AP Chemistry Take Home Quiz
1. Determine the molecular shapes and predict the bond angles of
a. SbF5
b. BrF5
2. In the gas phase, phosphorus pentachloride exists as separate molecules.
In the solid phase, however, the compound is composed of alternating
PCl4+ and PCl6– ions. What change(s) in molecular shape occur(s) as PCl5
solidifies? How does the Cl – P – Cl angle change?
3. In addition to ammonia, nitrogen forms three other hydrides: hydrazine
(N2H4), diazene (N2H2), and tetrazene (N2H4).
a. Use Lewis structures to compare the strength, length, and order of
nitrogen-nitrogen bonds in hydrazine, diazene, and N2.
b. Draw the Lewis structure for tetrazene (atom sequence
H2NNNNH2)
4. Describe the hybrid orbitals used by the central atom(s) and the type(s) of
bonds (sigma and pi) formed in:
a. FNO
b. C2F4
c. (CN)2
5. Which molecule in each pair has the greatest dipole moment? Give the
reason for your choice.
a. SO2 or SO3
b. ICl or IF
c. SiF4 or SF4
d. H2O or H2S
6. An experiment requires 50.0 mL of 0.040 M NaOH for the titration of 1.00
mmol of acid. Mass analysis of the acid shows 2.24% hydrogen, 26.7%
carbon, and 71.1% oxygen. Draw the Lewis structure of the acid.