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40,000 BCE
Paleolithic period
The earliest recorded metal employed by humans seems to be gold which can be found free or "native". Small amounts of natural gold have been found in Spanish caves used during the late Paleolithic period, c. 40,000. -
900 BCE
Classical antiquity and atomism
Philosophical attempts to rationalize why different substances have different properties (color, density, smell), exist in different states (gaseous, liquid, and solid), and react in a different manner when exposed to environments, for example to water or fire or temperature changes, led ancient philosophers to postulate the first theories on nature and chemistry. The history of such philosophical theories that relate to chemistry can probably be traced back to every single ancient civilization. -
300 BCE
Medieval alchemy
The elemental system used in Medieval alchemy was developed primarily by the Arabian alchemist Jābir ibn Hayyān and rooted in the classical elements of Greek tradition.[14] His system consisted of the four Aristotelian elements of air, earth, fire, and water in addition to two philosophical elements: sulphur, characterizing the principle of combustibility; "the stone which burns", and mercury, characterizing the principle of metallic properties. -
Iatrochemistry
Iatrochemistry (or chemical medicine) is a branch of both chemistry and medicine. The word "iatro" was the Greek word for "physician" or "medicine." Having its roots in alchemy, iatrochemistry seeks to provide chemical solutions to diseases and medical ailments.
wide use in South Asia, East Asia and amongst their diasporic communities worldwide. -
Phlogiston theory
The phlogiston theory is a superseded scientific theory that postulated that a fire-like element called phlogiston is contained within combustible bodies and released during combustion. The name comes from the Ancient Greek φλογιστόν phlogistón (burning up), from φλόξ phlóx (flame). It was first stated in 1667 by Johann Joachim Becher, and then put together more formally by Georg Ernst Stahl. -
Modern chemistry
The study of the structure and composition, properties and transformation of substances. It is to this that Chemistry is dedicated . Put that way , it may seem a limited company but far from it. -
Inorganic chemistry
Inorganic chemistry handles the integrated study of the formation , composition, structure and chemical reactions of the elements and inorganic compounds ( for example , sulfuric acid or calcium carbonate ) ; ie those who have no carbon -hydrogen bonds , because they belong to the field of organic chemistry -
Physical chemistry
in physical chemistry is a branch where a change of various sciences , such as chemistry , physics, thermodynamics , electrochemistry and quantum mechanics where mathematical functions may represent structural interpretations molecular and atomic level occurs . Changes in temperature , pressure, volume , heat and work in solid, liquid and / or gaseous systems are also related to these interpretations of molecular interactions . -
organic chemistry
cOrganic chemistry is the branch of chemistry that studies a large class of molecules that mostly contain carbon to form carbon-carbon or carbon - hydrogen and other hetero atoms, covalent bonds also known as organic compounds. Because of the ubiquity of carbon compounds that this branch of chemistry studying this discipline is also called carbon chemistry . -
Biochemistry
Biochemistry is a science that studies the chemical composition of living beings, especially proteins , carbohydrates , lipids and nucleic acids , and other small molecules present in cells and chemical reactions suffered by these compounds (metabolism ) that allow them to obtain energy ( catabolism) and generate own biomolecules (anabolism ) . Biochemistry is based on the concept that all living containing carbon and biomolecules in general are mainly.
