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- SaccharinChemical compound
- SachetAlthough its most usual definition is that listed under "packet" (see link above), a sache
- Safety data sheetSheet listing work-related hazards of a product or substance
- SafroleChemical compound
- Saint-Maixent-l'ÉcoleSaint-Maixent-l'École (French pronunciation: ) is a commune in the department of Deux-Sèvr
- SalammoniacHalide mineral
- Saline (medicine)Salt water for medical purposes
- Salt (chemistry)Chemical compound involving ionic bonding
- Salt bridgeLaboratory device used for electrochemistry
- Salt bridge (protein and supramolecular)In chemistry, a salt bridge is a combination of two non-covalent interactions: hydrogen bo
- Salt metathesis reactionType of a chemical reaction
- SamariumChemical element with atomic number 62 (Sm)
- Samarium (153Sm) lexidronamSamarium (153Sm) lexidronam (chemical name Samarium-153-ethylene diamine tetramethylene ph
- Samarium monochalcogenidesSamarium monochalcogenides are chemical compounds with the composition SmX, where Sm stand
- Samuel E. Horne Jr.Samuel Emmett Horne Jr. (July 26, 1924 –February 4, 2006) was a research scientist at B. F
- Samuel William Johnson (chemist)American agricultural chemist (1830–1909)
- Sandwich compoundChemical compound made of two ring ligands bound to a metal
- SaponificationProcess that converts fat, oil, or lipid into soap and alcohol
- Saturated and unsaturated compoundsClassification of organic compounds based on nature of their chemical bonds
- Saturated calomel electrodeThe saturated calomel electrode (SCE) is a reference electrode based on the reaction betwe
- Saturated fatFat in which the fatty acid chains have all or predominantly single bonds
- Saturation (magnetic)Seen in some magnetic materials, saturation is the state reached when an increase in appli
- ScandiumChemical element with atomic number 21 (Sc)
- Scandium nitrideScandium nitride (ScN) is a binary III-V indirect bandgap semiconductor. It is composed of
- Scandium(III) hydroxideScandium(III) hydroxide is an inorganic compound with the chemical formula Sc(OH)3, the tr
- SchematicRepresentation of a system using abstract graphic symbols
- Schlenk lineGlass apparatus used in chemistry
- ScopolamineTropane alkaloid & anticholinergic drug
- SeaborgiumChemical element with atomic number 106 (Sg)
- SedimentationTendency for particles in suspension to settle down
- Selenic acidChemical compound
- SelenideA selenide is a chemical compound containing a selenium with oxidation number of −2. Simil
- SeleniumChemical element with atomic number 34 (Se)
- Selenium dioxideSelenium dioxide is the chemical compound with the formula SeO2. This colorless solid is o
- Selenium hexasulfideSelenium hexasulfide is a chemical compound with the chemical formula Se2S6. Its molecular
- Selenium trioxideSelenium trioxide is the inorganic compound with the formula SeO3. It is white, hygroscopi
- Selenium-79Selenium-79 is a radioisotope of selenium present in spent nuclear fuel and the wastes res
- Self-assembly of nanoparticlesNanoparticles are classified as having at least one of its dimensions in the range of 1-10
- Self-healing hydrogelsType of hydrogel
- Self-ionization of waterAutoprotolysis or exchange of a proton between two water molecules
- Semi-empirical quantum chemistry methodMethod in quantum chemistry
- Semibatch reactorFor both chemical and biological engineering, Semibatch (semiflow) reactors operate much l
- Semiheavy waterChemical compound
- SemisynthesisType of chemical synthesis
- Separation processMethod that converts a mixture or solution into two or more distinct products
- Separatory funnelLaboratory glassware
- Serial dilutionStep-wise dilution of a substance in solution
- SettlingProcess by which particulates move towards the bottom of a liquid and form a sediment
- Sextuple bondCovalent bond involving 12 bonding electrons
- Shelby Gem FactoryAmerican artificial gemstone manufacturer
- ShellacResin secreted by the female lac bug
