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- Ian HeilbronScottish chemist (1886–1959)
- IceFrozen water; the solid state of water
- Ice crystalWater ice in symmetrical shapes
- Ideal solutionSolution exhibiting thermodynamic properties analogous to an ideal gas
- IG FarbenFormer German chemicals conglomerate
- IgnitronAn ignitron is a type of gas-filled tube used as a controlled rectifier and dating from th
- ImidazoleChemical compound
- ImideClass of chemical compounds
- ImineOrganic compound or functional group containing a C=N bond
- IminiumPolyatomic ion of the form >C=N< and charge +1
- Imino acidOrganic compound
- Immediately dangerous to life or healthExposure to dangerous levels of airborne contaminants
- Indigenous peoples of South AmericaIn South America, Indigenous peoples comprise the Pre-Columbian peoples and their descenda
- Indirect calorimetryIndirect calorimetry calculates heat that living organisms produce by measuring either the
- IndiumChemical element with atomic number 49 (In)
- Indium chalcogenidesThe indium chalcogenides include all compounds of indium with the chalcogen elements, oxyg
- Indium halidesThere are three sets of Indium halides, the trihalides, the monohalides, and several inter
- Indium tin oxideIndium tin oxide (ITO) is a ternary composition of indium, tin and oxygen in varying propo
- Indium-111Indium-111 (111In) is a radioactive isotope of indium (In). It decays by electron capture
- Indium(III) sulfideIndium(III) sulfide (Indium sesquisulfide, Indium sulfide (2:3), Indium (3+) sulfide) is t
- Indole alkaloidClass of alkaloids
- Inductive effectPermanent bond dipole due to electron-rich or -poor groups in a molecule
- Industrial catalystsCatalysts used in industry
- Industrial control systemProcess control systems and associated instrumentation
- Industrial gasGaseous materials produced for use in industry
- Industrial processesProcess of producing goods
- Industrial water treatmentThere are many uses of water in industry and, in most cases, the used water also needs tre
- Inert gasGas which does not chemically react under the specified conditions
- Infrared spectroscopyMeasurement of infrared radiation's interaction with matter
- Inga Fischer-HjalmarsSwedish physicist, chemist, and humanist
- Inhalational anestheticVolatile or gaseous anesthetic compound delivered by inhalation
- Inherent chiralityIn chemistry, inherent chirality is a property of asymmetry in molecules arising, not from
- Initiation (chemistry)Chemical reaction that triggers one or more secondary reactions
- Inorganic chemistryField of chemistry
- Inorganic Chemistry (journal)Inorganic Chemistry is a biweekly peer-reviewed scientific journal published by the Americ
- Inorganic compoundChemical compound without any carbon-hydrogen bonds
- Inorganic imideThe inorganic imide is an inorganic chemical compound containing
- Inorganic peroxideInorganic compounds with peroxide (O2) ions/groups
- Inorganic polymerIn polymer chemistry, an inorganic polymer is a polymer with a skeletal structure that doe
- Inorganic SynthesesAcademic journal
- Insertion reactionChemical reaction in which one entity is inserted between bonded parts of another
- Instrumental chemistryStudy of analytes using scientific instruments
- Instrumentation in petrochemical industriesInstrumentation is used to monitor and control the process plant in the oil, gas and petro
- Intercalation (biochemistry)Insertion of molecules between DNA
- Intercalation (chemistry)Reversible insertion of an ion into a material with layered structure
- Interface and colloid scienceBranch of chemistry and physics
- Intergranular corrosionWhen crystallite boundaries are more corrosive than their interiors
- InterhalogenMolecule containing only halogen elements of two or more kinds
- Interim CommitteeThe Interim Committee was a secret high-level group created in May 1945 by United States S
- IntermetallicType of metallic alloy
- Intermolecular forceForce of attraction or repulsion between molecules and neighboring particles
- Internal standardChemical analysis method
- International Chemical IdentifierIdentifier for chemical substances
