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IUPAC Compendium of Chemical Terminology

 

[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M]
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observation height (in flame emission and absorption spectrometry), hobs
observation pathlength (in flame emission and absorption spectrometry), lobs
observation space (in flame emission and absorption spectrometry)
observation volume (in flame emission and absorption spectrometry), Vobs
observed rate coefficient
occlusion (molecular)
octahedro- (in inorganic nomenclature)
odd-electron ion
ODMR (Optically Detected Magnetic Resonance)
odour threshold (in atmospheric chemistry)
ohm
olefins
oligo
oligomer
oligomeric
oligomerization
oligomer molecule
oligonucleotides
oligopeptides
oligosaccharides
one-colour indicator
onion morphology
onium compounds
open atomizer
open dynamic system (in spectrochemical analysis)
open film
open hearth furnace (in atmospheric chemistry)
open-shell systems
open static system (in spectrochemical analysis)
open-tubular column (in chromatography)
operational pH cell
operational pH standard
operator gene
operon
opposing reactions
optical active polymer
optical activity
optical antipodes
optical-beam error (in spectrochemical analysis)
optical density
optical filter
optical isomers
optically labile
optical purity
optical resolution
optical rotation
optical rotatory power
optical spectroscopy
optical yield
optoacoustic spectroscopy
orbital
orbital energy
orbital steering
orbital symmetry
order-disorder transition
order of reaction, n
order parameter
ordered co-continuous double gyroid morphology
organelles
organic dye laser
organo-
organoheteryl groups
organometallic compounds
organyl groups
origin of replication (ori)
ortho acids
ortho amides
ortho- and peri-fused (polycyclic compounds)
ortho esters
ortho-fused (polycyclic compounds)
orthokinetic aggregation (in colloids)
osazones
oscillating reaction
oscillator strength
osmolality, m
osmolarity
osmotic coefficient, phi
osmotic concentration, c
osmotic pressure, pi
osones
osotriazoles
Ostwald ripening
outer electric potential, psi
outer Helmholtz plane (OHP)
outer-sphere electron transfer
outgassing (of a catalyst)
out-isomer
out-of-plane bending coordinate (in molecular geometry)
output rate
overall activation energy
overlap integral
overpotential, eta
oxa-di-pi-methane rearrangement
oxenium ions
oxidant (in atmospheric chemistry)
oxidation
oxidation number
oxidation-reduction (redox) titration
oxidation state
oxidative addition
oxidative coupling
oxidized species
oxidoreductases
oxime O-ethers
oximes
oxo acids
oxoacids
oxocarbons
oxo carboxylic acids
oxo compounds
oxonium ions
oxonium ylides
oxyacid (oxy-acid)
oxygen-flask combustion (in spectrochemical analysis)
oxylium ions
ozone hole
ozonides
sigma orbital

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