Chemistry Review

OH HINTERMOLECULAR FORCES3. Hydrogen bonding• Type of dipole-dipole interaction between H & F, O, or NINTERMOLECULAR FORCES3. Hydrogen bondingEN:C = 2.5H = 2.1O = 3.51. H must be bonded to FON (H-bond donor)AND2. FON must contain an unshared pair of electrons(H-bond acceptor)HHCHHCHδ-OHδ+H-bonds are only 2-5% as strong as ionic bonds.Pure ethanol solutionINTERMOLECULAR FORCES3. Hydrogen bonding Compounds can be JUST H-bond acceptors• H-bond acceptor = double bonded oxygen will accept a HINTERMOLECULAR FORCES H-bonding is responsible for:• Holding DNA strands togetherINTERMOLECULAR FORCESINTERMOLECULAR FORCES4. Ion-dipole interactions• Between ionic compound and polar molecules• + ion is attracted to δ -• - ion is attracted to δ +• Strongest IMF – still a lot weaker than covalent or ionicbonds4. Ion-dipole interactionsOH HOH HOH HNa + Cl -3