1 / 11

Polar Molecules

Polar Molecules. Section 4.4. Polar Bonds. Polar Bonds - look up electronegativity values for each element on the periodic table, then determine the difference: <0.4 non-polar bond 0.5-1.7 polar bond 1.8+ Ionic bond (only if a non-metal and a metal). Examples.

noel-puckett
Télécharger la présentation

Polar Molecules

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Polar Molecules Section 4.4

  2. Polar Bonds • Polar Bonds - look up electronegativity values for each element on the periodic table, then determine the difference: • <0.4 non-polar bond • 0.5-1.7 polar bond • 1.8+ Ionic bond (only if a non-metal and a metal)

  3. Examples • Are the following bonds polar? • HBr BH3

  4. Polar Molecules • Polar Molecules – have polar bonds and the molecule is not symmetrical (i.e. the charges are not shared equally around the central atom) Use VSPER • Non-polar molecules – can have polar or non-polar bonds that are equally shared around the central atom.

  5. Empirical Rules for Polar & Non-polar Molecules

  6. Examples • NCl3 • Polar • CO2 • Non-polar • H2O • Polar

  7. Applying VSEPR • Both shape and bond polarity will determine if the molecule is polar. • If the molecule is symmetrical the molecule will be non-polar. • A bond dipole is the new way to show the polar bond (they are vectors…)

  8. A quick review of Vectors = 0

  9. Theoretical Prediction of Molecular Polarity • Draw a Lewis Structure • Use VSEPR to determine the shape around each central atom • Use electronegativities to determine the polarity of each bond. • Add the bond dipole vectors and determine if the resultant is 0 (non-polar) or not 0 (polar)

  10. Examples • Are they polar or non-polar molecules? • SiBr4 • SF2 • BBr3

  11. Today’s Tasks • Pg. 253 #1-3 • Pg. 255-256 #6-10 • Pg. 256 #1-3

More Related