Here, we test two model systems of a different chemical nature. To validate our model, we tested a water dimer and water/cation systems in which a single water molecule is treated as a QM subsystem. In those systems, we varied the distance between the rigid QM and MM fragments. The original structures of these systems were taken from The Cambridge Energy Landscape Database . We focus on the variation of the total system energies and the QM/MM permanent and induced energy contributions when different scaling factors are used for covalent radii in the model systems.