#1. A reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a _____ reaction.
#2. The _____ is the amount of one material present in a given volume of another material.
The reaction in which one element replaces another or an exchange of places of cations or anions takes places, the reaction is called a displacement reaction. Density is the amount (mass) of material occupying a given volume.
