(inorganic chemistry) A corrosive acid, H₂CrO₄, known only in solution or as its salts, the chromates (from which it may be prepared); it is a very powerful oxidizing agent.

(chemistry) Any compound, of general formula HXⁿ⁺, which can be transformed into a conjugate base X⁽ⁿ⁻¹⁾⁺ by the loss of a proton.

(organic chemistry) An unsaturated organic acid, CH₃-CH=C(CH₃-COOH), found in angelica and having pharmacological uses; the trans- form is tiglic acid.

(organic chemistry) An aromatic heterocyclic organic compound, C₃N₃(OH)₃, that decomposes on heating to form cyanic acid; it is a prebiotic compound found in stellar dust clouds.

(organic chemistry) A white crystalline organic compound, N-cyclohexylsulfamic acid, whose salts, the cyclamates, have been used as artificial sweeteners

(biochemistry) A nonessential amino acid, L-α-amino-succinic acid, aminobutanedioic acid, found in animal protein and in sugar beet etc.

(organic chemistry) A long chain unsaturated fatty acid, CH₃(CH₂)₇CH=CH(CH₂)₁₁COOH, found in rapeseed and mustard seed oils; the cis- isomer is erucic acid, the trans- isomer is brassidic acid

(inorganic chemistry) the acid formally derived from sulphuric acid by replacing a hydroxyl (-OH) group by an amino (-NH₂) group - SO₂(OH)(NH₂)

A weak unstable acid, H₂CO₃, known only in solution, and as carbonate salts; it is present in carbonated drinks, and sparkling wine, but decomposes to form carbon dioxide and water.

(organic chemistry) an unsaturated organic dicarboxylic acid, HOOCCH=CHCOOH, the geometric isomer of maleic acid from which it may be prepared by heating; it is found in many plants, including fungi and mosses, and is essential in the chemistry of respiration; it has a number of industrial applications, and its esters, the fumarates, are used in the treatment of psoriasis