| 1,1-dimethylethane | Butane |
| 2-methylpropane | Butane |
| about | Editorial |
| absolute entropy | Absolute Entropies |
| absolute temperature | Volume-Temperature Measurements on Gases |
| Ac | Actinium |
| acetate | Symbols and Names of Ions |
| | Names and Symbols of Ions |
| acetylene | Compounds of Carbon and Hydrogen |
| acid | Acid-Base Equilibrium |
| | Strong and Weak Acids |
| acid dissociation constant | Dissociation Constants of Acids |
| acid ionization constant | Percent Ionization in Weak Acids |
| acid solutions | Autoionization (Dissociation) of Water |
| acid strength | Acid strength and Molecular Properties |
| acid-base equilibrium | Acid-Base Equilibrium |
| acidity | pH Value |
| actinides | Periodic Table of the Elements |
| actinum | Actinium |
| activation energy | Collision Model for Reaction Rates |
| adiabatic flame temperature | Chemical Properties and Reactions of Alkanes |
| affinity constant | Dissociation Constant |
| Ag | Silver |
| AgCl | Silver Chloride |
| Al | Aluminum |
| Alchemy | Transmutation of the Elements |
| alkali halides | Compounds of Groups I and II |
| alkalinity | pH Value |
| alkane isomers | Structure of Alkanes |
| alkanes | Structure of Alkanes |
| | List of Alkanes |
| | Chemical Properties and Reactions of Alkanes |
| | Occurrence and Use of Alkanes |
| alkyl chlorides | Hydrogen Chloride |
| alpha radiation | Phosphorescence, X-rays and Radiation |
| alpha-decay | Alpha-Decay |
| alum | Potassium Chromium Sulfate |
| aluminum | Aluminum |
| aluminum oxide | Aluminum Oxide |
| Am | Americium |
| americium | Americium |
| ammonia | Base Ionization, Neutralization and Hydrolysis of Salts |
| | Reaction Equilibrium |
| ammonia gas | Reaction Equilibrium |
| ammonium carbonate | Ammonium Carbonate |
| ammonium ion | Base Ionization, Neutralization and Hydrolysis of Salts |
| ammonium nitrate | Ammonium Nitrate |
| anhydrite | Calcium Sulfate |
| anions | Symbols and Names of Ions |
| | Names and Symbols of Ions |
| anti-bonding orbital | Bonding and Non-Bonding in Diatomic Molecules |
| | Ionization Energies of Diatomic Molecule |
| anti-knock agent | Octane |
| antimonite | Antimony Trisulfide (Stibnite, Antimonite) |
| antimony | Antimony |
| antimony trisulfide | Antimony Trisulfide (Stibnite, Antimonite) |
| Ar | Argon |
| argon | Argon |
| arsenate | Symbols and Names of Ions |
| | Names and Symbols of Ions |
| arsenic | Arsenic |
| arsenide | Symbols and Names of Ions |
| | Names and Symbols of Ions |
| As | Arsenic |
| association constant | Dissociation Constant |
| astatine | Astatine |
| At | Astatine |
| atomic bomb | Nuclear Fission |
| atomic number | X-ray Emission |
| atomic theory | Nuclear Chemistry |
| atomic weight | Atomic Weights of Gaseous Elements |
| | Atomic Weights of Non-Gaseous Elements |
| Au | Gold |
| auric | Symbols and Names of Ions |
| | Names and Symbols of Ions |
| aurous | Symbols and Names of Ions |
| | Names and Symbols of Ions |
| autoionization | Autoionization (Dissociation) of Water |
| aviation fuel | Occurrence and Use of Alkanes |
| Avogadro's Hypothesis | Pressure-Volume Measurements on Gases |
