Difference and relation between molecular Simulation and Quantum Chemistry Different scopes (lenght and time scales Quantum chemistry Electronic level. one or a few atoms or molecules Microscopic length and time scales Bond energy, Transition state etc Molecular simulation Atomic and molecular level, large assembly of atoms and molecules Larger length and time scales Effects of inter-molecular interactions, dynamics(non reacting and reacting systemsDifference and relation between Molecular Simulation and Quantum Chemistry Different scopes (lenght and time scales): - Quantum chemistry Electronic level, one or a few atoms or molecules. Microscopic length and time scales. Bond energy, Transition state etc.. - Molecular simulation Atomic and molecular level, large assembly of atoms and molecules. Larger length and time scales. Effects of inter-molecular interactions, dynamics (non reacting and reacting systems)