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Worksheet 25 - Oxidation/Reduction Reactions 0 II +1 +2 -2 -1

Worksheet 25 - Oxidation/Reduction Reactions Oxidation number rules: Elements have an oxidation number of 0 Group I and II In addition to the elemental oxidation state of 0, Group I has an oxidation state of +1 and Group II has an oxidation state of +2. Hydrogen usually +1, except when bonded to Group I or Group II, when it forms hydrides, -1. Oxygen usually -2, except when it forms a O-O single bond, a peroxide, when it is -1. Fluorine is always -1. Other halogens are usually -1, except when bonded to O. 1. Assign oxidation numbers to each of the atoms in the following compounds: Na2 CrO4 Na = +1 O = -2 Cr = +6 K2Cr2O7 K = +1 O = -2 Cr = +6 CO2 O = -2 C = +4 CH4 H = +1 C = -4 HClO4 O = -2 H = +1 Cl = +7 MnO2 O = -2 Mn = +4 SO32- O = -2 S = +4 SF4 F = -1 S

Bromine half-reaction Manganese half-reaction Br-→ Br 2 MnO 4-→ Mn2+ 6. First balance the bromine half-reaction first. a. Balance the bromine atoms of the reaction _2__ Br- → _1__Br 2 b. Now balance charge by adding electrons (e-) _2__ Br- → _1__Br 2 + 2e-This half-reaction is producing/consuming electrons. This is an oxidation ...

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