<Dl> <Dd> Mg + 2 H 2 O ⟶ Mg (OH) 2 + H 2 ↑ (\ displaystyle (\ ce (Mg + 2H2O -> Mg (OH) 2 + H2 (^)))) </Dd> </Dl> <Dd> Mg + 2 H 2 O ⟶ Mg (OH) 2 + H 2 ↑ (\ displaystyle (\ ce (Mg + 2H2O -> Mg (OH) 2 + H2 (^)))) </Dd> <P> In a double replacement reaction, the anions and cations of two compounds switch places and form two entirely different compounds . These reactions are in the general form: </P> <Dl> <Dd> AB + CD ⟶ AD + CB (\ displaystyle (\ ce (AB + CD -> AD + CB))) </Dd> </Dl>

When is a chemical reaction considered to be a double displacement reaction
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