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- P-Cymenep-Cymene is a naturally occurring aromatic organic compound. It is classified as an alkylb
- P-wave modulusThere are two kinds of seismic body waves in solids, pressure waves (P-waves) and shear wa
- P450-containing systemsAny enzyme system that includes cytochrome P450 protein or domain can be called a P450-con
- PaclitaxelMedication used for cancer
- Pair potentialIn physics, a pair potential is a function that describes the potential energy of two inte
- PalladacyclePalladacycle, as a class of metallacycles, refers to complexes containing at least one car
- PalladiumChemical element with atomic number 46 (Pd)
- PallasiteThe pallasites are a class of stony–iron meteorite. They are relatively rare, and can be d
- Panacea (medicine)Supposed universal remedy
- Pancreatic lipaseDigestive enzyme found in humans
- Pancreatic lipase familyTriglyceride lipases (EC 3.1.1.3) are a family of lipolytic enzymes that hydrolyse ester l
- PapaverinePapaverine (Latin papaver, "poppy") is an opium alkaloid antispasmodic drug, used primaril
- Paper chromatographySeparation of chemicals, often colored, on paper
- Paper millFactory that produces paper
- Paraffin waxSoft colorless solid derived from petroleum, coal or shale oil
- ParaformaldehydeParaformaldehyde (PFA) is the smallest polyoxymethylene, the polymerization product of for
- Parent hydrideMolecule made of a main-group element bound to hydrogen
- Partial chargeIn atomic physics, a partial charge (or net atomic charge) is a non-integer charge value w
- Partition coefficientRatio of concentrations in a mixture at equilibrium
- Passivation (chemistry)Physico-chemical processes contributing to protect a surface against oxidation
- PatinaChange of object's surface through age and exposure
- Paul D. BoyerAmerican biochemist
- Paul Doughty BartlettPaul Doughty Bartlett (August 14, 1907 – October 11, 1997) was an American chemist.
- Paul G. GassmanAmerican chemist
- Paul KarrerSwiss organic chemist (1889–1971)
- Paul Sabatier (chemist)French chemist (1854–1941)
- PearliteLamellar structure of ferrite and cementite
- Pearson symbolMeans of describing a crystal structure
- PeerJPeerJ is an open access peer-reviewed scientific mega journal covering research in the bio
- Pekka PyykköVeli Pekka Pyykkö (born 12 October 1941) is a Finnish academic. He was professor of Chemis
- Pendant groupGroup of atoms attached to a long molecule's backbone chain
- Pentakis dodecahedronIn geometry, a pentakis dodecahedron or kisdodecahedron is a polyhedron created by attachi
- PentalenePentalene is a polycyclic hydrocarbon composed of two fused cyclopentadiene rings. It has
- Pentamagnesium digallidePentamagnesium digallide, also known as magnesium gallide(−V), is a chemical compound in t
- Peptide synthesisProduction of peptides
- PerchlorateIon, and compounds containing the ion
- Perchloric acidChemical compound
- Pericyclic reactionReaction with a cyclic transition state
- Period (periodic table)Method of visualizing the relationship between elements
- Period 1 elementElement in first row of periodic table
- Period 2 elementAny of the chemical elements in the second row of the periodic table
- Period 3 elementThird row of the periodic table
- Period 4 elementFourth row in the periodic table of chemical elements
- Period 5 elementFifth row of the periodic table
- Period 6 elementRow 6 of the periodic table
- Period 7 elementAny element in row 7 of the periodic table
- Periodic tableTabular arrangement of the chemical elements
- Periodic table (crystal structure)Crystalline structure for solid elements
- Periodic trendsSpecific recurring patterns that are present in the modern periodic table
- Perkin TransactionsPerkin Transactions is a scientific journal devoted to organic chemistry published from 19
- PermanganateChemical compound
- PermeationPenetration of a liquid, gas, or vapor through a solid
- PeroxideChemical compounds with the structure R–O–O–R'
- Peroxy acidOrganic acid with an –OOH group
- PersulfideIn chemistry, persulfide refers to the functional group R-S-S-H. Persulfides are intermedi