- Shielding effectDecrease in attraction between an electron and the nucleus
- Shielding gasGases commonly used in several welding processes
- Shikimic acidShikimic acid, more commonly known as its anionic form shikimate, is a cyclohexene, a cycl
- Side chainChemical group attached to backbone
- Side reactionA side reaction is a chemical reaction that occurs at the same time as the actual main rea
- Sigma bondCovalent chemical bond
- Sigmatropic reactionIntramolecular organic reaction in which a sigma bond is changed
- SilaneChemical compound (SiH4)
- SilanolA silanol is a functional group in silicon chemistry with the connectivity Si–O–H. It is r
- SilicateAny polyatomic anion containing silicon and oxygen
- SilicideA silicide is a type of chemical compound that combines silicon and a usually more electro
- SiliconChemical element with atomic number 14 (Si)
- Silicon carbideWide-bandgap semiconductor and abrasion-resistant ceramic
- Silicon compoundsChemical compounds with at least one silicon atom
- Silicon dioxideOxide of silicon
- Silicon monoxideChemical compound
- Silicon quantum dotMetal-free biologically compatible quantum dots with photoluminescence
- SiliconeFamily of polymers
- Silicone oilAny liquid polymerized siloxane with organic side chains
- SilverChemical element with atomic number 47 (Ag)
- Silver azideChemical compound
- Silver chlorideChemical compound with the formula AgCl
- Silver chloride electrodeCommon type of reference electrode in electrochemistry
- Silver iodideChemical compound
- Silver nanoparticleUltrafine particles of silver between 1 nm and 100 nm in size
- Silver nitrateChemical compound
- Silver nitrideChemical compound
- Silver permanganateSilver permanganate is an inorganic compound with the chemical formula AgMnO4. This salt i
- Silver(I) selenideSilver selenide (Ag2Se) is the reaction product formed when selenium toning analog silver
- Simple aromatic ringAromatic organic compounds consisting only of a conjugated planar ring system
- Simplified Molecular Input Line Entry SystemChemical species structure notation
- Simulated body fluidA simulated body fluid (SBF) is a solution with an ion concentration close to that of huma
- Single bondChemical bond between two atoms
- Single-walled carbon nanohornSingle-walled carbon nanohorn (SWNH or SWCNH) is the name given by Sumio Iijima and collea
- Singlet oxygenOxygen with all of its electrons spin paired
- Singlet stateIn quantum mechanics, a singlet state usually refers to a system in which all electrons ar
- Skeletal formulaRepresentation method in chemistry
- Small moleculeOrganic molecule weighing under 1000 daltons
- Smithson TennantSmithson Tennant FRS (30 November 1761 – 22 February 1815) was an English chemist. He is b
- SmokeMass of airborne particulates and gases
- Smoke inhalationBreathing in of harmful fumes produced by combustion
- Smoke screenA smoke screen is smoke released to mask the movement or location of military units such a
- Smoke signalSmoke used as a mode of communication
- SN1 reactionSubstitution reaction with a carbocation intermediate
- SN2 reactionOrganic chemistry reaction
- SNiMechanism for nucleophilic substitution reactions
- SodiumChemical element with atomic number 11 (Na)
- Sodium acetateChemical compound
- Sodium aluminium hydrideSodium aluminium hydride or sodium alanate is an inorganic compound with the chemical form
- Sodium azideChemical compound
- Sodium benzoateCommon food preservative
- Sodium bicarbonateChemical compound
- Sodium bisulfiteSodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture wit
- Sodium borateSodium borate is a generic name for any salt of sodium with an anion consisting of boron a
- Sodium borohydrideChemical compound
- Sodium bromideInorganic salt: NaBr
- Sodium butyrateSodium butyrate is a compound with formula Na(C3H7COO). It is the sodium salt of butyric a
- Sodium calcium edetateChemical compound
- Sodium carbonateChemical compound
- Sodium chlorideChemical compound with formula NaCl
- Sodium chloride (data page)This page provides supplementary chemical data on sodium chloride.
