CHE106 Quiz 9
Name:
Total points: 10
Due date: Nov 29, 2011 (Tuesday) Note: First two questions are related to Exam 3.
1. (2 pt) Draw the Lewis structure for carbonyl fluoride, COF2. What are its
electron-pair and molecular geometries? What is the hybridization of the carbon
atom? What orbitals overlap to form the σ and π bonds between carbon and
oxygen?
2. (3 pts) Sketch the resonance structures for the nitrite ion, NO2-. Describe the
electron-pair and molecular geometries of the ion. From these geometries, decide
on the O-N-O bond angle, the average NO bond order, and the N atom
hybridization.
3. (5 pt) Calcium carbide, CaC2 contains the acetylide ion, C22-. Sketch the molecular
orbital energy level for the ion. How many net σ and π bonds does the ion have?
What is the carbon-carbon bond order? How has the bond order changed on
adding electrons to C2 to obtain C22-? Is the C22- ion paramagnetic?