N a combination redox reaction, two or more REACTANTS, at least one of which is an ELEMENT, form a COMPOUND. General reaction: X+Y->Z In a decomposition redox reaction, a COMPOUND forms two or more PRODUCTS, at least one of which is an ELEMENT. General reaction: Z->X+Y

In double-displacement (metathesis) reactions, such as precipitation and acid-base reactions, ATOMS (OR IONS) of two COMPOUNDS exchange places; these reactions ARE NOT redox processes. General reaction: AB+CD->AD+CB

In solution, single-displacement reactions occur when an ATOM of one ELEMENT displaces the ION of another. Since one of the REACTANTS is an ELEMENT, all single-displacement reactions ARE redox processes. General reaction: X+YZ->XZ+Y

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