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...ell. It is a [[weak acid]], in that it is only a partially [[dissociation (chemistry)|dissociated]] acid in an [[aqueous solution]]. Pure, [[water]]-free acetic ...reagent|chemical reagent]] and industrial chemical, used in the production of [[polyethylene terephthalate]] mainly used in soft drink bottles; [[cellulo

...[[pseudoephedrine]] as its principal active constituents. The same is true of other herbal products containing extracts from ''Ephedra'' species. ==Chemistry==

[[Image:Single Polymer Chains AFM.jpg|right|thumb|175px|Appearance of real linear polymer chains as ...u Conformation of Adsorbed Flexible Polyelectrolyte Chains|journal=Journal of the American Chemical Society|volume=127|issue=45|pages=15688–15689|year=

[[Image:Polyethylene-3D-vdW.png|thumb|Space-filling model of a '''polyethylene''' chain.]] [[Image:Polyethylene-repeat-2D.png|thumb|The repeating unit of '''polyethylene''', showing its [[stereochemistry]].]]

...Kochendes wasser02.jpg|thumb|right|Water and steam are two different forms of the same chemical substance.]] In [[chemistry]], a '''chemical substance''' is a [[material]] with a specific [[Chemical

| OtherNames = C24:0 ([[Fatty acid#Nomenclature|Lipid numbers]]) ...ure and Applied Chemistry |volume=73 |issue=4 |pages=685–744 |url=http://iupac.org/publications/pac/73/4/0685/ |doi=10.1351/pac200173040685 }}</ref>

...C₆H₄(OH)₂. It is the ''ortho'' [[isomer]] of the three isomeric [[benzenediol]]s. This colourless compound occurs natura ...microglia cells: Inhibition of microglial neurotoxicity. European Journal of Pharmacology, Volume 588, Issue 1, 24 June 2008, Pages 106-113</ref>

...oranocarbonate: a convenient in situ CO source for the aqueous preparation of [^99mTc(OH₂)₃(CO)₃]⁺ ...Cryptand''' is one of the most important member of the [[cryptand]] family of [[chelating agent]]s.

...etry''' is used in a number of related fields of chemistry and solid state chemistry/physics. The coordination geometry of an atom is the geometrical pattern formed by atoms around the central atom.

{{About|the co-ordination of a ligand to a central atom|the sense of touch in technology|Haptic technology}} ...perscripted number following the η denotes the number of contiguous atoms of the ligand that are bound to the metal. In general the η-notation is only

...or ion (usually metallic), [[chemical bond|bonded]] to a surrounding array of molecules or anions ([[ligand]]s, complexing agents). <ref>[http://goldbook.iupac.org/C01203.html IUPAC definition of complex]</ref>

...ral atom.<ref name = "IUPAC inorganic">NOMENCLATURE OF INORGANIC CHEMISTRY IUPAC Recommendations 2005 ed. N. G. Connelly et al. RSC Publishing ...in which case it is followed by the '''configuration index'''.<ref name = "IUPAC inorganic"/>

...is the most produced [[organic compound]] in the world; global production of ethylene exceeded 107 million metric tonnes in 2005.<ref>“Production: Gro ...C-H [[angle]] is 119°, close to the 120° for ideal sp² [[hybridization (chemistry)|hybridized]] carbon. The molecule is also relatively rigid: rotation about

...units]], then it is typically called a [[spectrophotometer]]. The majority of spectrophotomers are used in spectral regions near the [[visible spectrum]] ...nge because of the different techniques used to measure different portions of the spectrum. Below optical frequencies (that is, at [[microwave]] and [[ra