1 / 12

POLARITY & VSEPR SHAPES

POLARITY & VSEPR SHAPES. Ionic: exchange of e- btn 2 atoms Covalent: equal sharing of e- btn 2 atoms Polar Covalent: unequal sharing of e- btn 2 atoms. How can we check for polarity?. Check difference in electronegativity btn the 2 atoms

mabli
Download Presentation

POLARITY & VSEPR SHAPES

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. POLARITY & VSEPR SHAPES

  2. Ionic: exchange of e- btn 2 atoms Covalent: equal sharing of e- btn 2 atoms Polar Covalent: unequal sharing of e- btn 2 atoms

  3. How can we check for polarity? • Check difference in electronegativity btn the 2 atoms • NOTE: noble gases have no # indicating a value of 0

  4. ∆EN Covalent 0 – 0.5 Polar Covalent 0.5 – 1.7 Ionic > 1.7

  5. Polar Covalent • If e- are not shared evenly btn 2 atoms, the atom with a stronger pull on e- (higher EN) becomes slightly –ve and the other atom becomes slightly +ve this is called a dipole and can be drawn in 2 ways

  6. Examples of Dipoles Gr. 11 Method: ς-ς+ O – H Gr. 12 Method: O – H

  7. Polarity and Shape • Check electronegativity difference 1st – if ionic or covalent the question of polarity is answered • If polar covalent, VSEPR shape must be checked to determine if dipoles cancel

  8. General Rule for Shape and Polarity • Assuming all surrounding atoms are identical, the following is true about overall polarity of the following shapes: Non-polar: dipoles cancel due to shape • Parent shapes + square planar Polar: dipoles do not cancel out due to shape • Kid shapes except square planar

  9. How does Polarity Cancel? • Consider the following parent shapes:

  10. Examples: • On Board • NCl3 • SF4 • PO43-

  11. Exceptions • A shape which is normally non-polar can be made polar if the dipoles don’t cancel • This will happen if the surrounding atoms are different, therefore having different sized dipoles

  12. Examples: • On Board • CH3Cl • BCl2Br

More Related