- Sodium chromateChemical compound
- Sodium cyanideToxic chemical compound (NaCN)
- Sodium cyclopentadienideChemical compound
- Sodium decavanadateSodium decavanadate describes any member of the family of inorganic compounds with the for
- Sodium deuteroxideSodium deuteroxide or deuterated sodium hydroxide is a chemical compound with the formula
- Sodium diacetateSodium diacetate is a compound with formula NaH(C2H3O2)2. It is a salt of acetic acid. It
- Sodium dichromateInorganic compound
- Sodium dithionateSodium dithionate Na2S2O6 is an important compound for inorganic chemistry. It is also kno
- Sodium dithioniteChemical compound
- Sodium ethoxideSodium ethoxide, also referred to as sodium ethanolate, is the ionic, organic compound wit
- Sodium fluorideIonic compound (NaF)
- Sodium hydrideChemical compound
- Sodium hydrogenoxalateSodium hydrogenoxalate or sodium hydrogen oxalate is a chemical compound with the chemical
- Sodium hydrosulfideSodium hydrosulfide is the chemical compound with the formula NaSH. This compound is the p
- Sodium hydroxideCaustic soda, with formula NaOH
- Sodium hypochloriteChemical compound
- Sodium iodideChemical compound
- Sodium metabisulfiteChemical compound
- Sodium metaborateChemical compound
- Sodium metavanadateSodium metavanadate is the inorganic compound with the formula NaVO3. It is a yellow, wate
- Sodium nitrateChemical compound
- Sodium nitriteChemical compound
- Sodium orthovanadateChemical compound
- Sodium oxideChemical compound
- Sodium ozonideSodium ozonide (NaO3) is an oxygen-rich compound of sodium. As an ozonide, it contains the
- Sodium perchlorateChemical compound
- Sodium permanganateChemical compound
- Sodium peroxideChemical compound
- Sodium phenoxideSodium phenoxide (sodium phenolate) is an organic compound with the formula NaOC6H5. It is
- Sodium polonideSodium polonide is a radioactive chemical compound with the formula Na2Po. This salt is a
- Sodium pyrosulfateSodium pyrosulfate is an inorganic compound with the chemical formula of Na2S2O7. It is a
- Sodium selenateSodium selenate is the inorganic compound with the formula Na2SeO4. It exists as the anhyd
- Sodium selenideSodium selenide is an inorganic compound of sodium and selenium with the chemical formula
- Sodium silicateHygroscopic chemical compound of variable Na2O/SiO2 ratio precursor of waterglass
- Sodium sulfateChemical compound with formula Na2SO4
- Sodium sulfideChemical compound
- Sodium tellurideSodium telluride is the chemical compound with the formula Na2Te. This salt is the conjuga
- Sodium thiocyanateSodium thiocyanate (sometimes called sodium sulphocyanide) is the chemical compound with t
- Sodium thiosulfateChemical compound
- Sodium triphosphateSodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP),
- Sodium–potassium pumpIon channel enzyme pump found in the membrane of all animal cells
- Sol (colloid)Colloidal suspension of very small [[solid]] particles in a continuous [[liquid]] medium
- SolderAlloy used to join metal pieces
- Soldering ironHand tool for soldering
- Solid acidAcid that is insoluble in the reaction medium
- Solid hydrogenSolid hydrogen is the solid state of the element hydrogen. At standard pressure, this is a
- Solid oxygenSolid oxygen forms at normal atmospheric pressure at a temperature below 54.36 K (−218.79
- Solid solutionChemical solution in solid form
- Solid solution strengtheningIn metallurgy, solid solution strengthening is a type of alloying that can be used to impr
- Solid-state chemistryStudy of solid materials' properties and composition
- SolubilityCapacity of a substance to dissolve in a homogeneous way
- Solubility chartChart describing whether ionic compounds dissolve or precipitate
- Solubility equilibriumThermodynamic equilibrium between a solid and a solution of the same compound
- Solution (chemistry)Homogeneous mixture of a solute and a solvent
- SolvationAssociation of molecules of a solvent with molecules or ions of a solute
- Solvation shellA solvation shell or solvation sheath is the solvent interface of any chemical compound or
- SolvatochromismIn chemistry, solvatochromism is the phenomenon observed when the colour of a solution is
- SolventSubstance dissolving a solute resulting in a solution
- SootProduct of incomplete combustion of hydrocarbons
- SorbitolChemical compound
- Soxhlet extractorLaboratory apparatus
