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- Haber processIndustrial process for ammonia production
- Haber–Weiss reactionChemical reaction
- HafniumChemical element with atomic number 72 (Hf)
- Hafnium compoundsAny chemical compound having at least one atom of hafnium
- Hafnium(IV) oxideChemical compound
- HalazoneHalazone (4-(dichlorosulfamoyl)benzoic acid) is a chemical compound whose formula can be w
- Half-cellStructure in electrochemistry
- Half-reactionRedox reaction component
- HalicinHalicin (SU-3327) is an experimental drug that acts as an enzyme inhibitor of c-Jun N-term
- HalideChemical compound composed of a halogen atom and some other element
- Hall–Héroult processAluminium smelting process
- HaloalkaneGroup of chemical compounds derived from alkanes containing one or more halogens
- HalocarbonChemical compound containing carbon and at least one halogen
- Haloform reactionChemical reaction involving repeated halogenation of an acetyl group (–COCH3)
- HalogenGroup of chemical elements
- Halogen addition reactionReaction which adds a halogen molecule
- Halogen bondNet attractive interaction involving one of the halogen elements
- Halogenated etherSubcategory of ether used in anesthesiology
- HalogenationChemical reaction which adds one or more halogen elements to a compound
- HalohydrinType of functional group in a molecule
- HalomethaneHalogen compounds derived from methane
- Halous acidA halous acid, also known as a halogenous acid, is an oxyacid consisting of a halogen atom
- Hammett acidity functionMeasure of acidity for very strong acids
- Hammett equationFree-energy relationship in organic chemistry
- Hammond's postulateHypothesis in physical organic chemistry
- Hans FischerGerman chemist (1881–1945)
- Hans FreemanAustralian chemist (1929–2008)
- Hans Heinrich LandoltHans Heinrich Landolt (5 December 1831 – 15 March 1910) was a Swiss chemist who discovered
- Hans MeerweinGerman chemist (1879–1965)
- Hans von Euler-ChelpinSwedish scientist (1873–1964)
- Hantzsch pyrrole synthesisChemical reaction
- HapticityCoordination of a ligand to a central atom
- Hard waterWater that has a high mineral content
- Harold S. JohnstonAmerican chemist (1920–2012)
- Harry CooverAmerican inventor of Super Glue
- Harry KrotoEnglish chemist (1939–2016)
- Harry RicardoSir Harry Ralph Ricardo (26 January 1885 – 18 May 1974) was an English engineer who was on
- Hartree–Fock methodApproximation method in quantum physics
- HassiumChemical element with atomic number 108 (Hs)
- Hazard symbolWarning symbol on locations or products
- Hazardous Materials Identification SystemNumerical hazard rating using colour coded labels
- Hazardous Materials Transportation ActThe Hazardous Materials Transportation Act (HMTA), enacted in 1975, is the principal feder
- Headspace gas chromatographyChromatography process
- Health Hazard Evaluation ProgramThe Health Hazard Evaluation (HHE) program is a workplace health program administered by t
- Heat of combustionAmount of heat released by combustion of a quantity of substance
- Heavy metalsTerm used for certain metallic elements
- Heavy mineral sands ore depositsHeavy mineral sands are a class of ore deposit which is an important source of zirconium,
- Heavy waterForm of water
- Heck reactionCoupling reaction
- Heinrich Otto WielandGerman Nobel laureate in Chemistry (1877–1957)
- Heinrich RoseHeinrich Rose (6 August 1795 – 27 January 1864) was a German mineralogist and analytical c
- Heinz GerischerGerman chemist (1919–1994)
- Helen Murray FreeAmerican chemist and educator (1923–2021)
- HeliceneIn organic chemistry, helicenes are ortho-condensed polycyclic aromatic compounds in which
- HeliumChemical element with atomic number 2 (He)
- Helium atomAtom of helium
- Helium compoundsClass of extreme chemical compounds
- Helium trimerThe helium trimer (or trihelium) is a weakly bound molecule consisting of three helium ato
- Helium-3Helium isotope with two protons and one neutron
- Helium-4Isotope of helium
- Hell–Volhard–Zelinsky halogenationChemical reaction
- HemiacetalOrganic compound of the form >C(OH)O–
- HemicelluloseClass of plant cell wall polysaccharides
- Henderson–Hasselbalch equationEquation used to estimate pH of a weak acid or base solution
- Henry Edward ArmstrongHenry Edward Armstrong FRS FRSE (Hon) (6 May 1848 – 13 July 1937) was a British chemist. A
- Henry GilmanHenry Gilman ForMemRS (May 9, 1893 – November 7, 1986) was an American organic chemist kno
- Henry Louis Le ChatelierFrench chemist (1850–1936)
- Henry MoseleyEnglish physicist (1887–1915)
- Henry reactionChemical reaction
- Henry's lawGas law regarding proportionality of dissolved gas
- HeptaceneHeptacene is an organic compound and a polycyclic aromatic hydrocarbon and the seventh mem
