In Physics a reversible process is defined as one in which the system can be returned to its initial conditions via the same path (along the PV Diagram), and every point along the path is an equilibrium state. An irreversible physical process is one that does not meet those conditions.
In Chemistry, reactions involving aqueous and gaseous products or reactants are reversible, meaning that they flow in both directions. Each reversible chemical reaction has a K value that relates the ratio of the concentration of products to reactants (taken to the power of their coefficients) at equilibrium. Irreversible chemical reactions are ones that either consist of only solids or liquids, or are reversible chemical reactions that just have a extremely large/small K value where they practically move in only one direction.
From a physics point of view a process is irreversible if it increases the entropy of the universe, and a reversible process is where the entropy of the universe remains constant. Does this mean that all reactions involving aqueous and gaseous products or reactants don't increase or decrease the entropy of the universe? Is it possible that reversible physical (thermodynamic) systems are not related to reversible chemical reactions?