Metathesis or double displacement reaction:
in which two compounds exchange ions or bonds to form different compounds
NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)
Single displacement or substitution
Single displacement or substitution:
characterized by an element being displaced out of a compound by a more reactive element:
2 Na(s) + 2 HCl(aq) → 2 NaCl(aq) + H2(g)
2 Na(s) + 2 HCl(aq) → 2 NaCl(aq) + H2(g)
Direct combination or synthesis
Direct combination or synthesis: in which 2 or more chemical elements or compounds unite to form a more complex product: N2 + 3 H2 → 2 NH3
A chemical synthesis begins by selection of compounds that are known as reagents or reactants. Various reaction types can be applied to these to synthesize the product, or an intermediate product. This requires mixing the compounds in a reaction vessel such as a chemical reactor or a simple round-bottom flask. Many reactions require some form of work-up procedure before the final product is isolated.
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