Chemistry

Articles about matter, substances, reactions and chemical science.

Articles in this category: 1474 Updated: April 29, 2026 Page 27 / 31

Solvent

Solvent: definition, types, properties, uses and safety

Solvent extraction

Sorption

Sorption: adsorption and absorption — principles, types and applications

Specific gravity

Specific heat

Spectrophotometer

Spectrophotometer: Principles, Types, and Practical Uses

Spectroscopy

Spectroscopy: study of matter via interaction with electromagnetic radiation

Spectroscopy examines how matter absorbs, emits or scatters electromagnetic radiation to reveal composition, structure, temperature, motion and other physical properties across man

Spontaneity (chemistry)

Spontaneity (chemistry): Gibbs free energy and thermodynamic favorability

Staggered conformation

Staggered conformation (organic chemistry)

Stain

Stainless steel

Standard state

Starch

States of matter

States of Matter: solids, liquids, gases, plasma and beyond

Steam

Steam: properties, types, history, uses and safety

Stereochemistry

Steric effects

Sterling silver

Sterling silver: composition, properties, history, and use

Stibine

Sticky

Still

Stink bomb

Stoichiometry

Stoichiometry: Quantitative Principles of Chemical Reactions

Strong acid

Strontium

Strontium-90

Strontium-90 (radioisotope)

Structural isomer

Structural isomer (constitutional isomer)

Strychnine

Styrene

Styrene: structure, production, uses, and safety

Sublimation

Sublimation: the direct transition from solid to gas

Substance

Substance: material, composition, properties and classification

Substituent

Substitution reaction

Substrate (biochemistry)

Substrate (chemistry)

Sucralose

Sucralose: properties, uses, history and safety

Sucrose

Sucrose (table sugar): structure, sources, uses, and health

Sugar

Sulfite

Sulfite (SO3^2−): composition, properties, uses and health considerations

Summary of the sulfite ion (SO3^2−): structure, chemistry, common salts, industrial and food uses, environmental role, health effects and regulatory concerns.