- International Numbering System for Food AdditivesNaming system for food additives
- International Temperature Scale of 1990Practical temperature scale
- International Year of ChemistryYear-long commemorative event
- Interstitial defectCrystallographic defect of atoms within gaps in a lattice
- Intramolecular Diels–Alder cycloadditionReaction in organic chemistry
- Intramolecular forceType of atomic bonding
- Intramolecular Heck reactionChemical reaction to produce organic compounds
- Intramolecular reactionProcess or characteristic limited to the structure of a single molecule
- Inverse electron-demand Diels–Alder reactionReaction impacting chemical bonds
- IodatePolyatomic anion (IO3) with charge -1
- IodideIon, and compounds containing the ion
- IodineChemical element with atomic number 53 (I)
- Iodine azideIodine azide (IN3) is an explosive inorganic compound, which in ordinary conditions is a y
- Iodine clock reactionExperiment to show chemical kinetics in action
- Iodine compoundsChemical compounds containing iodine
- Iodine deficiencyMedical condition
- Iodine in biologyIodine is an essential trace element in biological systems. It has the distinction of bein
- Iodine monochlorideIodine monochloride is an interhalogen compound with the formula ICl. It is a red-brown ch
- Iodine-129Radioisotope of iodine
- Iodine–starch testMethod to detect presence of polysaccharides
- IodoformChemical compound
- IodolactonizationChemical reaction
- Ion associationIn chemistry, ion association is a chemical reaction whereby ions of opposite electric cha
- Ion chromatographyLaboratory technique to separate ions and polar molecules
- Ion exchangeExchange of ions between an electrolyte solution and a solid
- Ion-exchange resinOrganic polymer matrix bearing ion-exchange functional groups
- Ionic bondingChemical bonding involving attraction between ions
- Ionic liquidSalt in the liquid state
- Ionic radiusRadius of an atomic ion in crystals
- Ionic strengthQuantification of the electrical interactions between ions in solution
- Ionization chamberGas-filled radiation detector
- Ionization energies of the elements (data page)List of energies required to remove successive electrons from each atom
- Ionization energyEnergy needed to remove an electron
- IontophoresisIontophoresis is a process of transdermal drug delivery by use of a voltage gradient on th
- IridiumChemical element with atomic number 77 (Ir)
- Iridium compoundsIridium compounds are compounds containing the element iridium (Ir). Iridium forms compoun
- Iridium tetroxideIridium tetroxide (IrO4, Iridium(VIII) oxide) is a binary compound of oxygen and iridium i
- IronChemical element with atomic number 26 (Fe)
- Iron compoundsChemical compounds containing iron
- Iron in biologyIron is an important biological element. It is used in both the ubiquitous iron-sulfur pro
- Iron nanoparticleSub-micrometer iron particles
- Iron oxideClass of chemical compounds composed of iron and oxygen
- Iron oxide nanoparticleIron oxide particles with diameters between about 1 and 100 nanometers
- Iron tetrafluorideIron tetrafluoride is a binary inorganic compound with a chemical formula of FeF4.
- Iron–platinum nanoparticleNanomaterial
- Iron–sulfur clusterInorganic cofactor
- Iron–sulfur proteinProteins containing iron-sulfur clusters
- Iron(II,III) oxideChemical compound
- Iron(II) oxideInorganic compound with the formula FeO
- Iron(II) sulfateChemical compound
- Iron(II) sulfideChemical compound
- Iron(III) bromideIron(III) bromide is the chemical compound with the formula FeBr3. Also known as ferric br
- Iron(III) chlorideInorganic compound of Iron
- Iron(III) citrateChemical compound
- Iron(III) oxideChemical compound
- Iron(III) sulfateChemical compound
- Isabelle StengersIsabelle Stengers (; French: ; born 1949) is a Belgian philosopher, noted for her work in
- IsobutaneIsomer/derivative of butane
- IsocyanateChemical group (–N=C=O)
- IsocyanideChemical compound with the group –N+≡C–
- Isoelectric pointpH at which a molecule carries no net electric charge
- IsoelectronicityIdentical electron configuration
- IsoflavoneClass of chemical compounds
