Chemistry starts with the study of matter and the changes or reactions that occur on that matter. The reactions can produce a variety of simple as well as complicated products. Atoms form molecules and eventually molecules form compounds, bodies and materials, whether living or non-living. The nature of atoms af ects the formation and properties of matter that may be in the form of compounds, minerals and rocks, cells, DNA, composites, polymers, pesticides and so on.

The development of computer and technology allow the structure of a molecule and materials to be designed and simulated by its nature or character. In other words, the material can be designed according to the requirements of the user or applications. The chemistry has been cross-border areas because almost all areas of basic sciences such as biology, geology, agriculture, physics, materials science, manufacturing, chemical engineering and require chemistry knowledge. The role of the chemist in the new millennium is more dynamic and needed in various fields and in more multidisciplinary careers