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- Obed Simon JohnsonObed Simon Johnson (May 5, 1881 – October 12, 1970) was an American academic, chaplain, co
- Octahedral molecular geometryMolecular geometry
- OctaneHydrocarbon compound with the formula C8H18
- Octane ratingStandard measure of the performance of an engine or aviation fuel
- OctanolOctanols are alcohols with the formula C8H17OH. A simple and important member is 1-octanol
- OctaoxygenOctaoxygen, also known as ε-oxygen or red oxygen, is an allotrope of oxygen consisting of
- OctasulfurChemical compound
- Octet ruleChemical rule of thumb
- OctopineOctopine is a derivative of the amino acids arginine and alanine. It was the first member
- Odd HasselNorwegian physical chemist and Nobel Laureate (1897–1981)
- OganessonChemical element with atomic number 118 (Og)
- OilViscous water-insoluble liquid
- Olavi ErämetsäFinnish chemist and professor
- Olefin fiberSynthetic fiber made from a polyolefin
- Olefin metathesisOrganic reaction involving the breakup and reassembly of alkene double bonds
- OleochemistryStudy of vegetable oils and animal oils and fats
- OleumCorrosive liquid of excess sulfur trioxide in solution
- Oleyl alcoholOleyl alcohol , or cis-9-octadecen-1-ol, is an unsaturated fatty alcohol with the molecula
- OligomerMolecule composed of copies of a small unit
- One-pot synthesisChemical synthesis strategy
- Open-chain compoundType of organic molecule with a linear structure
- Open-hearth furnaceIndustrial furnace for steelmaking
- Operating expenseOngoing cost for running a product, business, or system
- Optical properties of carbon nanotubesThe optical properties of carbon nanotubes are highly relevant for materials science. The
- Optical rotationRotation of the plane of linearly polarized light as it travels through a chiral material
- Orbital hybridisationMixing (superposition) of atomic orbitals
- Organic acidOrganic compound with acidic properties
- Organic chemistrySubdiscipline of chemistry, focusing on carbon compounds
- Organic compoundCarbon-containing chemical compound
- Organic photochemistryOrganic photochemistry encompasses organic reactions that are induced by the action of lig
- Organic reactionChemical reactions involving organic compounds
- Organic redox reactionRedox reaction that takes place with organic compounds
- Organic synthesisChemical construction of organic compounds
- Organoaluminium chemistryOrganoaluminium chemistry is the study of compounds containing bonds between carbon and al
- Organoarsenic chemistryChemistry of organic compounds with arsenic–carbon bond
- Organocadmium chemistryOrganocadmium chemistry describes the physical properties, synthesis, reactions, and use o
- Organochlorine chemistryOrganic compound containing at least one covalent carbon-chlorine bond
- Organocopper chemistryCompound with carbon to copper bonds
- Organoiodine chemistryOrganic compound containing at least one covalent carbon-iodine bond
- Organoiron chemistryChemistry of iron compounds containing a carbon-to-iron chemical bond
- Organolead chemistryOrganolead chemistry is the scientific study of the synthesis and properties of organolead
- Organolithium chemistryScience of organolithium compounds
- Organolithium reagentChemical compounds containing C–Li bonds
- Organomercury chemistryGroup of chemical compounds containing mercury
- Organometallic chemistryStudy of organic compounds containing metal(s)
- Organonickel chemistryBranch of organometallic chemistry
- Organopalladium chemistryOrganopalladium chemistry is a branch of organometallic chemistry that deals with organic
- OrganophosphateOrganic compounds with the structure O=P(OR)3
- Organophosphorus chemistryOrganic compound with at least one covalent carbon–phosphorus bond
- Organoselenium chemistryStudy of chemical compounds containing carbon-selenium bonds
- Organosilicon chemistryOrganometallic compound containing carbon–silicon bonds
- OrganosulfateIn organosulfur chemistry, organosulfates are a class of organic compounds sharing a commo
- Organosulfur chemistryOrganic compounds that contain sulfur
- Organothorium chemistryOrganothorium chemistry describes the synthesis and properties of organothorium compounds,
- OsmiumChemical element with atomic number 76 (Os)
- Osmium tetroxideChemical compound
- OsmoceneOsmocene is an organoosmium compound found as a white solid. It is a metallocene with the
- Osmotic diureticAn osmotic diuretic is a type of diuretic that inhibits reabsorption of water and sodium (
- Osmotic pressureMeasure of the tendency of a solution to take in pure solvent by osmosis
- Ostwald processChemical process for producing nitric acid
- Otto DielsGerman chemist (1876–1954)
- Otto FolinSwedish-born American chemist
- Otto WallachGerman chemist (1847–1931)
- OxalateAny derivative of oxalic acid; chemical compound containing oxalate moiety
- Oxalic acidSimplest dicarboxylic acid. (COOH)2
- OxazoleOxazole is the parent compound for a vast class of heterocyclic aromatic organic compounds
- Oxidation stateHypothetical charge of an atom if all its bonds to different atoms were fully ionic
- OxideChemical compound with an oxygen atom
- Oxidizing agentChemical compound used to oxidize another substance in a chemical reaction
- OxocarbonChemical compounds made of only carbon and oxygen
- Oxonium ionCation containing an oxygen atom with 3 bonds and 1+ formal charge
- OxyacidAcid that contains oxygen
- OxyanionNegatively charged polyatomic ion containing oxygen
- OxygenChemical element with atomic number 8 (O)
- Oxygen difluorideChemical compound
- OzoneTriatomic oxygen molecule
- OzonolysisIn organic chemistry, ozonolysis is an organic reaction where the unsaturated bonds are cl
