Question

Draw Lewis structures for each molecule listed below, then use VSEPR theory to determine their bond angles as well as their electronic and molecular geometries. Based on AEN values obtained from your lecture materials or the internet, determine the polarity of the individual bonds in each molecule and predict based on their molecular geometries, if the molecules are expected to be polar or nonpolar as a whole. COMPLETE THE TABLE BELOW AND COME PREPARED TO DISCUSS ITS CONTENTS IN LAB Formula Lewis Structure Resonance: Y/N? Bond angles Electronic Geometry Molecular Geometry Polar or Nonpolar Bonds/Molecule A HO tetrahedral V-shape B. NH4" C. HCO D. CO Ö=c= linear - linear non polar F. PO 5-6 Lewis Structures and Molecular Models Workshop

Answer 1

A. H₂O Lewis structure & H O H Bond Angle : 104.5° Electronic Geometry: (Both bonding and non-bonding o Tetrahedral electrons included) Molecular Geometry & (General shape of molecule Bent or Angular Electronegativity values : H= 2.0 0 = 3.44 DEN = 3.44-2-20=124 , polar bonds. Because of its shape, H₂0 polarity adds up to form an overall polar molecule. 88 p | 7 + 8 x H St B. WHY : H-N-HI Tetrahedral Electronic Geometry Bond Angle=1090 Tetrahedral Molecular Geo. Electronegativity values. Since no lone pair is present) 1 H = 2.28 N=3.04 . DEN=3.04-20200084 All N-H bonds are thus polar. Since all atoms attached to N are H, No overall polarity. C. Ho & Pre Molecular and H oo (= 8 Here central atom is Electronic Carbon. metry: Dugonal & It is AX3 type molecule Planar Bond Angle = 120° Electronegativity values C = 2.55 0= 3.44 AEN = 3.44-2055 = 0.89. Polar bonds are present. (c-o) Do CO₂ : 8C = ő Bond Angle=180° Electronic • AN=0.89 - Tinear. polar bonds. Geometry = linear. I 8 c t on Overall Non-polar. No lone pairs on central alam. So molecular Geometry = thear

By choosing a central atom and counting the valence electrons, a lewis structure can be drawn satisfying valency of each atom. Central atom is of importance in VSEPR theory to determine geometry and shape of the molecule. Geometry includes the lone pair as well while shape does not.