- Space-filling modelType of 3D molecular model
- Spark (fire)Incandescent particle
- Speciality chemicalsChemical products that provide a wide variety of effects
- Specific rotationOptical property of chiral chemical compounds
- SpectroscopyStudy involving matter and electromagnetic radiation
- Speeds and feedsThe phrase speeds and feeds or feeds and speeds refers to two separate parameters in machi
- Speeds of sound of the elementsThe speed of sound in any chemical element in the fluid phase has one temperature-dependen
- Sphere packingArrangement of spheres within a space
- Spin density waveSpin-density wave (SDW) and charge-density wave (CDW) are names for two similar low-energy
- Spontaneous combustionType of combustion caused by a self-perpetuating increase in internal temperatures
- Spontaneous fissionForm of radioactive decay
- SporotrichosisSporotrichosis, also known as rose handler's disease, is a fungal infection that may be lo
- Spray dryingMethod of converting liquid or slurry to powder
- Spray nozzleDevice that facilitates dispersion of liquid into a spray
- Spring steelVariety of steel
- SqualeneOily chemical involved in sterol synthesis
- Stability constants of complexesConstants that describe stability of coordination complexes
- Stabilizer (chemistry)Chemical used to prevent degradation
- Stable isotopeNuclide that does not undergo radioactive decay
- Staggered conformationMolecular form in which substituents on two adjacent atoms are furthest apart
- StainA stain is a discoloration that can be clearly distinguished from the surface, material, o
- Stainless steelIron-based alloy resistant to rust and corrosion
- Standard atomic weightRelative atomic mass as defined by IUPAC (CIAAW)
- Standard electrode potentialElectromotive force of a half reaction cell versus standard hydrogen electrode
- Standard electrode potential (data page)Data values of standard electrode potential
- Standard enthalpy of formationChange of enthalpy during the formation of a compound from its elements
- Standard enthalpy of reactionEnthalpy difference due to chemical reaction, reduced to standard states
- Standard hydrogen electrodeReference redox electrode used under standard conditions
- Standard molar entropyStandard entropy content of one mole of a substance under a standard state
- Standard stateThermodynamics material reference point
- Stanford MooreAmerican biochemist (1930–1982)
- StannaneStannane or tin hydride is an inorganic compound with the chemical formula SnH4. It is a c
- Static mixerA static mixer is a device for the continuous mixing of fluid materials, without moving co
- Steacie PrizeThe Steacie Prize is a scientific prize awarded to a scientist or engineer of 40 years or
- Steady state (chemistry)Situation in which state variables of a chemical system are constant with time
- SteamWater in the gas phase
- Steam crackingPetrochemical process to break down saturated hydrocarbons in smaller molecules
- Steam distillationMethod of separation in organic chemistry
- Steam reformingMethod for producing hydrogen and carbon monoxide from hydrocarbon fuels
- Stearic acid18-Carbon fatty acid
- Stearyl alcoholChemical compound
- SteelAlloy of iron and carbon
- Step-growth polymerizationType of polymerization reaction mechanism
- StereocenterAtom which is the focus of stereoisomerism in a molecule
- StereochemistrySubdiscipline of chemistry
- StereoisomerismWhen molecules have the same atoms and bond structure but differ in 3D orientation
- StereoselectivityAbility of a chemical reaction to produce an unequal mixture of stereoisomers
- StereospecificityAbility of a chemical reaction mechanism to differentiate between stereoisomers
- Steric effectsGeometric aspects of ions and molecules affecting their shape and reactivity
- Sterling silverAlloy of silver
- Steven V. LeyBritish chemist (born 1945)
- StibineChemical compound
- StillApparatus used to distill liquid mixtures
- StoichiometryCalculation of relative masses of reactants and products in chemical reactions
- Strain (chemistry)When a molecule is deformed from its lowest-energy conformation by applied stress
- Strain gaugeElectronic component used to measure strain
- Streptogramin AStreptogramin A is a group of antibiotics within the larger family of antibiotics known as
- Stress–strain analysisStress–strain analysis (or stress analysis) is an engineering discipline that uses many me
