There are two forms of chemical equations
Ion equation: written in ion form (as separated ions) which forms the net ionic equation after removing an ion spectator
Molecular equation: written in molecular form
2AgNO₃(aq) + H₂S(aq) ⇒ Ag₂S(s) + 2HNO₃(aq)
The above reaction can be included in a double replacement reaction⇒ an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
It can be shown the existence of the precipitation reaction, which is the formation of insoluble Ag₂S (not dissolve)