Chemistry (from Egyptian kēme (chem), meaning "earth" is the science treating matter at the atomic to macromolecular scale, the reactions, transformations and aggregations of matter, as well as accompanying energy and entropy changes during these processes. In short, chemistry studies molecules, crystals, and metal/nonmetals and is concerned with the composition and statistical properties of such structures, as well as their transformations and interactions to become materials encountered in everyday life. According to modern chemistry, the physical properties of materials are generally determined by their structure at the molecular or atomic scale, which is itself defined by interatomic electromagnetic forces, and laws of quantum mechanics and thermodynamics from various fields of physics. Robert Boyle (1661), Antoine Lavoisier (1787), and John Dalton (1808) can be considered the three fathers of modern chemistry, while some consider the earlier chemist Geber (d. 815) to be the "father of chemistry".
Source: http://en.wikipedia.org/wiki/Chemistry
Source: http://en.wikipedia.org/wiki/Chemistry