxidation number of any elemental substance is zero 2. the oxidation number of any monatomic is the same charge as the ion 3. the oxidation number of combined oxygen is –2 (except in peroxides [-1], superoxides [-1/2] and OF 2 [+2] 4. the oxidation number of combined hydrogen is +1 (except as a monatomic hydrate ion, H-) 5. in any molecular or ionic species, the sum of he oxidation numbers of all atoms in a formula is equal to the charge of the unit
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ox_redox - Unit X Oxidation-Reduction Reactions X.1...

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