- Peter AgreAmerican physician and academic (born 1949)
- Peter DownesBritish biochemist
- Petroleum jellyChemical substance used as a lubricating agent and topical ointment
- Petroleum naphthaPetroleum product
- Petrus Jacobus KippDutch apothecary, chemist and instrument maker
- PewterAlloy primarily of tin, used for metalware
- PFASClass of perfluorinated chemical compounds
- PHMeasure of the level of acidity or basicity of an aqueous solution
- PH indicatorChemical added to show pH of a solution
- PH meterA pH meter is a scientific instrument that measures the hydrogen-ion activity in water-bas
- Pharmaceutical formulationProcess for producing a final medicinal product
- PharmacophoreIn medicinal chemistry and molecular biology, a pharmacophore is an abstract description o
- Phase diagramChart used to show conditions at which physical phases of a substance occur
- Phase separationCreation of two phases of matter from a single homogenous mixture
- Phase-transfer catalystSubstance which facilitates the phase transition of a reactant
- PhenolChemical compound
- Phenol formaldehyde resinChemical compound
- Phenolic acidPhenolic acids or phenolcarboxylic acids are phenolic compounds and types of aromatic acid
- PhenolphthaleinpH indicator that turns pink in basic solution
- PhenolsChemical compounds in which hydroxyl group is attached directly to an aromatic ring
- Phenyl groupCyclic chemical group (–C6H5)
- Phenylmagnesium bromidePhenylmagnesium bromide, with the simplified formula C6H5MgBr, is a magnesium-containing o
- PhenylpropanoidAny organic aromatic compound with a structure based on a phenylpropane skeleton
- PhenylsilanePhenylsilane, also known as silylbenzene, a colorless liquid, is one of the simplest organ
- PhosphateAnion, salt, functional group or ester derived from a phosphoric acid
- Phosphate binderPhosphate binders are medications used to reduce the absorption of dietary phosphate; they
- PhosphineChemical compound hydrogen phosphide
- Phosphite (ion)Ion
- Phosphite esterIn organic chemistry, a phosphite ester or organophosphite usually refers to an organophos
- Phosphomolybdic acidPhosphomolybdic acid is the heteropolymetalate with the formula H3[Mo12PO40]·12H2O. It is
- PhosphoniumFamily of polyatomic cations containing phosphorus
- Phosphoric acidChemical compound (PO(OH)3)
- Phosphoric acids and phosphatesClass of chemical species; phosphorus oxoacids and their deprotonated derivatives
- PhosphorusChemical element with atomic number 15 (P)
- Phosphorus pentachloridePhosphorus pentachloride is the chemical compound with the formula PCl5. It is one of the
- Phosphorus pentoxideChemical compound
- Phosphorus-32Radioactive isotope of phosphorus
- PhotochemistrySub-discipline of chemistry
- PhotodegradationAlteration of materials by light
- Photoelectrochemical reduction of carbon dioxidePhotoelectrochemical reduction of carbon dioxide, also known as photoelectrolysis of carbo
- Photoelectrolysis of waterPhotoelectrolysis of water, also known as photoelectrochemical water splitting, occurs in
- Photoemission spectroscopyPhotoemission spectroscopy (PES), also known as photoelectron spectroscopy, refers to ener
- Physical chemistryPhysics applied to chemical systems
- Physical organic chemistryDiscipline of organic chemistry
- PhysisorptionProcess involving electronic structure
- Pi bondType of chemical bond
- Pi helixA pi helix (or π-helix) is a type of secondary structure found in proteins. Discovered by
- PicometreThe picometre (international spelling as used by the International Bureau of Weights and M
- Pietro BiginelliPietro Biginelli (25 July 1860 – 15 January 1937) was an Italian chemist, who discovered a
- Pig ironIron alloy
- Pine tarChemical compound
- PineneOily organic chemical found in plants
- PiperylenePiperylene or 1,3-pentadiene is an organic compound with the formula CH3−CH=CH−CH=CH2. It
- Pittsburgh Conference on Analytical Chemistry and Applied SpectroscopyThe Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, referred to in
- PivalonitrilePivalonitrile is a nitrile with the semi-structural formula (CH3)3CCN, abbreviated t-BuCN.
