Polarity vsepr shapes
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POLARITY & VSEPR SHAPES PowerPoint PPT Presentation


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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

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POLARITY & VSEPR SHAPES

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Polarity vsepr shapes

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

How can we check for polarity?

  • Check difference in electronegativity btn the 2 atoms

  • NOTE: noble gases have no # indicating a value of 0


Polarity vsepr shapes

∆EN Covalent 0 – 0.5

Polar Covalent 0.5 – 1.7

Ionic > 1.7


Polar covalent

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


Examples of dipoles

Examples of Dipoles

Gr. 11 Method:

ς-ς+

O – H

Gr. 12 Method:

O – H


Polarity and shape

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


General rule for shape and polarity

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


How does polarity cancel

How does Polarity Cancel?

  • Consider the following parent shapes:


Examples

Examples:

  • On Board

  • NCl3

  • SF4

  • PO43-


Exceptions

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


Examples1

Examples:

  • On Board

  • CH3Cl

  • BCl2Br


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