- Herbert FreundlichHerbert Max Finlay Freundlich ForMemRS (28 January 1880 in Charlottenburg – 30 March 1941
- Herman FraschHerman Frasch [or Hermann Frasch] (December 25, 1851 – May 1, 1914) was a chemist, mining
- Hermann KolbeGerman chemist (1818–1884)
- Hess's lawThermodynamic law in chemistry
- Heterocyclic amineAny heterocyclic compound having at least one nitrogen heteroatom
- Heterocyclic compoundMolecule with one or more rings composed of different elements
- Heterogeneous catalysisType of catalysis involving reactants & catalysts in different phases of matter
- Heterolysis (chemistry)Breaking a molecular bond such that both electrons remain with one species
- HeteropolyoxometalateIon with many transition metals
- HexaceneHexacene is an aromatic compound consisting of six linearly-fused benzene rings. It is a b
- HexachlorobutadieneHexachlorobutadiene, (often abbreviated as "HCBD") Cl2C=C(Cl)C(Cl)=CCl2, is a colorless li
- HexafluorideIndex of chemical compounds with the same name
- HexafluoroacetylacetoneHexafluoroacetylacetone is the chemical compound with the nominal formula CF3C(O)CH2C(O)CF
- Hexagonal latticeOne of the five 2D Bravais lattices
- HexaneChemical compound (C6H14)
- Hexane (data page)This page provides supplementary chemical data on n-hexane.
- HexanitrobenzeneHexanitrobenzene, also known as HNB, is a nitrobenzene compound in which six nitro groups
- HexazineHexazine (also known as hexaazabenzene) is a hypothetical allotrope of nitrogen composed o
- Hexose6-carbon simple sugar
- Hierarchical editing language for macromoleculesNotation for describing complex biological molecules
- High production volume chemicalsHigh production volume chemicals (HPV chemicals) are produced or imported into the United
- High-performance liquid chromatographyTechnique in analytical chemistry
- High-performance thin-layer chromatographyAdvanced technique to separate non-volatile substances
- High-speed steelSubset of tool steels
- High-valent ironHigh-valent iron commonly denotes compounds and intermediates in which iron is found in a
- History of chemical warfareHistory of chemical weapons in war
- History of gasolineThe history of gasoline started around the invention of internal combustion engines suitab
- History of molecular theoryIn chemistry, the history of molecular theory traces the origins of the concept or idea of
- History of poisonThe history of poison stretches from before 4500 BCE to the present day. Poisons have been
- History of the Haber processThe history of the Haber process begins with the invention of the Haber process at the daw
- Hiyama couplingChemical reaction
- Hofmann eliminationChemical reaction in organic chemistry
- Hofmann rearrangementType of chemical reaction
- Hofmann–Löffler reactionChemical reaction
- HolmiumChemical element with atomic number 67 (Ho)
- Holographic gratingIn optics, a holographic grating is a type of diffraction grating formed by an interferenc
- Holographic sensorA holographic sensor is a device that comprises a hologram embedded in a smart material th
- HOMO and LUMOHighest occupied and lowest unoccupied molecular (frontier) orbitals
- HomoaromaticityOrganic molecular structure
- HomochiralityUniformity of handedness
- Homogeneity and heterogeneityConcept of uniform or non-uniform in an object's composition or attributes
- Homogeneous catalysisChemical reaction where catalyst and reactants are in the same phase of matter
- Homogenization (chemistry)Chemical process
- Homologous seriesSequence of organic compounds with similar chemical properties
- HomotaurineHomotaurine (also known as tramiprosate (INN), 3-amino-1-propanesulfonic acid, or 3-APS) i
- HoneycombCollection of wax cells built by honeybees
- HormesisCharacteristic of biological processes
- Horner–Wadsworth–Emmons reactionVariation on the Wittig chemical reaction
- Horst KesslerGerman chemist
- Host–guest chemistrySupramolecular structures held together other than by covalent bonds
- Hot-dip galvanizationProcess of coating iron or steel with molten zinc
- Household chemicalsChemicals common in an average household
- Household hazardous wasteHousehold hazardous waste (HHW) was a term coined by Dave Galvin from Seattle, Washington
- HSAB theoryChemical theory about acids and bases
- Hückel's ruleMethod of determining aromaticity in organic molecules
- HumectantA humectant is a hygroscopic (water-absorbing) substance used to keep things moist. They a
- HumuleneNaturally occurring monocyclic sesquiterpene
- HumuloneHumulone (α-lupulic acid), a vinylogous type of organic acid, is a bitter-tasting chemical
- Hunsdiecker reactionNamed reaction for synthesis of organic halides
