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Reaction Types Slide 2 Synthesis Synthesis reactions involve 2 or more reactants combining to form a more complex product. Slide 3 Decomposition Decomposition reactions occur when complex reactants divide and form into simpler products. Slide 4 Single Replacement One more reactive element replaces a less reactive ion in solution. Slide 5 Double Replacement Two compounds exchange ion partners. Usually evidenced by gas or precipitate formation. Slide 6 Combustion When one substance burns to combine with oxygen. Organic compounds often produce CO 2 and H 2 O.