Question 13:

What is the difference between displacement and double displacement reactions?

Write equations for these reactions.

Answer

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

In a double displacement reaction, two atoms or a group of atoms switch places to

form new compounds.

AB + CD → AD + CB

For example :

Displacement reaction:

CuSO_4(aq) + Zn_(s) → ZnSO_4(aq) + Cu_(s)

Double displacement reaction:

Na₂SO_4(aq) + BaCl_2(aq) → BaSO_4(s) + 2NaCl_(aq)

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