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This is a collection of coloured chemicals. Credit: Puppy8800.{{free media}}

Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties.[1][2] Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds.

Most of Wikiversity's content on chemistry can currently be found at the School:Chemistry page.


As an introduction to science, the Scale of the Universe is mapped to the Branches of Science. Credit: Eric Fisk.{{free media}}

Def. a natural science "that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their molecules"[3] is called chemistry.

Def. a science that deals with

  1. the identification of the substances of which matter is composed,
  2. the investigation of their properties and the ways in which they interact, combine, and change, and
  3. the use of these processes to form new substances

is called chemistry.

Def. "a science that deals with the composition, structure, and properties of substances and of the transformations that they undergo"[4] is called chemistry.


A large, modern fertilizer spreader is a major part of agricultural phosphate biochemistry. Credit: Rasbak.

Agricultural chemistry is the study of both chemistry and biochemistry which are important in agricultural production, the processing of raw products into foods and beverages, and in environmental monitoring and remediation. These studies emphasize the relationships between plants, animals and bacteria and their environment.

Agricultural chemistry often aims at preserving or increasing the fertility of soil, maintaining or improving the agricultural yield, and improving the quality of the crop.

Analytical chemistry[edit]

Chemicals in labeled flasks include Ammonium Hydroxide (Aqueous ammonia) and Nitric acid lit in different colours. Credit: Joe Sullivan.{{free media}}

Analytical chemistry is the analysis of material samples to gain an understanding of their chemical composition and structure. Analytical chemistry incorporates standardized experimental methods in chemistry. These methods may be used in all subdisciplines of chemistry, excluding purely theoretical chemistry.


Astrochemistry is the study of the chemical composition of stars and outer space.


Biochemistry is the study of the chemicals, chemical reactions and chemical interactions that take place in living organisms. Biochemistry and organic chemistry are closely related, as in medicinal chemistry or neurochemistry. Biochemistry is also associated with molecular biology and genetics.

Combinatorial chemistry[edit]

Combinatorial chemistry involves the rapid synthesis or the computer simulation of a large number of different but structurally related molecules.

Inorganic chemistry[edit]

Inorganic chemistry is the study of the properties and reactions of inorganic compounds. The distinction between organic and inorganic disciplines is not absolute and there is much overlap, most importantly in the sub-discipline of organometallic chemistry.

Materials chemistry[edit]

The image shows the electric circuit of the passivation layers. Credit: P. Neuderth, P. Hille, J. Schörmann, A. Frank, C. Reitz, S. Martí-Sánchez, M. de la Mata, M. Coll, J. Arbiol, R. Marschall and M. Eickhoff.{{fairuse}}

The "influence of ultra-thin TiO2, CeO2 and Al2O3 coatings deposited by atomic layer deposition on the photoelectrochemical performance of InxGa1−xN/GaN nanowire (NW) [photoelectrodes:] The passivation of surface states results in an increase of the anodic photocurrent (PC) by a factor of 2.5 for the deposition of 5 nm TiO2. In contrast, the PC is reduced for CeO2- and Al2O3-coated NWs due to enhanced defect recombination in the passivation layer or increased band discontinuities. Furthermore, photoelectrochemical oxidation of the InxGa1−xN/GaN NW photoelectrode is attenuated by the TiO2 layer and completely suppressed for a layer thickness of 7 nm or more. Due to efficient charge transfer from the InxGa1−xN NW core a stable TiO2-covered photoanode with visible light excitation is realized."[5]


Neurochemistry is the study of neurochemicals; including transmitters, peptides, proteins, lipids, sugars, and nucleic acids; their interactions, and the roles they play in forming, maintaining, and modifying the nervous system.

Nuclear chemistry[edit]

Nuclear chemistry is the study of how subatomic particles come together and make nuclei. Modern Transmutation is a large component of nuclear chemistry, and the table of nuclides is an important result and tool for this field.

Organic chemistry[edit]

Organic chemistry is the study of the structure, properties, composition, mechanisms, and reactions of organic compounds. An organic compound is defined as any compound based on a carbon skeleton.

Physical chemistry[edit]

Physical chemistry is the study of the physical and fundamental basis of chemical systems and processes. In particular, the energetics and dynamics of such systems and processes are of interest to physical chemists. Important areas of study include chemical thermodynamics, chemical kinetics, electrochemistry, statistical mechanics, spectroscopy, and more recently, astrochemistry.[6] Physical chemistry has large overlap with molecular physics. Physical chemistry involves the use of infinitesimal calculus in deriving equations. It is usually associated with quantum chemistry and theoretical chemistry. Physical chemistry is a distinct discipline from chemical physics, but again, there is very strong overlap.

Quantum chemistry[edit]

Quantum chemistry is the area of chemistry concerned with quantum computations of molecular properties and chemical reactions, including also theories and mechanisms of chemical reactions and processes.

Theoretical chemistry[edit]

Theoretical chemistry is the study of chemistry via fundamental theoretical reasoning (usually within mathematics or physics). In particular the application of quantum mechanics to chemistry is called quantum chemistry. Since the end of the Second World War, the development of computers has allowed a systematic development of computational chemistry, which is the art of developing and applying computer programs for solving chemical problems. Theoretical chemistry has large overlap with (theoretical and experimental) condensed matter physics and molecular physics.


Thermochemistry is the study of energy and temperature changes in a chemical process, and is closely related to thermodynamics.

Projects, courses, lessons, lectures[edit]

See also[edit]


  1. What is Chemistry?. Chemweb.ucc.ie. Retrieved 2011-06-12.
  2. Chemistry. (n.d.). Merriam-Webster's Medical Dictionary. Retrieved August 19, 2007.
  3. Paul G (23 February 2004). chemistry. San Francisco, California: Wikimedia Foundation, Inc. Retrieved 2016-08-25.
  4. Philip B. Gove, ed. (1963). Webster's Seventh New Collegiate Dictionary. Springfield, Massachusetts: G. & C. Merriam Company. p. 1221. |access-date= requires |url= (help)
  5. P. Neuderth, P. Hille, J. Schörmann, A. Frank, C. Reitz, S. Martí-Sánchez, M. de la Mata, M. Coll, J. Arbiol, R. Marschall and M. Eickhoff (06 December 2017). "Passivation layers for nanostructured photoanodes: ultra-thin oxides on InGaN nanowires". Journal of Materials Chemistry A. doi:10.1039/C7TA08071A. http://pubs.rsc.org/en/content/articlelanding/2018/ta/c7ta08071a#!divAbstract. Retrieved 2017-12-11. 
  6. Herbst, Eric (May 12, 2005). "Chemistry of Star-Forming Regions". Journal of Physical Chemistry A 109 (18): 4017–4029. doi:10.1021/jp050461c. PMID 16833724. 

External links[edit]

{{Phosphate biochemistry}}