Question

using balanced equation,explain the difference between a displacement reaction and a double displacement reaction?

Answer 1

In displacement reaction, one element from its salt is displaced by a more reactive element e.g. in following example, Cu is displaced by Zn from CuSO4 because Zn is more reactive.
CuSO4 + Zn —> ZnSO4 + Cu
In double displacement reaction, exchange of ions takes place between two reactants to form new products.
Na2SO4 + BaCl2 —> BaSO4 + 2NaCl

Answer 2

Displacement reaction=It is a chemical reaction in which an element replaces another element in a compound and takes it place.
Reaction =CL2+2KI-2KCL+ I2
Double displacement reaction=It is a chemical reaction in which two compounds in their aqueous solutions react to form two new compounds by the mutual exchange of their radicals.
Reaction=CuO+ 2HCL- CuCL2+ H2O.