Question

a chemical reaction in which two elements or radicals change places with two other elements or radicals is a ______ reaction. a) double replacement b) substitution

Explanation:

In chemical reactions, a double replacement reaction is defined as a reaction where two compounds exchange ions (or elements/radicals) such that two elements or radicals from one compound swap places with two from another. A substitution reaction typically involves one atom or group being replaced by another (not two pairs swapping). So the reaction described matches double replacement.

Answer:

A) double replacement