Final answer:
The equilibrium constant expression for the given equation is K = [Zn²+][Ag]².
Step-by-step explanation:
The substances that will appear in the equilibrium constant expression for the given equation are Zn²+(aq) and Ag(s). In this equation, Zn²+ is a reactant and Ag is a product. The equilibrium constant expression is written as K = [Zn²+][Ag]².