- IsoflavonoidIsoflavonoids are a class of flavonoid phenolic compounds, many of which are biologically
- Isolobal principleMethod of predicting the bonding properties of certain organometallic compounds
- IsomerChemical compounds with the same molecular formula but different atomic arrangements
- IsomerizationTransformation of the chemical structure of a molecule or ion
- Isomorphism (crystallography)Similarity of symmetry and shape
- IsopreneBio-organic compound that serves as the building unit of terpenes
- Isopropyl alcoholSimplest secondary alcohol
- IsothiocyanateChemical group (–N=C=S)
- Isotope dilutionMethod of determining the quantity of chemical substances
- Isotopes of argonArgon (18Ar) has 26 known isotopes, from 29Ar to 54Ar, of which three are stable (36Ar, 38
- Isotopes of bariumNaturally occurring barium (56Ba) is a mix of six stable isotopes and one very long-lived
- Isotopes of caesiumCaesium (55Cs) has 41 known isotopes, ranging in mass number from 112 to 152. Only one iso
- Isotopes of calciumCalcium (20Ca) has 26 known isotopes, ranging from 35Ca to 60Ca. There are five stable iso
- Isotopes of carbonCarbon (6C) has 14 known isotopes, from 8C to 20C as well as 22C, of which only 12C and 13
- Isotopes of chlorineChlorine (17Cl) has 25 isotopes, ranging from 28Cl to 52Cl, and two isomers, 34mCl and 38m
- Isotopes of cobaltNaturally occurring cobalt, Co, consists of a single stable isotope, 59Co (thus, cobalt is
- Isotopes of heliumHelium (2He) has nine known isotopes, but only helium-3 (3He) and helium-4 (4He) are stabl
- Isotopes of hydrogenHydrogen (1H) has three naturally occurring isotopes: 1H, 2H, and 3H. 1H and 2H are stable
- Isotopes of iridiumThere are two natural isotopes of iridium (77Ir), 191Ir and 193Ir, both stable. In additio
- Isotopes of ironNatural iron (26Fe) consists of four stable isotopes: 5.85% 54Fe, 91.75% 56Fe, 2.12% 57Fe
- Isotopes of leadLead (82Pb) has four observationally stable isotopes: 204Pb, 206Pb, 207Pb, 208Pb. Lead-204
- Isotopes of magnesiumMagnesium (12Mg) naturally occurs in three stable isotopes: 24Mg, 25Mg, and 26Mg. There ar
- Isotopes of nickelNaturally occurring nickel (28Ni) consists of five stable isotopes; 58Ni, 60Ni, 61Ni, 62Ni
- Isotopes of nitrogenNatural nitrogen (7N) consists of two stable isotopes: the vast majority (99.62%) of natur
- Isotopes of oxygenThere are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioisotopes are
- Isotopes of plutoniumPlutonium (94Pu) is an artificial element, except for trace quantities resulting from neut
- Isotopes of potassiumPotassium (19K) has 25 known isotopes from 34K to 57K as well as 31K, as well as an unconf
- Isotopes of protactiniumProtactinium (91Pa) has no stable isotopes. As 231Pa occurs in usable quantity, and compri
- Isotopes of seleniumSelenium (34Se) has six natural isotopes that occur in significant quantities, along with
- Isotopes of thoriumThorium (90Th) has seven naturally occurring isotopes but none are stable. One isotope, 23
- Isotopes of titaniumNaturally occurring titanium (22Ti) is composed of five stable isotopes; 46Ti, 47Ti, 48Ti,
- Isotopes of uraniumUranium (92U) is a naturally occurring radioactive element (radioelement) with no stable i
- Isotopic abundanceRelative proportion of an isotope as found in nature
- Isotopic labelingChemical and biochemical technique to follow reactions through using atomic isotopes
- Isotopic shiftMass effects on spectroscopy
- Isovalent hybridizationIn chemistry, isovalent or second order hybridization is an extension of orbital hybridiza
- IUPAC Inorganic Chemistry DivisionThe Inorganic Chemistry Division of the International Union of Pure and Applied Chemistry
- IUPAC nomenclature of chemistrySystematic rules for naming chemical compounds and chemistry concepts
- IUPAC nomenclature of inorganic chemistrySystematic method of naming inorganic chemical compounds
- IUPAC nomenclature of inorganic chemistry 20052005 edition of the Nomenclature of Inorganic Chemistry
- IUPAC nomenclature of organic chemistrySystem for naming organic chemical compounds
- IUPAC numerical multiplierValue in chemical nomenclature
- Ivanov reactionChemical reaction
