Reactions in Aqueous Solutions

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Reactions in Aqueous Solutions Chapter 4 Reactions in Aqueous Solutions

Oxidation-Reduction Reactions (electron transfer reactions) 2Mg 2Mg2+ + 4e- Oxidation half-reaction (lose e-) O2 + 4e- 2O2- Reduction half-reaction (gain e-) 2Mg + O2 + 4e- 2Mg2+ + 2O2- + 4e- 2Mg + O2 2MgO

The Oxidation Numbers of Elements in their Compounds

Types of Oxidation-Reduction Reactions 1. Combination Reactions A combination reaction is a reaction in which two or more substances combine to form a single product. A + B C +3 -1 2Al + 3Br2 2AlBr3

Types of Oxidation-Reduction Reactions 2. Decomposition Reactions Decomposition reactions are the opposite of combination reactions. A decomposition reaction is the breakdown of a compound into two or more components. C A + B +1 +5 -2 +1 -1 2KClO3 2KCl + 3O2

Types of Oxidation-Reduction Reactions 3. Combustion Reactions A combustion reaction is a reaction in which a substance reacts with oxygen, usually with the release of heat and light to produce a flame A + O2 B +4 -2 S + O2 SO2 +2 -2 2Mg + O2 2MgO