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- R-410ARefrigerant fluid
- R717 (South Africa)The R717 is a Regional Route in South Africa that connects Colesberg with Dewetsdorp via T
- Rabbit hairFur from rabbit
- Racemic mixtureMixture with equal amounts of left- and right-handed chiral isomers
- RacemizationConversion of an optically active chemical compound into an inactive form
- Radical (chemistry)Atom, molecule, or ion that has an unpaired valence electron; typically highly reactive
- Radical disproportionationRadical disproportionation encompasses a group of reactions in organic chemistry in which
- Radical polymerizationPolymerization process involving free radicals as repeating units
- Radioactive tracerChemical compound
- Radioanalytical chemistryRadioanalytical chemistry focuses on the analysis of sample for their radionuclide content
- Radiocarbon (journal)Radiocarbon is a scientific journal devoted to the topic of radiocarbon dating.
- RadiochemistryChemistry of radioactive materials
- Radioisotope thermoelectric generatorElectrical generator that uses heat from radioactive decay
- RadioluminescenceLight produced in a material by bombardment with ionizing radiation
- RadiolysisRadiolysis is the dissociation of molecules by ionizing radiation. It is the cleavage of o
- RadiopharmaceuticalRadiopharmaceuticals, or medicinal radiocompounds, are a group of pharmaceutical drugs con
- RadiumChemical element with atomic number 88 (Ra)
- Radium-223Isotope of radium
- Radium-226Isotope of radium
- RadonChemical element with atomic number 86 (Rn)
- Radon-222Radon-222 (222Rn, Rn-222, historically radium emanation or radon) is the most stable isoto
- Rainer Ludwig ClaisenGerman chemist (1851–1930)
- Ralph F. HirschmannAmerican biochemist
- Ralph LandauAmerican chemical engineer (1916–2004)
- Raman spectroscopySpectroscopic technique
- Random column packingRandom column packing is the practice of packing a distillation column with randomly fitti
- Raoult's lawLaw of thermodynamics for vapour pressure of a mixture
- Rare-earth barium copper oxideChemical compounds known for exhibiting high temperature superconductivity
- Rare-earth elementAny of the fifteen lanthanides plus scandium and yttrium
- Rare-earth mineralMineral containing one or more rare-earth elements as major constituents
- Rate equationRelation between chemical reaction rate and concentrations of the reactants
- Rate-determining stepSlowest step of a chemical reaction
- Reaction coordinateAbstract coordinate depicting chemical reaction progress
- Reaction intermediateMolecular entity formed as an elementary step in a multi-step chemical reaction
- Reaction mechanismAny model explaining a chemical reaction
- Reaction quotientQuantity in chemical thermodynamics
- Reaction rateSpeed at which a chemical reaction takes place
- Reaction rate constantCoefficient of rate of a chemical reaction
- Reactive intermediateIn chemistry, a reactive intermediate or an intermediate is a short-lived, high-energy, hi
- Reactivity (chemistry)Proclivity of a chemical substance to undergo a reaction
- Reactivity seriesChemical Property
- ReagentSubstance added to a system to cause a chemical reaction
- Rearrangement reactionChemical reaction where a molecule is turned into a structural isomer of itself
- RecipeInstructions for preparing food
- Recommended exposure limitLimit for exposure to a chemical substance
- Recrystallization (chemistry)Separation and purification process of crystalline solids
- Recycling codesRecycling codes are used to identify the materials out of which the item is made, to facil
- Recycling symbolSymbol used to designate recyclable materials
- RedoxChemical reaction involving changes in oxidation state
- Redox indicatorIndicator which undergoes a definite color change at a specific electrode potential
- Reducing agentChemical species that donates an electron to another species in a redox reaction
- Reducing sugarSugars that contain free OH group at the anomeric carbon atom
- Reduction potentialMeasure of the tendency of a substance to gain or lose electrons
- Reference electrodeA reference electrode is an electrode that has a stable and well-known electrode potential
- Refining (metallurgy)Process of purifying metals
- RefluxReflux is a technique involving the condensation of vapors and the return of this condensa
- RefractoryMaterials resistant to decomposition under high temperatures
- Refractory metalsHeat- and wear-resistant metals
- Regulation of chemicalsThe regulation of chemicals is the legislative intent of a variety of national laws or int
- Relative atomic massType of atomic measurement
- Relativistic quantum chemistryTheories of quantum chemistry explained via relativistic mechanics
- Repeat unitSection of a polymer whose repetition would reproduce the polymer chain
- Research instituteEstablishment endowed for doing research
- ResinOrganic polymer, typically from plants
- Resin identification codeSymbol to identify the type of plastic
- Resonance (chemistry)Description of a molecule's true bond structure as a combination of structures
- Retro-Diels–Alder reactionThe retro-Diels–Alder reaction (rDA reaction) is the reverse of the Diels–Alder (DA) react
- Retrosynthetic analysisTechnique for solving problems in the planning of organic syntheses
- Reverse osmosisWater purification process
- Reversed-phase chromatographyReversed-phase liquid chromatography (RP-LC) is a mode of liquid chromatography in which n
- Reversible reactionChemical reaction whose products can react together to produce the reactants again
- Reversible-deactivation radical polymerizationType of chain polymerization
- ReviewEvaluation
- RheniumChemical element with atomic number 75 (Re)
- RhodiumChemical element with atomic number 45 (Rh)
- Ribbon diagram3D schematic representation of protein structure
- Richard Adolf ZsigmondyAustrian-born chemist (1865–1929)
- Richard BaderRichard F. W. Bader FRSC FCIC (October 15, 1931 – January 15, 2012) was a Canadian quantum
- Richard D. AdamsRichard Donald Adams (June 14, 1909 – September 5, 1987) was an American officer in the Un
- Richard F. HeckAmerican chemist (1931–2015)
- Richard KuhnAustrian-German biochemist (1900–1967)
- Richard Laurence Millington SyngeBritish biochemist (1914–1994)
- Richard LernerRichard Alan Lerner (August 26, 1938 – December 2, 2021) was an American research chemist.