- Hunter processIndustrial process producing titanium
- Huntington Museum of ArtThe Huntington Museum of Art is a nationally accredited art museum located in the Park Hil
- HydrateSubstance containing water or its constituent elements
- Hydration reactionChemical reaction in which a substance combines with water
- HydrazineColorless flammable liquid with an ammonia-like odor
- HydrazinesClass of chemical compounds
- Hydrazoic acidUnstable and toxic chemical compound
- Hydrazone iodinationChemical reaction
- HydrideMolecule with a hydrogen bound to a more electropositive element or group
- HydroaminationAddition of an N–H group across a C=C or C≡C bond
- HydroborationAddition of a hydrogen-boron bond to C=C, C=N, C=O, or C≡C bonds
- Hydroboration–oxidation reactionChemical reaction that converts an alkene to an alcohol
- Hydrobromic acidAqueous solution of hydrogen bromide
- HydrocarbonOrganic compound consisting entirely of hydrogen and carbon
- Hydrochloric acidAqueous solution of hydrogen chloride
- HydrocyanationChemical process of converting alkenes to nitriles
- HydrodesulfurizationChemical process used to remove sulfur in natural gas and oil refining
- Hydrofluoric acidSolution of hydrogen fluoride in water
- HydrofluorocarbonSynthetic organic compounds
- HydroformylationChemical process for converting alkenes to aldehydes
- HydrogenChemical element with atomic number 1 (H)
- Hydrogen anionNegative ion of hydrogen
- Hydrogen astatideChemical compound
- Hydrogen atomAtom of the element hydrogen
- Hydrogen bondIntermolecular attraction between a hydrogen donor-and-acceptor pair
- Hydrogen bromideChemical compound
- Hydrogen chalcogenideChemical compound with hydrogen and chalcogen atoms
- Hydrogen chlorideChemical compound
- Hydrogen compoundsCompounds containing hydrogen
- Hydrogen cyanideChemical compound
- Hydrogen evolution reactionChemical reaction
- Hydrogen fluorideChemical compound
- Hydrogen halideChemical compound consisting of hydrogen bonded to a halogen element
- Hydrogen iodideChemical substance
- Hydrogen peroxideChemical compound
- Hydrogen selenideChemical compound
- Hydrogen sulfidePoisonous and flammable gas
- Hydrogen tellurideChemical compound
- Hydrogen thioperoxideHydrogen thioperoxide, also called oxadisulfane or sulfanol, is the chemical with the stru
- Hydrogen-terminated silicon surfaceHydrogen-terminated silicon surface is a chemically passivated silicon substrate where the
- Hydrogen–deuterium exchangeChemical reaction
- Hydrogenase mimicA hydrogenase mimic or bio-mimetic is an enzyme mimic of hydrogenases.
- HydrogenationChemical reaction between molecular hydrogen and another compound or element
- Hydrogenation of carbon–nitrogen double bondsIn chemistry, the hydrogenation of carbon–nitrogen double bonds is the addition of the ele
- HydrogenolysisChemical reaction in which a C–C or C–R bond is cleaved by hydrogen
- HydrogenoxalateIon
- HydrohalogenationElectrophilic addition of hydrogen halides to alkenes
- Hydroiodic acidHydroiodic acid (or hydriodic acid) is a colorless liquid. It is an aqueous solution of hy
- HydrolysisCleavage of chemical bonds by the addition of water
- Hydrolysis constantThe word hydrolysis is applied to chemical reactions in which a substance reacts with wate
- HydrometallurgyOre extraction process
- HydronMonocationic atomic hydrogen, H+
- HydroniumAqueous cation H3O+
- Hydronium perchlorateHydronium perchlorate is an inorganic chemical compound with the chemical formula [H3O]ClO
- HydroperoxideClass of chemical compounds
- HydrophileMolecular entity that is attracted to water
- HydrophobeMolecule or surface that has no attraction to water
- HydrosilylationAddition of Si-H bonds across unsaturated bonds
- HydroxideChemical compound (OH–)
- Hydroxy groupChemical group (–OH)
- Hydroxyl radicalNeutral form of the hydroxide ion
- HydroxylamineInorganic compound
- HydroxylationChemical reaction which adds an –OH group to an organic compound
- HydroxymethylationChemical reaction
- HydroxyquinolHydroxyquinol is an organic compound with the formula C6H3(OH)3. It is one of three isomer
- Hyeon TaeghwanSouth Korean chemist (born 1964)
- HygroscopyPhenomenon of attracting and holding water molecules
- HyperconjugationConcept in organic chemistry
- Hypervalent moleculeMolecule containing main group elements with more than eight valence electrons
- Hypervalent organoiodine compoundsOrganic derivative of iodine
- HypochloriteAnion
- Hypochlorous acidChemical compound
- HypomanganateIn chemistry, hypomanganate, also called manganate(V) or tetraoxidomanganate(3−), is a tri
- Hypothetical chemical compoundChemical compound whose existence is predicted, but not confirmed
- HypothiocyaniteChemical compound
