What is the difference between a decomposition reaction and a replacement reaction?

1 Answer
Apr 12, 2014

A decomposition reaction is one where a compound is broken down into its constituent chemical species:

www.chemistryland.com
For example:

#2NaCl -> 2Na^+ + Cl_2^-#

The #NaCl# was broken down into the constituents #Na^+# and #Cl_2^-#

--(side note: the #Cl# is diatomic that explains the #2#)

There are two types of replacement reactions, observe the differences:

single replacement reactions chemistry,com
Single Replacement: #AB + C -> AC + B#

double replacement reaction from chemistrycom

Double Replacement: #AB + CD -> AD + CB#