Question

Worksheet 8.1“Lewis Dot Structures and Formal Charge Calculations” 1. Goal: Draw Lewis Dot Diagrams and determine either formal charge or bond polarity. 2. Why: to understand chemical bonding, you must be able draw three dimensional representations to show bond angles and strength of chemical bonds. Students also need to be able to use Calorimetry equations to calculate enthalpy of reactions. Atomic number (2) Chemical symbol Be1 9.01 - Atomic mass 3A 4A 5A 6A beryllium (defined in section 4.9) 13 14 15 16 17 -Name Periods ----*||23|21|-25 0927 ទី ៧ តមើនទ៖ ឱង៥ជ ៩ Actinides Part A: Calculate the number of valence electrons and then draw Lewis Structure and determine the bond polarity. Valence Electrons Lewis Structure Formula Bond Polarity Count (by Octet Rule) 1. CO2 non-polar 0=6= 6 2. HCN H-CEN: Polar 3. H2O H?O?' Polar 4. H30 Polar

Answer 1

in outermont c is a Valence electrons are the electrons shell. Ex: Electronic configuration of chas 4 Valence elections l valence eleches 4 valence en Atom loi OI | I

Valence Lewis Electron count (vec) = 4+6 +6 = 16 structure : Ö= c = 0 Bond polarity: co bond is polas due to difference in electronegativity of .c and O. But ca molecule is nouapolar as dipole moment cancels out each-other. Ht o=c=ó Moso HCH lo 4 + S VEC = 1 + lewis structure : HroEN Bond polarity: Both bonds Hoc and can are polas due to electronegativ different. Molecule, too, is polar due to unsymmetrical geometry. TH₂O VEC = 1 + 1 + 6 = 8 Lewis structure a jot Bond polarity: oH bond is polar due to electronegetivity difference. H₂O molecules are polan too. due to unsymmetrical geomety.

[136] VEC - O f 1 + 1 + 6 = 8. کرایا جا Lewis structure : ture 8 1 H in H Bond polarity: 0-H bond is polas due to electronegativity difference between o and Hi The molecule, too, is polas due to unsymmetrical geometry.