- Planar chiralityPlanar chirality, also known as 2D chirality, is the special case of chirality for two dim
- Plastic extrusionMelted plastic manufacturing process
- Plastic weldingPlastic welding is welding for semi-finished plastic materials, and is described in ISO 47
- PlasticizerSubstance added to a material to make it softer and more flexible
- PlatinumChemical element with atomic number 78 (Pt)
- Platinum groupSix noble, precious metallic elements clustered together in the periodic table
- Platinum nanoparticlePlatinum nanoparticles are usually in the form of a suspension or colloid of nanoparticles
- Plug flow reactor modelReactor simulation model
- PlumbocenePlumbocene is an organometallic compound of lead with the chemical formula Pb(C5H5)2. It i
- PlutoniumChemical element with atomic number 94 (Pu)
- Plutonium-239Isotope of plutonium
- PMDTAPMDTA (N,N,N′,N′′,N′′-pentamethyldiethylenetriamine) is an organic compound with the formu
- PnictogenGroup 15 elements of the periodic table with valency 5
- Pnictogen hydrideChemical compound with hydrogen and pnictogen atoms
- Point groupGroup of geometric symmetries with at least one fixed point
- PolarimeterInstrument for measuring optical rotation
- PolarizabilityTendency of matter subjected to an electric field to acquire an electric dipole moment
- PolarographyMethod of chemical analysis
- PoloniumChemical element with atomic number 84 (Po)
- Polonium hexafluoridePolonium hexafluoride (PoF6) is a possible chemical compound of polonium and fluorine and
- Polonium hydrideChemical compound
- Polonium trioxidePolonium trioxide (also known as polonium(VI) oxide) is a chemical compound with the formu
- Poly(methyl methacrylate)Transparent thermoplastic, commonly called acrylic
- PolyacrylonitrileChemical compound
- Polyatomic ionIon containing two or more atoms
- PolybutadienePolybutadiene [butadiene rubber, BR] is a synthetic rubber. It offers high elasticity, hig
- PolycarbonateFamily of polymers
- Polychlorinated biphenylHighly toxic chemical compounds
- Polychlorinated dibenzodioxinsClass of environmentally polluting organic compounds
- Polycyclic aromatic hydrocarbonHydrocarbon composed of multiple aromatic rings
- PolyenePolyunsaturated organic compound
- Polyene antimycoticPolyene antimycotics, sometimes referred to as polyene antibiotics, are a class of antimic
- PolyesterCategory of polymers, in which the monomers are joined together by ester links
- PolyethyleneMost common thermoplastic polymer
- Polyethylene glycolChemical compound
- Polyethylene terephthalatePolymer
- PolyisopreneGroup of synthetic polymers, including cis-1,4-polyisoprene
- PolymerSubstance composed of macromolecules with repeating structural units
- Polymer architecturePolymer architecture in polymer science relates to the way branching leads to a deviation
- Polymer backboneLongest chain of covalently-bonded atoms in a polymer
- Polymer characterizationPolymer characterization is the analytical branch of polymer science.
- Polymer chemistryChemistry subdiscipline
- Polymer degradationAlteration in the polymer properties under the influence of environmental factors
- Polymer solutionPolymer solutions are solutions containing dissolved polymers. These may be liquid solutio
- Polymeric foamA polymeric foam is a special foam, in liquid or solidified form, formed from polymers.
