1.1 What is Chemistry?

http://www.ck12.org Chapter 9. Covalent Bonding

Lesson Review Questions

Reviewing Concepts

1. What causes molecular polarity?


2. Define electronegativity.


3. Explain how electronegativity changes across a period and down a group of the periodic table.


4. Define and give an example of a polar bond.

Problems

1. Which is the most electronegative atom in the periodic table?


2. Calculate the electronegativity difference for each of the following bonds:
   a. C-N
   b. C-F
   c. C-O
   d. H-I


3. Would you expect the bond in each of the following cases to be ionic or polar? Explain your reasoning.
   a. Mg-O
   b. H-I
   c. Li-F
   d. C-N

Further Reading / Supplemental Links

• Electronegativity video: http://www.brightstorm.com/science/chemistry/the-periodic-table/electronegativity/#


• Molecular polarity video: http://www.youtube.com/watch?v=0-zVXdeX7f4

Points to Consider

• How does the polarity of a molecule affect how that molecule interacts with other molecules?