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Chemistry Honors – Class 32

Glorious Lewis Dot Structures!

Glorious Lewis Dot Structures!

Dates

  • Period A: Thursday, October 29th
  • Period B: Thursday, October 29th
  • Period F: Friday, October 30th

Bonding

  • Bond Polarity Examples
  • Ch. 8 (27, 29, 33, 34, 35)

Lewis Structure

  • putting together ideas about bonding
  • drawings represent valence electrons (they bond)
  • ionic v covalent representations
  • ionic = use brackets (no sharing) with charge
  • Lewis structures are NOT for 3D representations

Lewis Structures Steps

  • count total valence electrons
  • identify central atom
  • arrange atoms outside of central atom evenly
  • bond each atom once
  • subtract bonding electrons from total
  • arrange remaining electrons to “make happy” (“happy” = formal charge equal zero)

Notes

  • bond = two dots = one line (shared)
  • “octet” only ALWAYS applies to CNOF
  • OK to have more than 8 (or less)
  • F, H only bond once
  • Carbon NEVER has lone pairs
  • electrons always placed in pairs
  • use FORMAL CHARGE to check work (#brought – #assigned)

Homework

  • No HW

Information

This entry was posted on October 28, 2015 by in CHPlans1516, SHP-CH and tagged , , , , .

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