- PolymerizationChemical reaction to form polymer chains
- PolyolOrganic compound with multiple –OH groups
- PolyolefinFamily of related polymers
- PolyphenolClass of chemical compounds
- PolypropyleneThermoplastic polymer
- Polypropylene glycolChemical compound
- Polysorbate 80Polysorbate 80 is a nonionic surfactant and emulsifier often used in pharmaceuticals, food
- PolystyrenePolymer resin widely used in packaging
- PolysulfaneClass of chemical compounds
- PolytellurideIn chemistry, a polytelluride usually refers to anions of the formula (Ten)2-. Many main g
- PolytetrafluoroethyleneSynthetic polymer
- PolyurethanePolymer composed of a chain of organic units joined by carbamate (urethane) links
- Polyvalency (chemistry)Property of chemical species that can form multiple bonds
- Polyvinyl acetateAdhesive used for porous materials
- Polyvinyl alcoholChemical compound
- Polyvinyl chlorideCommon synthetic polymer
- Polyvinylidene fluorideThermoplastic fluoropolymer
- PolyyneAny organic compound with alternating C–C and C≡C bonds
- PorphinePorphine or porphin is an organic compound of empirical formula C20H14N4. It is heterocycl
- PorphyrinClass of organic compounds
- Post-mortem chemistrySubdiscipline of chemistry
- Post-transition metalCategory of metallic elements
- PotashSalt mixture
- PotassiumChemical element with atomic number 19 (K)
- Potassium acetateColourless soluble salt of acetic acid
- Potassium alumChemical compound
- Potassium bitartrateChemical salt used in cooking as cream of tartar
- Potassium bromideIonic compound (KBr)
- Potassium carbonateChemical compound
- Potassium chlorateChemical compound
- Potassium chloridePotassium compound and alternative to salt
- Potassium chromateChemical compound
- Potassium citrateChemical compound
- Potassium cyanatePotassium cyanate is an inorganic compound with the formula KOCN (sometimes denoted KCNO).
- Potassium cyanideChemical compound
- Potassium dichromateChemical compound
- Potassium dicyanoargentatePotassium dicyanoargentate is an inorganic compound with the formula KAg(CN)2. A white sol
- Potassium ferratePotassium ferrate is an inorganic compound with the formula K2FeO4. It is the potassium sa
- Potassium ferricyanideChemical compound
- Potassium ferrocyanideChemical compound
- Potassium hydrosulfidePotassium hydrosulfide is an inorganic compound with the formula KSH. This colourless salt
- Potassium hydroxideInorganic compound (KOH)
- Potassium hypomanganatePotassium hypomanganate is the inorganic compound with the formula K3MnO4. Also known as p
- Potassium iodatePotassium iodate (KIO3) is an ionic inorganic compound with the formula KIO3. It is a whit
- Potassium iodideIonic compound (KI)
- Potassium manganateChemical compound
- Potassium nitrateChemical compound
- Potassium octachlorodirhenatePotassium octachlorodirhenate(III) is an inorganic compound with the formula K2Re2Cl8. Thi
- Potassium oxideChemical compound
- Potassium ozonidePotassium ozonide is an oxygen rich compound of potassium. It is an ozonide, meaning it co
- Potassium perchlorateChemical compound
- Potassium periodatePotassium periodate is an inorganic salt with the molecular formula KIO4. It is composed o
- Potassium permanganateChemical compound
- Potassium permanganate (medical use)Potassium permanganate is used as a medication for a number of skin conditions. This inclu
- Potassium peroxideChemical compound
- Potassium perrhenatePotassium perrhenate is an inorganic compound with the chemical formula KReO4.
- Potassium phthalimidePotassium phthalimide is a chemical compound of formula C8H4KNO2. It is the potassium salt
- Potassium selenocyanatePotassium selenocyanate is the inorganic compound with the formula KSeCN. It is a hygrosco
- Potassium sulfateChemical compound
- Potassium sulfideChemical compound
- Potassium superoxideChemical compound
- Potassium tartratePotassium tartrate, dipotassium tartrate or argol has formula K2C4H4O6. It is the potassiu
- Potassium telluridePotassium telluride is an inorganic compound with a chemical formula K2Te. It is formed fr
- Potassium-40Radioactive isotope of potassium
- Potential applications of carbon nanotubesCarbon nanotubes (CNTs) are cylinders of one or more layers of graphene (lattice). Diamete
- PotentiostatA potentiostat is the electronic hardware required to control a three electrode cell and r
- PottageSoupy stew prepared in a pot
- PowderDry, bulk solid composed of fine, free-flowing particles
- Powder diffractionPowder diffraction is a scientific technique using X-ray, neutron, or electron diffraction