- Richard R. SchrockRichard Royce Schrock (born January 4, 1945) is an American chemist and Nobel laureate rec
- Richard WillstätterGerman chemist (1872–1942)
- Rigoberto HernandezAmerican chemist and academic (born 1967)
- Ring flipProcess in organic chemistry
- Ring strainInstability in molecules with bonds at unnatural angles
- Ring-opening polymerizationChain polymerization involving cyclic monomers
- RipeningProcess in fruits that causes them to become more palatable
- Riverside Cemetery (Oshkosh, Wisconsin)Riverside Cemetery is located in Oshkosh, Wisconsin and was listed on the U.S. National Re
- Roald HoffmannNobel laureate theoretical chemist
- Roasting (metallurgy)Process of heating a sulfide ore
- Robert HavemannGerman chemist and dissident (1910–1982)
- Robert Kane (chemist)Irish chemist
- Robin M. HochstrasserScottish chemist
- Robinson–Gabriel synthesisThe Robinson–Gabriel synthesis is an organic reaction in which a 2-acylamino-ketone reacts
- Rocket propellantChemical or mixture used in a rocket engine
- Rodolfo BrennerArgentine biochemist
- RoentgeniumChemical element with atomic number 111 (Rg)
- Roland Victor NorrisRoland Victor Norris (1888 – 28 April 1950) was a biochemist and agricultural scientist wh
- Rolf HuisgenRolf Huisgen (German: ; 13 June 1920 – 26 March 2020) was a German chemist. His importance
- Romang (island)Romang is an island, part of the Barat Daya Islands in Indonesia, located at 7°35′00″S 127
- Room air distributionRoom air distribution is characterizing how air is introduced to, flows through, and is re
- Room temperatureRange of indoor air temperatures preferred by most people
- RosinSolid form of plant resin
- RotamerVarious molecular structures formed only by rotation about single bonds
- Rotary evaporatorA rotary evaporator (rotovap) is a device used in chemical laboratories for the efficient
- Royal Academy of PharmacyThe Royal National Academy of Pharmacy (Spanish: Real Academia Nacional de Farmacia) is a
- Royal Society of ChemistryLearned society in the United Kingdom
- RubidiumChemical element with atomic number 37 (Rb)
- Rubidium acetateRubidium acetate is a rubidium salt that is the result of reacting rubidium metal, rubidiu
- Rubidium bromideRubidium bromide is an inorganic compound with the chemical formula RbBr. It is a salt of
- Rubidium carbonateRubidium carbonate, Rb2CO3, is a convenient compound of rubidium; it is stable, not partic
- Rubidium cyanideRubidium cyanide (chemical formula: RbCN) is the rubidium salt of hydrogen cyanide. It is
- Rubidium hydroxideRubidium hydroxide is the inorganic compound with the formula RbOH. It consists of rubidiu
- Rubidium iodideRubidium iodide is a salt of rubidium and iodine, with the chemical formula RbI. It is a w
- Rubidium oxideRubidium oxide is the chemical compound with the formula Rb2O. Rubidium oxide is highly re
- Rubidium perchlorateRubidium perchlorate, RbClO4, is the perchlorate of rubidium. It is an oxidizing agent, as
- Rubidium peroxideRubidium peroxide is rubidium's peroxide with the chemical formula Rb2O2.
- Rubidium-82Rubidium-82 (82Rb) is a radioactive isotope of rubidium. 82Rb is widely used in myocardial
- Rudolf HoppeGerman chemist (1922–2014)
- Russian Chapel in DarmstadtThe Russian Chapel in Darmstadt, formally, the St. Mary Magdalene Chapel, is a historic Ru
- RustType of iron oxide
- RutheniumChemical element with atomic number 44 (Ru)
- Ruthenium(III) chlorideRuthenium(III) chloride is the chemical compound with the formula RuCl3. "Ruthenium(III) c
- RuthenoceneRuthenocene is an organoruthenium compound with the formula (C5H5)2Ru. This pale yellow, v
- RutherfordiumChemical element with atomic number 104 (Rf)
