Name: ____________________________________________ Period: __________ Date: __________________
Learning Target:
I can explain how atoms form covalent bonds.
Criteria for Success:
I can explain the difference between polar covalent and non-polar covalent bonding.
I can classify a bond as either polar covalent or non-polar covalent based on electronegativity differences.
I can determine the net polarity of a molecule.
Polar Covalent and Non-Polar Covalent Bonding
A. ______________________ bonding can be either _________________________ or ___________________________.
1. A ____________________________________ bond is a covalent bond in which the bonding electrons are
shared ____________________ by the bonded atoms.
a. Generally speaking, ____________________________________ bonds occur between atoms with
electronegativity differences of _________________________________.
2. A _________________________________________ bond is a covalent bond in which the bonded atoms have
an ______________________ attraction for the shared electrons.
a. Generally speaking, __________________________________ bonds occur between atoms with
electronegativity differences of _______________________.
b. A ______________________ is used to represent this _____________________ sharing of electrons.
A _____________________ is represented by an ________________ with the head pointing toward the
___________________ pole and a crossed tail pointing toward the __________________ pole.
3. Using VSEPR theory, we can determine if there is an overall ___________ polarity to the molecule and draw a
single ___________________ to depict this.
Periodic Table
of
Electronegativity
Directions: Draw the Lewis structure for each molecule indicated below. Using the periodic table of electronegativity,
determine if the bonds are polar. If the bonds are polar, indicate the direction of the dipole for each bond. Finally, using
VSEPR theory and your understanding of molecular geometry, determine whether the molecule will have a net dipole
(be a polar molecule overall).
N2
1. Electronegativity Difference: ____________
2. Are the individual bonds polar or non-polar
3. Molecular Geometry: ______________________
4. Is the overall molecule polar or non-polar
H2O
9. Electronegativity Difference: ____________
10. Are the individual bonds polar or non-polar
11. Molecular Geometry: ______________________
12. Is the overall molecule polar or non-polar
CH4
17. Electronegativity Difference: ____________
18. Are the individual bonds polar or non-polar
19. Molecular Geometry: ______________________
20. Is the overall molecule polar or non-polar
HCl
5. Electronegativity Difference: ____________
6. Are the individual bonds polar or non-polar
7. Molecular Geometry: ______________________
8. Is the overall molecule polar or non-polar
CS2
13. Electronegativity Difference: ____________
14. Are the individual bonds polar or non-polar
15. Molecular Geometry: ______________________
16. Is the overall molecule polar or non-polar
NH3
21. Electronegativity Difference: ____________
22. Are the individual bonds polar or non-polar
23. Molecular Geometry: ______________________
24. Is the overall molecule polar or non-polar