A reactant or reagent is a substance consumed during a chemical reaction.^[1] Solvents and catalysts, although they are involved in the reaction, are usually not referred to as reactants. For other uses, see Chemical reaction (disambiguation). ... For other uses, see Solvent (disambiguation). ... A catalyst (Greek: καταλύτης) is a substance that accelerates the rate of a chemical reaction, at some temperature, but without itself being transformed or consumed by the reaction (see also catalysis). ...

Although the terms reactant and reagent are often used interchangeably, reagent is often used in a more specialized sense as "a test substance that is added to a system in order to bring about a reaction or to see whether a reaction occurs".^[1] Examples of such analytical reagents include Fehling's reagent and Tollens' reagent. In organic chemistry, reagents are compounds or mixtures, usually composed of inorganic or small organic molecules, that are used to effect a transformation on an organic substrate. Examples of organic reagents include the Collins reagent, Fenton's reagent, and Grignard reagent. Fehlings solution is a solution used to differentiate between water soluble aldehyde and ketone functional groups. ... Ball-and-stick model of the diamminesilver(I) cation, [Ag(NH3)2]+ Tollens reagent is usually ammoniacal silver nitrate, but can also be other things, as long as there is an aqueous diamminesilver(I) complex. ... The Collins reagent is the complex of chromium(VI) oxide with pyridine in dichloromethane. ... Fentons reagent is a solution of hydrogen peroxide and an iron catalyst that is used to oxidize contaminants or waste waters. ... A Grignard Reagent is an alkyl- or aryl- magnesium halide. ...

In another use of the term, when purchasing or preparing chemicals, "reagent-grade" describes chemical substances of sufficient purity for use in chemical analysis, chemical reactions or physical testing. Purity standards for reagents are set by organizations such as ASTM International. For instance, reagent-quality water must have very low levels of impurities like sodium and chloride ions, silica, and bacteria, as well as a very high electrical resistivity. Water and steam are two different forms of the same chemical substance A chemical substance is a material with a definite chemical composition. ... ... Analytical chemistry is the analysis of material samples to gain an understanding of their chemical composition and structure. ... For other uses, see Chemical reaction (disambiguation). ... “Standard” redirects here. ... ASTM International (ASTM) is an international standards developing organization that develops and publishes voluntary technical standards for a wide range of materials, products, systems, and services. ... H2O and HOH redirect here. ... For sodium in the diet, see Edible salt. ... The chloride ion is formed when the element chlorine picks up one electron to form an anion (negatively-charged ion) Cl−. The salts of hydrochloric acid HCl contain chloride ions and can also be called chlorides. ... The chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2. ... Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ... // Headline text POOP!! Danny Hornsby (also known as Gnome) is a measure indicating how strongly a Gnome can opposes the flow of electric current. ...

Reactants are on the left side of a chemical equation for a specific chemical equation.

Reactants are on the left side of a chemical equation for a specific chemical reaction.