(acetone) H C02 H H Nonpolar: NO net dipole moment Net dipole 1.920 Net dipole 1.600 Net dipole 1.04

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Transcript of (acetone) H C02 H H Nonpolar: NO net dipole moment Net dipole 1.920 Net dipole 1.600 Net dipole 1.04

  • Polarity

  • Electronegativity EN

    •Describes an atom’s ability to compete for electrons with other atoms to which it is bonded.

  • ∆ E.N. gives a clue at so how ionic a compound is: Ex: HCl ∆ E.N. 3-2.1 = 0.9 vs. H-C 2.5-2.1 = 0.4 HCl bond has more “ionic character” it is said to be more polar because Electrons are not shared equally.

  • ΔEN =2.1-2.1=0

    ΔEN =3-2.1 = 0.9

    ΔEN =3.0-3.0=0

  • bond has a “dipole” to poles one is slightly Positive the other is slightly negative.

  • ΔEN 0-.5 non polar, ΔEN 0.6-1.6 polar covalent, ΔEN 1.7< Ionic

  • • Δ EN for HCl

    • 3.0 – 2.1 = 0.9

    • Ionic character from graph 20%

  • What is the ionic character for an KBr bond?

  • Dipole

    •Polar bond • Molecular dipole • (Dipole moment)

  • Look for polarity in a bond Look for symmetry In a molecule

  • Think about the geometry

  • Draw the Lewis structure for N3 -

    a. What is the electron geometry around the central Nitrogen?

    b. Does the ion have a dipole?

  • Predict the shape and find the dipole moment

    •HCN

    •SO3 •CS2 •OCS

    •SOCl2 •POF3