List of Chemistry words that start with “O”.
- Octane number
- Octet
- Octet rule
- OHM
- Olefin
- Oligomer
- Only electrons flow
- Opacifier
- Open system
- Orbital
- Organic chemistry
- Organic matter
- Organic nitrogen
- Orthophosphate
- Osmosis
- Oxidant
- Oxidation
- Oxidation number / valence
- Oxidation process
- Oxidation reaction
- Oxidation state
- Oxidation-reduction-reaction
- Oxide
- Oxidizer
- Oxidizing agent
- Oxoacid
- Oxyanion
- Oxygenate
- Ozone
- Ozone layer
