Polarity of Molecules.pptx

Chemistry

1. POLARITY of MOLECULES Mrs. Analyn A. Vinoya Physical Science

2. Learning Objectives:

3. Important Terms:

4. Activity

5. POLAR nonPOLAR

6. 2 factors that determine the polarity of molecules

7. Electronegativity

8. Polar covalent bonds

9. Identify which of the following are polar or nonpolar molecules: 1.  H 2 EN of H = 2.1 _____________________ 2.  Cl 2 EN of Cl = 3.0  ____________________ 3.  F 2 EN of F = 4.0  _____________________ 4.  HI EN of H = 2.1     _______________________

10. Seatwork: POLAR or NONPOLAR

11. Answer key 1.CH4 EN of H = 2.1 EN of C = 2.5 ΔEN = 0.4 Non polar covalent  2.CF4 EN of C = 2.5 EN of F = 4.0 ΔEN = 1.5 Polar covalent   3. O2 EN of O = 3.4 ΔEN = 0.0  Non polar covalent bond 4. HBr EN of H= 2.1 EN of Br = 2.8 ΔEN = 0.7  Polar covalent bond

12. Molecular Geometry The valence shell electron pair repulsion theory or VSEPR theory

13. Molecular Shape

14. Guidelines to determine the VSEPR shape of a molecule:

15. CO2; wherein the electronegativity difference of C and O is 1.0 which makes the bond between them polar. However, carbon is placed in the middle of two oxygen atoms making the molecular structure linear. This equal distribution of polar bonds make the molecule non-polar.

16. Solubility, Miscibility, and Polarity General rule:  “like dissolves like” or “like mixes with like. ”

17. Determine the polarity of the following compounds based on electronegativity differences and molecular geometry.                          Molecular geometry        Polarity 1. HBr              _____________              ___________ 2. PH 3               _____________              ___________ 3. SiS 2              _____________              ___________ 4. O 2                 _____________              ___________ 5. BCl 3              _____________              ___________

18. Determine the polarity of the following compounds based on electronegativity differences and molecular geometry.                    Molecular geometry          Polarity 1. HBr              linear                           polar 2. PH3              trigonal pyramidal       polar 3. SiS2             linear                           non-polar 4. O2                linear                           non-polar 5. BCl3             trigonal planar             non-polar

19. EVALUATION: Determine the following: (Bond Polarity, Molecular Geometry and  Polarity of Molecule)                   Bond          Molecular            Polarity of                  Polarity       Geometry            Molecule a. H2O    ________        ________               ________ b. CCl4   ________        ________                ________ c. BF3     ________        ________               ________ d. SF6     ________       ________                ________ e. SiF4    ________       ________                ________

20. EVALUATION: Bond Polarity Molecular Geometry Polarity of Molecule a. H2O      polar            bent                          polar b. CCl4    non-polar         tetrahedral               non-polar c. BF3     polar          trigonal   planar        non-polar d. SF6    polar           octahedral               non-polar e. SiF4      polar              tetrahedral               non- polar