This book presents and discusses current research in the study of chemical modelling. Topics discussed include chemical action and the transition state reactivity; algebraic chemistry of catalysis; solid-state polymerisation kinetics; fractal features of proteins structure and dynamics; modelling on methanol clusters; chemical hardness assessment of aromaticity for certain organic compounds; dependence of thermodynamic characteristics on spatial-energy parameter or free atoms and the scattering of particles and waves on nucleon nodes of the atom.