Thursday, November 5, 2009

Thursday, November 5

-Lewis Structure

-can be drawn if you know composition of the molecule and how the atoms bond

-a single covalent bond, single bond, is a bond in which one pair of e- are shared b/t 2 atoms
EXAMPLE
http://www.bing.com/images/search?q=structural+formula+of+ethanol&FORM=BIFD#focal=33d84189786a894a145ce3585b7a5146&furl=http%3A%2F%2Fwww.green-planet-solar-energy.com%2Fimages%2Fethanol-ethanol.gif

***If Carbon is present, it is the central atom of the molecule. If it is not present, the lest electronegative atom is the central atom. Hydrogen is never the central atom***

-Multiple Covalent Bonds

-double bond--a bond in which two pairs of electrons are shared between two atoms

-double bonds often form in molecules containing carbon, nitrogen, and oxygen

-a double bond is written with two dashes between the two bonded atoms
EXAMPLE

-triple bond--a bond in which three pairs of electrons are shared between two atoms

-diatomic nitrogen and ethyne are two examples of molecules with double bonds
EXAMPLE

Single covalent bonds are the longest and lowest in energy
double covalent bonds are shorter and higher in energy
triple covalent bonds are shortes and highest in energy

-Double and Triple bonds are multiple covalent bonds

-when writing Lewis structures for carbon, nitrogen, and oxygen, remember multiple bonds between these atoms is possible
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17 comments:

  1. Andrew ParmenterNovember 5, 2009 at 4:24 PM

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

    Helpful information on the Lewis Structure

    ReplyDelete
  2. AnonymousNovember 5, 2009 at 4:33 PM

    this site helps explain how to draw a Lewis structure for a molecule

    http://antoine.frostburg.edu/chem/senese/101/bonds/faq/simple-lewis-structures.shtml

    ReplyDelete
  3. Mr. ScullyNovember 5, 2009 at 4:35 PM

    when writing chemical formula for molecules, put the least electronegative atoms first and the most electronegative atoms last.

    ReplyDelete
  4. (The) David RayNovember 5, 2009 at 4:43 PM

    site on chemical bonding

    http://www.visionlearning.com/library/module_viewer.php?mid=55

    ReplyDelete
  5. Will LongNovember 5, 2009 at 4:48 PM

    This is a site that explains how to draw lewis structures.

    http://www.molecularsoft.com/chemicalbond.htm

    ReplyDelete
  6. Patrick SweeneyNovember 5, 2009 at 5:28 PM

    Explains triple covalent bonds

    http://www.tutorvista.com/content/chemistry/chemistry-i/chemical-bonding/triple-covalent-bond.php

    ReplyDelete
  7. Jacob PoseyNovember 5, 2009 at 5:41 PM

    http://www2.nl.edu/jste/bonds.htm this page hepls with the various chemical bonds

    ReplyDelete
  8. Matt FarrellNovember 5, 2009 at 5:46 PM

    a fantastic site for learning how to draw lewis structures:
    http://www.chem.lsu.edu/htdocs/people/sfwatkins/MERLOT/drawlewis/dls.html

    ReplyDelete
  9. Will BrantleyNovember 5, 2009 at 5:49 PM

    http://www.800mainstreet.com/5/005-003a-Multiple.html
    This is a cool site that reiterates what we learned in class

    ReplyDelete
  10. Donnie SheaNovember 5, 2009 at 5:53 PM

    Good site on covalent bonding:
    http://www.chemguide.co.uk/atoms/bonding/covalent.html

    ReplyDelete
  11. Matt OriansNovember 5, 2009 at 5:57 PM

    this is a site that helps to explain double covalent bonds:

    http://www.chemguide.co.uk/atoms/bonding/doublebonds.html

    ReplyDelete
  12. Colby "Girlfraand" MabryNovember 5, 2009 at 6:02 PM

    http://www.webchem.net/notes/chemical_bonding/covalent_bonding.htm

    Here's a website that talks about single, double, AND triple covalent bonds. Yay.

    ReplyDelete
  13. Patrick BloseNovember 5, 2009 at 7:19 PM

    Good website on covalent bonds

    http://www.britannica.com/EBchecked/topic/141012/covalent-bond

    ReplyDelete
  14. Peter WetzelNovember 5, 2009 at 8:10 PM

    Helps clarify Covalent bonds:

    sixthsense.osfc.ac.uk/chemistry/bonding/covalent.asp

    ReplyDelete
  15. matt johnsonNovember 5, 2009 at 8:16 PM

    http://www.mikeblaber.org/oldwine/chm1045/notes/Geometry/Multiple/Geom06.htm Great site that talks about multiple bonds

    ReplyDelete
  16. Taylor AdkinsNovember 6, 2009 at 4:57 AM

    Good site on covalent bonds and lewis structures
    http://www.sparknotes.com/chemistry/organic1/covalentbonding/section1.html

    ReplyDelete
  17. Justin ScheunerNovember 6, 2009 at 5:01 AM

    good site on covalent bond networks http://www.avogadro.co.uk/structure/chemstruc/network/g-molecular.htm

    ReplyDelete

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