Physical chemistry is the study of macroscopic, and particulate phenomena in chemical systems in terms of the principles, practices, and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, analytical dynamics and chemical equilibriumPredicting the properties of chemical compounds from an outline of atoms and the way they bond is one in all the foremost goals of chemical science. chemical compounds may be represented as teams of atoms warranted along and chemical reactions may be represented because the creating and breaking of these bonds. Quantum chemistry, a subfield of physical chemistry especially concerned with the application of quantum mechanics to chemical problems, provides tools to determine how strong and what shape bonds are,how nuclei move, and how light can be absorbed or emitted by a chemical compound.Spectroscopy is the related sub-discipline of physical chemistry which is specifically concerned with the interaction of electromagnetic radiation with matter.