Question

PART 3: COMPARING MODEL VS. REAL MOLECULES

12. Explore the Real Molecules screen.

        c. List the molecules that show a difference in bond angle between "Real" and "Model". Note: differences in bond angle may be small.

 

Molecule	Number of Lone Pair Domains

 

d. What do all of the molecules in the table have in common?

e. What trend do you observe that distinguishes lone pairs from bonding domains?

 

13. Use the simulation to build a system with 5 domains. This is called a trigonal bipyramidal structure. The two different sites a trigonal bipyramid are labeled as A and B in the drawing to the right.

f. Each A atom is adjacent to 3 B atoms. What is the A-C-B bond angle?

g. Each B atom is adjacent to 2 A atoms and 2 B atoms. What is the B-C-B bond angle.

h. In a system with 4 atoms and 1 lone pair, predict whether the lone pair will be in a B site or an A site? Explain.

i. Examine the molecule in the Real Molecules screen to check your prediction from question c. Which interactions are more important in determining where the lone pair will go?

 

 

EXERCISES:

1. A molecule has 2 double bonds on the central atom and no lone pairs. Predict the electron geometry. Predict the molecule geometry. What do you think the bond angles would be?

14. For each of the molecules below, determine the electron geometry, molecule geometry, and bond angles. Draw pictures to show your geometries.

a.  (4 CI atoms, no lone pairs on C)

b. (3 F atoms, 1 lone pair on P)

c. (2 F atoms, 2 lone pairs on O)

d. (2 I atoms and 3 lone pairs on central I)