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Reaction Types. Synthesis. Synthesis reactions involve 2 or more reactants combining to form a more complex product. 2Mg(s) + O 2 (g) → 2MgO(s). Decomposition. Decomposition reactions occur when complex reactants divide and form into simpler products. 2H 2 O 2 (l) → O 2 (g) + 2H 2 O ( l).
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Synthesis Synthesis reactions involve 2 or more reactants combining to form a more complex product. 2Mg(s) + O2(g) → 2MgO(s)
Decomposition Decomposition reactions occur when complex reactants divide and form into simpler products. 2H2O2(l) → O2(g) + 2H2O (l)
Single Replacement One more reactive element replaces a less reactive ion in solution. Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
Double Replacement Two compounds exchange ion partners. Usually evidenced by gas or precipitate formation. Pb(NO3)2(aq) + 2KI(aq) → 2KNO3 (aq) + PbI2(s)
Combustion When one substance burns to combine with oxygen. Organic compounds often produce CO2 and H2O. 2C3H8O(g) + 9O2(g)→ 6CO2(g) + 8H2O(g)