Synthesis Reactions: two or more elements combine to form one product, A + B → AB, 2 H2(g) + O2(g) → 2 H2O(g), Decomposition Reactions: One compound breaks into elements or smaller compounds, AB→A+B, 2HgO(s)→2Hg(l)+O2(g), Single Replacement Reactions: part of an ionic compound is removed and replaced by a new element, A+BC→AC+B, 2Ag+H2S→Ag2S+H2, Double Replacement Reactions: Ionic compounds dissolved in water switch partners, AB+CD→AD+CB, 2KI(aq)+Pb(NO3)2(aq)→2KNO3(aq)+PbI2(s), Combustion Reactions: A hydrocarbon is combined with oxygen to produce carbon dioxide and water, C3H8(g)+5O2(g)→3CO2(g)+4H2O(g),

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