Displacement: There are several different types of displacement reactions, including single, double, and acid-base.
An example of a single substitution reaction (A + BC AC + B) occurs when zinc combines with hydrochloric acid. The zinc replaces the hydrogen: Zn + 2 HCl ZnCl2 + H2
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A double displacement (metathesis) reaction has two compounds exchanging bonds to form new compounds (AB + CD –> AD + CB). Antacids like calcium hydroxide (CaOH) combine with stomach acid (HCl) to form calcium chloride salt (CaCl2) and water (H2O).
CaOH + HCl CaCl2 + H2O
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