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Lecture 8.4b- Polar Molecules
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Lecture 8.4b- Polar Molecules


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Section 8.4 lecture (part B) for Honors & Prep Chemistry

Section 8.4 lecture (part B) for Honors & Prep Chemistry

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  • 1. BELLWORK- Determine Shape Draw the Lewis Dot Structure and the 3D structure for ethane (C 2 H 6 ) and ethene (C 2 H 4 ). Do these molecules have any polar bonds?
  • 2. In review Equal sharing of electrons = covalent LOW electronegativity difference Unequal sharing of electrons = polar MEDIUM electronegativity difference Transfer of electrons = ionic HIGH electronegativity difference
  • 3. 2 bonding domains Three bonding domains Four bonding domains Three bonding and one lone pair Two bonding and two lone pairs
  • 4. Bond polarity and molecule shape determine if a molecule is polar Bond polarity --- When a bond has a partial negative charge on one atom and a partial positive charge on the other atom. Molecule shape--- the arrangement of atoms in three dimensions (3-D)
  • 5. A polar molecule has polar bonds and asymmetry
  • 6. A polar molecule has polar bonds and asymmetry Polar bonds Non-polar molecule Symmetry- all sides are the same δ - δ - δ - δ - δ +
  • 7. A polar molecule has polar bonds and asymmetry Polar bonds Non-polar molecule Symmetry- all sides are the same Polar bonds Polar molecule Asymmetry- has different sides δ - δ - δ - δ - δ - δ + δ + negative side Positive side
  • 8. If the electrons are not distributed equally, the molecule is polar. The molecule has a negative end and a positive end.
  • 9. A polar molecule has a partially positive side and a partially negative side. The arrow labels the molecular polarity. It shows that electrons are mostly by the oxygen atom O H H
  • 10. Polar molecules are affected by electric fields
  • 11. Polar molecules have two poles; one is partially positive and one is slightly negative. Positive end Negative end N H H H
  • 12. The positive pole (  + ) is attracted to negative ions and the negative poles(  - ) in other polar molecules. POLAR MOLECULES INTERACT!!
  • 13. + POLAR MOLECULES INTERACT!! The negative pole (  - ) is attracted to positive ions and the positive poles(  + ) in other polar molecules.
  • 14. Water is a molecule that has two polar O-H bonds.
  • 15. The electrons are not distributed evenly, so the water molecule is polar. The negative pole is at the oxygen. O is more electronegative than H, so electrons are pulled toward O. Also, there are two lone pairs around oxygen. negative end positive end
  • 16. Na + (aq) A dissolved sodium ion
  • 17. Water is very good at dissolving salts because it can surround anions & cations.
  • 18. Practice- Using last night’s homework assignment, label the molecular polarity on the four pictures H F
  • 19.
    • For the rest of the period work on your molecular modeling lab
    • Find a molecule that contains polar bonds
    • Build the molecule using a molecular modeling kit
    • Draw a sketch of the molecule
      • Label the bond polarity using δ + and δ -
      • Label the molecular polarity using
    HW- complete bonding practice problems #1-#17 Tuesday = cover network solids and intermolecular forces. HW- Section 8.4 Block Day = Complete modeling lab, plus finish bonding practice problems. Friday = Chapter Eight QUIZ!!
  • 20. Practice- Draw the 3D structures for these molecules and label the bond polarity and the molecule polarity.
    • H 2 O
    • CH 4
    • CH 3 F
    • CH 3 CH 3
    • CH 3 CH 2 OH
    • 6. NH 3
    7. CO 2 8. CH 2 CH 2 9. HCN 10. 11.