Question

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Answer 1

In a displacement reaction, a more reactive element replaces a less reactive element from a compound.
A + BX \(→\) AX + B, where A is more reactive than B.
For example: Displacement reaction: CuSO_4(aq) + Zn_(s) \(→\) ZnSO_4(aq) + Cu_(s)

In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds.
AB + CD \(→\) AD + CB
For example: Double displacement reaction: Na₂SO_4(aq) + BaCl_2(aq) \(→\) BaSO_4(s) + 2NaCl_(aq)