Free open-source Modelica library called Chemical 2.0 (https://github.com/MarekMatejak/Chemical) provides expressions between chemical substances and processes. These robust and unified definitions allow users to choose whether define processes or substances in their dynamic (electro-)chemical models. Propagation of substance definition and chemical solution through connected components simplify configuration. Chemical pathways can start even with unknown substances. Chemical kinetics was rewritten. The possibilities and performance of chemical pathways modeling are increased using a new type of connectors based on inertial electro-chemical potential. Chemical processes can be directly connected without need to add unsignificant states. Parameterization of chemical reactions is also streamlined, e.g. using forward rate and dissociation coefficient.