- Stripping (chemistry)Physical separation process
- StrontiumChemical element with atomic number 38 (Sr)
- Strontium carbonateStrontium carbonate (SrCO3) is the carbonate salt of strontium that has the appearance of
- Strontium hydroxideChemical compound
- Strontium nitrateStrontium nitrate is an inorganic compound composed of the elements strontium, nitrogen an
- Strontium sulfideStrontium sulfide is the inorganic compound with the formula SrS. It is a white solid. The
- Structural chemistryBranch of chemistry which studies 3D structure of molecules
- Structural formulaGraphic representation of a molecular structure
- Structural isomerChemical compounds with the same atoms but arranged and connected differently
- StrychninePoisonous substance used as pesticide
- Strychnos nux-vomicaStrychnos nux-vomica, the strychnine tree, also known as nux vomica, poison fruit, semen s
- Substance (chemistry)Form of matter
- SubstituentAtom set which has replaced hydrogen atoms on a hydrocarbon's parent chain
- Substitution reactionChemical reaction in which one functional group in a compound is replaced by another
- Substrate (chemistry)Entity in a chemical reaction
- Suction filtrationFast filtration technique
- Sue Gibson (chemist)British research chemist (born 1960)
- Sugar alcoholOrganic compounds
- SulfateAnion of sulfur with 4 oxygen atoms
- SulfideIon, and compounds containing the ion
- SulfiteAnion of sulfur with 3 oxygen atoms
- Sulfite processIndustrial process to extract pure cellulose from wood pulp
- SulfolaneChemical compound
- SulfonateSalt, anion or ester of a sulfonic acid
- Sulfonic acidOrganic compounds with the structure R–S(=O)2–OH
- SulfoxideOrganic compound containing a sulfinyl group (>SO)
- SulfurChemical element with atomic number 16 (S)
- Sulfur dioxideChemical compound of sulfur and oxygen
- Sulfur hexafluorideChemical compound and greenhouse gas
- Sulfur monoxideChemical compound
- Sulfur oxoacidSulfur oxoacids are chemical compounds that contain sulfur, oxygen, and hydrogen. The best
- Sulfur tetrafluorideSulfur tetrafluoride is a chemical compound with the formula SF4. It is a colorless corros
- Sulfur trioxideChemical compound
- Sulfur vulcanizationProcess to transform the material properties of natural rubber
- Sulfuric acidChemical compound (H2SO4)
- Sulfurous acidChemical compound
- Sulfuryl diazideSulfuryl diazide or sulfuryl azide is a chemical compound with the molecular formula SO2(N
- SuperacidExtremely strong acid
- SuperalloyAlloy with higher durability than normal metals
- SuperbaseExtremely strong base
- Superfluid helium-4State of matter at low temperatures
- Superheavy elementChemical elements with atomic numbers from 104 to 120
- SuperoxideAny chemical compound containing an O2 ion (charge –1)
- Supramolecular assemblyIn chemistry, a supramolecular assembly is a structure consisting of molecules held togeth
- Supramolecular chemistryBranch of chemistry
- Surface scienceStudy of physical and chemical phenomena that occur at the interface of two phases
- SurfactantSubstance that lowers surface tension
- Survival kitEmergency equipment
- Suspension (chemistry)Heterogeneous mixture of solid particles dispersed in a medium
- Suzuki reactionCross-coupling reaction between boronic acid & an organohalide
- Swern oxidationIn organic chemistry, the Swern oxidation, named after Daniel Swern, is a chemical reactio
- Swimming pool sanitationSwimming pool sanitation is the process of ensuring healthy conditions in swimming pools.
- Sylvanus Thayer AwardThe Sylvanus Thayer Award is an honor given annually by the United States Military Academy
- SylviniteSylvinite is a sedimentary rock made of a mechanical mixture of the minerals sylvite (KCl,
- Symyx TechnologiesSymyx Technologies, Inc. was a company that specialized in informatics and automation prod
- Syn and anti additionIn organic chemistry, syn- and anti-addition are different ways in which substituent molec
- SyngasFossil fuel derived from other hydrocarbon sources
- Synthesis of carbon nanotubesClass of manufacturing
- Synthetic elementChemical elements that do not occur naturally
- Synthetic radioisotopeRadioisotope that is man-made and is not found in nature
- Synthetic rubberAny artificial elastomer
- Systematic element nameTemporary name assigned to predicted chemical elements
