-ol
-yne
1,3,2,4-Dithiadiphosphetane 2,4-disulfides
1,3-dipole
122 iron arsenide
2,3-sigmatropic rearrangement
2-(Dicyanomethylene)croconate
3-Deoxyanthocyanidin
4-Aminoquinoline
4-Hydroxy-2-alkylquinoline
4-Piperidinone
A15 phases
A3 coupling reaction
ACS style
AD-mix
ANRORC mechanism
ARL6IP6
Abderhalden's drying pistol
Absolute configuration
Absorption (chemistry)
Absorption band
Absorption spectroscopy
Abundance of elements in Earth's crust
Accommodation platform
Acemannan
Acene
Acetate
Acetogenin
Acetyl group
Acheson process
Achmatowicz reaction
Acid
Acid catalysis
Acid dye
Acid neutralizing capacity
Acidity regulator
Acidulant
Acid–base reaction
Acid–base titration
Acrylate polymer
Acrylic embedment
Acrylic paint
Acryloyl group
Actinide chemistry
Actinium
Actinium-225
Actinometer
Action spectrum
Activated carbon
Activation of cyclopropanes by transition metals
Active ester
Acyl azide
Acyl group
Acyl halide
Acylal
Acyloin
Acylsilane
Acylsugar
Acylurea
Adatom
Addition reaction
Adduct
Adhesive
Adiabatic electron transfer
Adipate
Adulterant
Aerobic methane production
Aerogel
Aerosol
Affinity electrophoresis
Aflatoxin total synthesis
Age of Earth
Agelasimine
Aggregated diamond nanorod
Agitated Nutsche Filter
Agrochemical
Air freshener
Air pollutant concentrations
Ajmalan
Albright-Goldman oxidation
Alchemical symbol
Alchemy and chemistry in the medieval Islamic world
Alclad
Alcohol
Alcohol burner
Aldol
Aldol condensation
Aldonic acid
Alembic
Alexander Butlerov Chemistry Institute
Alicyclic compound
Aliphatic compound
Alkali metal halide
Alkaline battery
Alkalinity
Alkali–aggregate reaction
Alkali–silica reaction
Alkaloid
Alkene carboamination
Alkenyl peroxides