Tuesday, November 10, 2009

November 10

Today, we went over homework # 4. It was filled with symbols with Lewis structures and whatnot and I don't really know how to make those on this blog, so if you weren't here to get the correct answers, see someone who was here.

Formal Change
Formal Change = Valence Electrons - (Bonding Electrons/2) - Lone Pair Electrons
F.C. = V.E. - (B.E./2) - L.P.E.
In Lewis Structures, you want to create the structure with the lowest Formal Charge and have the central atom having a positive formal charge and the surrounding atoms have a negative formal charge.
A Comparison of Ionic and Molecular Compounds
-The force which holds ions together in ionic compounds is a very strong electrostatic attraction
-In contrast, the forces of attraction between molecules of covalent compounds are much weaker
-This difference in strength of attraction between basic units of molecular and ionic compounds gives rise to different properties between the two types f compounds.
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16 comments:

  1. Matt OriansNovember 10, 2009 at 3:06 PM

    Don't forget to start your outline over Chapter 6 and also there is a quiz on Thursday.

    ReplyDelete
  2. H.HillNovember 10, 2009 at 3:58 PM

    This site has problems for formal charges. www.cem.msu.edu/~reusch/vitualtext/Intro2.htm

    ReplyDelete
  3. Jacob PoseyNovember 10, 2009 at 4:08 PM

    http://www.angelo.edu/faculty/kboudrea/general/formulas_nomenclature/Formulas_Nomenclature.htm

    ReplyDelete
  4. (The) David RayNovember 10, 2009 at 4:17 PM

    this site talks about Lewis Dot Structures, Formal Charge, Resonance Forms & Arrows

    http://www.chem.tamu.edu/rgroup/romo/Chem227_502ontheWEB/Lewishandout.html

    ReplyDelete
  5. Colby "Girlfraand" MabryNovember 10, 2009 at 4:58 PM

    here's a good site on formal change.

    http://www.createchange.org/cases/scholars/chemistry.shtml

    ReplyDelete
  6. Mr. ScullyNovember 10, 2009 at 5:09 PM

    http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch8/lewis.html

    practice problems for those who want the EDGE on the competition!

    ReplyDelete
  7. Ben SmithNovember 10, 2009 at 6:02 PM

    http://www.elmhurst.edu/~chm/vchembook/143Aioniccpds.html
    a little review on ionic compounds

    ReplyDelete
  8. Taylor AdkinsNovember 10, 2009 at 6:12 PM

    http://www.ausetute.com.au/lewisstr.html
    lewis structures

    ReplyDelete
  9. Donnie SheaNovember 10, 2009 at 6:29 PM

    One note, it is formal CHARGE, not CHANGE.

    Here is a good site on formal change, and if you scroll to the bottom of the page there are links to info about lewis structures and resonance structures:
    http://cost.georgiasouthern.edu/chemistry/general/molecule/fc.htm

    ReplyDelete
  10. Evan HarknettNovember 10, 2009 at 6:47 PM

    this site explains lewis structures and formal charge
    http://www.mhhe.com/physsci/chemistry/carey/student/olc/ch01lewis.html

    ReplyDelete
  11. Chris MathewsNovember 10, 2009 at 7:26 PM

    remember outlines are due probably friday so if you haven't started you better get cracking

    ReplyDelete
  12. Matt FarrellNovember 10, 2009 at 7:43 PM

    this site explains formal change in ionic and molecular compounds:

    http://faculty.ncc.edu/LinkClick.aspx?fileticket=pZL2Afu41gk%3D&tabid=1870

    ReplyDelete
  13. Andrew ParmenterNovember 10, 2009 at 7:48 PM

    http://usm.maine.edu/~newton/Chy251_253/Lectures/Formal%20Charge/FormalCharge.html
    here is a good site about formal charges

    ReplyDelete
  14. Kyle McCafferyNovember 10, 2009 at 7:48 PM

    http://www.chem.ucla.edu/harding/tutorials/resonance/draw_res_str.html

    this website has practice and teaching on resonance and Lewis structures

    ReplyDelete
  15. Patrick SweeneyNovember 11, 2009 at 5:27 AM

    This is a good website on molecular compounds.

    http://library.thinkquest.org/3659/atommole/molecular.html

    ReplyDelete
  16. Justin ScheunerNovember 11, 2009 at 5:29 AM

    this site talks about how to draw resonance structures
    http://www.chem.ucla.edu/harding/tutorials/resonance/draw_res_str.html

    ReplyDelete

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