- PraseodymiumChemical element with atomic number 59 (Pr)
- Pre-exponential factorNumerical constant in the Arrhenius equation in chemical kinetics
- Precious metalRare, naturally occurring metallic chemical element of high economic and cultural value
- Precipitation (chemistry)Chemical process leading to the settling of an insoluble solid from a solution
- Precursor (chemistry)Compound that participates in a chemical reaction that produces another compound
- Preferred IUPAC nameChemical naming convention
- PrepolymerIn polymer chemistry, the term prepolymer or pre-polymer, refers to a monomer or system of
- PreservativeSubstance designed to prevent decomposition
- Pressure swing adsorptionMethod of gases separation using selective adsorption under pressure
- Priestley MedalAward
- Primary alcoholA primary alcohol is an alcohol in which the hydroxy group is bonded to a primary carbon a
- Primary batteryNon-rechargeable battery
- Process designProcess design in chemical engineering
- Process safetyStudy, prevention, and management of major hazardous material accidents in process plants
- Product (chemistry)Species formed from chemical reactions
- PromethiumChemical element with atomic number 61 (Pm)
- PropadieneOrganic compound (H2C=C=CH2)
- PropaneHydrocarbon compound (C3H8)
- PropenylIn organic chemistry, 1-propenyl (or simply propenyl) has the formula CH=CHCH3 and 2-prope
- Properties of metals, metalloids and nonmetalsComparison of the properties of the three main categories in the periodic table
- Properties of waterPhysical and chemical properties of pure water
- PropionaldehydeChemical compound
- Propionic acidCarboxylic acid with chemical formula CH3CH2CO2H
- Propionic anhydridePropionic anhydride is an organic compound with the formula (CH3CH2CO)2O. This simple acid
- Propyl acetatePropyl acetate, also known as propyl ethanoate, is an organic compound. Nearly 20,000 tons
- PropyleneChemical compound (CH3CH=CH2)
- Propylene carbonateChemical compound
- Propylene glycolChemical compound
- PropyneAlkyne hydrocarbon compound with three carbon atoms
- ProtactiniumChemical element with atomic number 91 (Pa)
- Protactinium(IV) oxideProtactinium(IV) oxide is a chemical compound with the formula PaO2. The black oxide is fo
- Protecting groupGroup of atoms introduced into a compound to prevent subsequent reactions
- Protein Data Bank (file format)The Protein Data Bank (PDB) file format is a textual file format describing the three-dime
- Protein–protein interactionPhysical interactions and constructions between multiple proteins
- Protic ionic liquidA protic ionic liquid is an ionic liquid that is formed via proton transfer from a Brønste
- Protic solventIn chemistry, a protic solvent is a solvent that has a hydrogen atom bound to an oxygen (a
- Proton affinityProperty of ions and molecules
- Proton-exchange membraneA proton-exchange membrane, or polymer-electrolyte membrane (PEM), is a semipermeable memb
- ProtonationAddition of a proton to an atom, molecule, or ion, forming the conjugate acid
- Prussian blueSynthetic pigment
- PubChemChemical information database
- Purified waterPurified water is water that has been mechanically filtered or processed to remove impurit
- PurineHeterocyclic aromatic organic compound
- PutrescineFoul-smelling organic chemical compound
- Pyramidal inversionFluxional process in trigonal-pyramidal molecules
- PyranoseIn organic chemistry, pyranose is a collective term for saccharides that have a chemical s
- Pyrethrin IIPyrethrin II is an organic compound that is a potent insecticide. It is one of the two pyr
- PyridineHeterocyclic aromatic organic compound
- Pyridine (data page)This page provides supplementary chemical data on pyridine.
- PyridiniumPyridinium refers to the cation [C5H5NH]+. It is the conjugate acid of pyridine. Many rela
- PyrimidineAromatic compound (C4H4N2)
- PyrochlorePyrochlore (Na,Ca)2Nb2O6(OH,F) is a mineral group of the niobium end member of the pyrochl
- PyrographyPyrography or pyrogravure is the free handed art of decorating wood or other materials wit
- PyrolysisThermal decomposition of materials
- PyrometallurgyBranch of extractible metallurgy
- PyrophoricityTendency of a chemical compound to ignite in open air
- Pyrotechnic compositionA pyrotechnic composition is a substance or mixture of substances designed to produce an e
- PyrotechnicianPyrotechnicians are people who are responsible for the safe storage, handling, and functio
- PyrotechnicsScience of creating combustibles and explosives for entertainment
