Chemistry
Articles about matter, substances, reactions and chemical science.
Antimony tribromide
Antimony tribromide (SbBr3): properties, structure, uses, and safety
Antimony trichloride
Antimony trifluoride
Antimony trifluoride (SbF3)
Antimony triiodide
Antimony triiodide (SbI3): properties, preparation, uses, and safety
Antimony trioxide
Antimony trisulfide
Antimony trisulfide (Sb2S3)
Antioxidant
Antoine Lavoisier
Antoine Lavoisier: the chemist who founded modern chemistry
Apatite
Apatite (phosphate mineral group)
Aqua regia
Aqueous solution
Argon
Argon (Ar) — inert noble gas: properties, history and common uses
Argon is a colorless, odorless noble gas (Ar, atomic number 18). Inert and abundant in air, it has industrial uses from welding to insulating glass and roles in scientific instrume
Armstrong's mixture
Aromatic hydrocarbon
Aromatic hydrocarbon (arene)
Arsenate
Arsenic
Arsenic is a metalloid chemical element (As, atomic number 33) known for its varied chemistry, industrial uses (including gallium arsenide), and significant toxicity and environmen
Arsenic acid
Arsenic acid (H3AsO4)
Arsenic pentafluoride
Arsenic pentafluoride (AsF5)
Arsenic pentoxide
Arsenic pentoxide (As2O5)
Arsenic sulfide
Arsenic Sulfides — Minerals, Chemical Properties, Uses and Environmental Risks
Arsenic tribromide
Arsenic tribromide (AsBr3): properties, preparation and safety
Arsenic trichloride
Arsenic trichloride (arsenic(III) chloride)
Arsenic trifluoride
Arsenic trifluoride (arsenic(III) fluoride)
Arsenic triiodide
Arsenic triiodide (AsI3): properties, preparation, and precautions
Arsenic trioxide
Arsenic trioxide (As2O3): properties, uses, history and safety
Arsenic trisulfide
Arsenic trisulfide (orpiment)
Arsenide
Arsenide (As3−): chemistry, properties, reactions and uses
Arsenite
Arsenite: chemical forms, properties, toxicity and environmental role
Arsenous acid
Arsenous acid (arsenious acid) — properties, occurrence, and significance
Artificial sweetener
Ascorbic acid
Ascorbic acid (vitamin C): properties, biological role, uses and history
Asphalt
Asphalt (bitumen): composition, uses, history and environmental issues
Astatine
Astatine (Element 85): Properties, Isotopes, History and Uses
Atmospheric chemistry
Atmospheric chemistry: composition, processes, and environmental impacts
Atom
Atomic mass
Atomic mass and isotopic mass: definition, units, and relation to mass number
Defines atomic and isotopic mass, explains units (u and SI), shows how mass number and nucleons relate, and covers isotopes, relative atomic mass and how averages differ from singl
Atomic number
Atomic number (Z)
Atomic radius
Atomic theory
Atomic theory: development, structure, and applications
A concise account of atomic theory: its modern formulation, subatomic structure, historical development, key models, applications across sciences, and limitations in extreme states
Auger electron spectroscopy
Austenite
Avogadro constant
Avogadro's law
Avogadro's law: equal volumes of gases contain equal numbers of molecules
Azide
Babbitt metal
Babbitt metal: alloy for low‑friction bearings
Bain-marie
Bain-marie (water bath)
Bakelite
Bakelite: the first synthetic thermosetting plastic