9-2 Chem rxns are rep by chem equations. Usu just called an equation. There are 4 general types of chem rxns. AX is a comp. Most decomp rxns take place only when E in the form of heat, light or electricity is added.
Electrolysis is the decomp of a subs.
Activity series of the elements a. The ability of an ele to react is referred to as the activity of the ele. The most active ele at the top can replace every element below it. An element farther down can replace those ele. Most dd rxns will not occur unless the reactants are dissolved in water so that the comp can separate into ions.