chap-8-2011W

# 27 estimate its dipole moment dipole moment charge q

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Unformatted text preview: le Moment (µ) Given Given the bond length of HCl =1.27 Å, estimate its dipole moment. Dipole moment = charge (Q)× distance (d) µ= Q×d 1 electron charge = 1.60 × 10-19 coulomb =1× 1.60 × 10 coulomb × 1.27 ×10 meter -19 -10 = 2.03 ×10-29 coulomb-meters 1 Debye = 3.34 ×10-30 Coulomb·meter Coulomb· µ = 2.03 ×10 /3.34 ×10 -29 = 6.08 D Assume : H1+ --- Cl1- Hδ+ --- Clδ- -30 µ= Q×d +Q d Q Lewis Lewis Structure of CHN Step 1: C: 4e; H: 1e; N:5 e; total: 10 e Step 2: Step 3: Step 4: Formal Charges: C---N---H N---C---H N---C---H Polyatomic Polyatomic Ions • Polyatomic Ions: consist of two or more atoms bonded together. The groups of atoms stay covalent together by covalent bonding Cations: Subtract Subtract electrons from total Anions: Add electrons to the total NH4+ ammonium NO3- nitrate OH- hydroxide Lewis Structure of NH4+ 1. Total the electrons. 5e (N) +4 ×1e (H) -1e (charge) total = 8e 2. Give a possible Give arrangement arrangement. 3. Spread the electrons Spread Lewis Lewis Structure of SO2 Step 1: S: 6e; O:6 e; total: 2 × 6e +6e= 18e Step 2: O---S---O Step 3: or Step 4: O = S---O Formal Charges: 0 +1 -1 O = S---O O---S = O 0 +1 -1 O---S = O Resonance Resonance Structures O - S =O They both O =S - O - satisfy the octet rule - have the same number and type of bonds Resonance Resonance Structure: one of two or more Lewis structures for a single molecule or ion that cannot b...
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## This document was uploaded on 02/26/2014.

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