CH301 Worksheet 6: Creating 3 dimensional structures of molecules to determine polarity A B C D E F GH I J K L M N O P Q R S T U Name molecular formulaInitial layout EN values Ionic or Covalent bond N A S B Octet rule? Double or triple bondResonance? Lewis dot structure #e- rich regions Electronic geometry Hybridization Bond angle Bonding pairs Unbonded pairs Molecular geometry VSEPR structure VSEPR with dipoles Polar? H2O NH3 I3- SO2 Explanation of columns: B Create symmetrical layout of atoms and assign EN values to each atom D Calculate ΔEN> 1.5, bond is ionic. If ΔEN< 1.5, bond is covalent. D-G Assign needed (N), available (A), shared electrons (S) and bond sites (B) for Lewis dot determination H Does structure follow octet rule. If yes, then answer J and K as below. I Double or triple bonds in molecule is S/2/B is integer > 1 J Resonance if (S/2)/B is not an integer K Create Lewis dot structure L Count regions of electron density to perform VSEPR and VB determinations M-O Electronic geometry, hybridization bond angle from regions of electron density P-R Bonding and nonbonding electron pairs around central atom and molecular geometry that results. S Draw VSEPR 3-D structure including all available electrons (column E) T,U Draw VSEPR 3-D structure with dipole moments (ΔEN) from column B. If ΣΔEN=0, then non-polar, ΣΔEN ≠ 0 then polar.Create your own molecules A B C D E F GH I J K L M N O P Q R S T U Name molecular formulaInitial layout EN values Ionic or Covalent bond N A S B Octet rule? Double or triple bondResonance? Lewis dot structure #e- rich regions Electronic geometry Hybridization Bond angle Bonding pairs Unbonded pairs Molecular geometry VSEPR structure VSEPR with dipoles
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