Definitions All key definitions from F324 0.0 / 5 ? ChemistryRings, polymers and analysisA2/A-levelOCR Created by: Sarah WalberCreated on: 30-12-13 19:27 Delocalised The pi electrons are shared amoungst more than two atoms. 1 of 11 Pi bonding system Side on overlap of p orbitals, above and below the plane. 2 of 11 Electrophile Electron pair acceptor. 3 of 11 Substitution Exchange of one atom or group with another. 4 of 11 Nucleophile Lone electron pair donor. 5 of 11 Zwitterion A molecule with both positive and negative charges. 6 of 11 Isoelectric point The point at which zwitterions occurs. 7 of 11 Optical isomerism Non-superimposable mirror images about a chiral centre. 8 of 11 Chiral centre Carbon with 4 different groups attached. 9 of 11 Chromatography Analytical technique which separates the components of a mixture between a mobile phase and a stationary phase. 10 of 11 Retention factor Distance moved by centre of solute spot/ distance moved by front of mobile phase 11 of 11
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