A
- Abichite
- Acetaldehyde
- Acetaminophen
- Acetic acid
- Acetone
- acetyl
- Acetylcholine
- Acetylene
- acid
- Acrylamide
- Actinide
- Actinium
- Actinolite
- Activation energy
- Adolf Friedrich Johann Butenandt
- Adolf Otto Reinhold Windaus
- Adolph Wilhelm Hermann Kolbe
- Agate
- Ahmed H. Zewail
- Alabaster
- Alan G MacDiarmid
- Alan J Heeger
- Albertus Magnus
- Albite
- alchemical symbol
- alchemist
- Alchemy
- alcohol
- aldehyde
- Alexandrite
- Alfred Stock
- Alfred Werner
- alicyclic compound
- aliphatic compound
- Alkali
- Alkali metal
- Alkaline earth
- alkane
- alkene
- Allingite
- allotrope
- Allotropy
- alloy
- Alum
- Aluminium
- Aluminium gallium arsenide
- Aluminium oxide
- Alunite
- Alvite
- amalgams
- Amazonite
- Amber
- Amblygonite
- Amedeo Avogadro
- Americium
- Amethyst
- amide
- amine
- amino acid
- Ammonia
- ammonium
- Ammonium nitrate
- Ammonium perchlorate
- Amphibole
- Analcim
- Analcite
- Analytical chemistry
- Anatase
- Andalusite
- Andesite
- Anglesite
- Anorthite
- Anorthoclase
- Anorthosite
- Antimony
- Antoine Lavoisier
- Apatite
- Aquamarine
- Aragonite
- Archer John Porter Martin
- aromatic hydrocarbon
- argon
- Arne Wilhelm Kaurin Tiselius
- aromatic amine
- aromatic compound
- Arrhenius equation
- arsenic
- Arthur Harden
- Artturi Ilmari Virtanen
- Arfvedsonite
- Asbestos
- Astatine
- Astrochemistry
- atom
- atomic absorption spectroscopy
- atomic mass
- atomic mass unit
- Atomic nucleus
- atomic number
- Atomic orbital
- Atomic radius
- Atomic weight
- Auger electron spectroscopy
- Augite
- Axinite
- Azurite
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