March 29, 2024, 02:09:33 AM
Forum Rules: Read This Before Posting


Topic: polarity  (Read 4202 times)

0 Members and 1 Guest are viewing this topic.

Kero_1116

  • Guest
polarity
« on: October 03, 2005, 09:21:41 PM »
anyone know the polarity of alcohol, ammonium chloride, gasoline, iodine crystal, glycerol, and chloroform?  i'm having difficulty with knowing if a compound is polar or non-polar
« Last Edit: October 03, 2005, 09:36:29 PM by Kero_1116 »

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re:polarity
« Reply #1 on: October 03, 2005, 09:24:13 PM »
Figure out whether it has an overall dipole moment and you'll be on your way.
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Kero_1116

  • Guest
Re:polarity
« Reply #2 on: October 03, 2005, 09:26:58 PM »
dipole movement?  i do not know anything about that

i know one way of finding the electonegativity, but how to find it on the compounds i stated
« Last Edit: October 03, 2005, 09:28:08 PM by Kero_1116 »

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re:polarity
« Reply #3 on: October 03, 2005, 09:52:34 PM »
You have to draw out the structure. :)

Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Offline mike

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1245
  • Mole Snacks: +121/-35
  • Gender: Male
Re:polarity
« Reply #4 on: October 03, 2005, 09:54:20 PM »
If you are familiar with electronegativity try looking at the difference in electronegativity in the bonds between various atoms in your molecules. If there is a large difference then the bond is usually polar. For example a bond between two carbon atoms C-C is not polar because the electronegativities at each end of the bond are the same, however in a hydrogen oxygen bond O-H the bond is polar becase the difference in electronegativities is large.

The next thing to consider is whether the molecule is symmetrical or not (can you put a mirror through the middle of the molecule). Because if the polarities of the bonds in a molecule cancel out then the molecule over all is not polar. For example CF4 has four polar C-F bonds in it, but the molecule is symmetrical so all the polarities cancel each other out to make the over all molecule non-polar.
There is no science without fancy, and no art without facts.

Sponsored Links