CH28 – More Lewis

Dates
- P4 – Tuesday, October 31st
- P5 – Tuesday, October 31st
- P7 – Wednesday, October 31st
Review Lewis Structures
- H / F bond only once
- C / N / O / F always follow octet
- C never lone pairs
- Metals happy when partners happy
New Idea – Formal Charge
- FC = start – assigned
- assigned = lone electrons + half of bond electrons
- goal – help decide which is better
- example = carbon dioxide
New Idea – Ions
- how do I represent ions?
- example = nitrate ion
New Idea – Resonance
- what to do when two structures equivalent
- example = nitrate ion
New Idea – Exceptions to the Octet
- more than 8 (sulfur hexafluoride)
- less than 8 (aluminum hydride)
Practice, Practice, Practice
HCN |
IF3 |
H2CO |
SF4 |
NH3 |
AsF5 |
H2O |
XeF4 |
CF4 |
BrF5 |
PBr3 |
SF6 |
SO2 |
BaF2 |
BeCl2 |
XeF2 |
CH3Cl |
SO4-2 |
C2H2 |
NO3-1 |
HOCl |
NaCl |
For Each Substance (Two substances per side of page)
- total number of valence electrons
- Lewis dot structure
- formal charges (each element)
- central atom lone pairs / bonding pairs
- central atom bonding domains / lone pairs
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