Chem worksheet

Chemistry 130 Autumn Quarter 2020

Name: _____________________________________

Unit Exercise 5: Chapter 6 Due 10/30/2020 at 11:59 PM as one file

You can look at your notes, the book, and D2L content to help do these problems as well as

discuss with your peers, and your instructor. You may not use internet sources or post any

of this on sites like Chegg or StuDocU. Doing so is an academic integrity violation. We

recommend you try these problem in an exam-like approach using just your calculator, a

periodic table and some paper. Only once you’ve tried them, go back and check your notes

and the book. Scan your answers and submit as one file.

1. a) In the space below or on your own paper, complete the molecular orbital diagram for the valence

electrons of superoxide anion O2–. Label each molecular orbital with 2s or 2p, as well as σ or π and an * if needed (for example “π*2p”). Fill in the electrons in the MO diagram. Based on your diagram, calculate the bond order for this species.

Bond order:___________________________________________

a) Based on your responses to part (a), is O2– likely to be a stable molecule? (Circle one) yes no

b) The ion O2– is (circle the correct choice): diamagnetic paramagnetic

Chemistry 130 Autumn Quarter 2020

2. The orbital drawn below is a representation of one possible molecular orbital (MO) for carbon dioxide formed from a linear combination of atomic orbitals on the C and O’s. Phases are shown in grey or white. Answer the following questions about the molecular orbital:

What type of orbital is it? (circle one): σ σ* π π* How many nodes does the orbital have?___________ 3. What are the theoretical ideal bond angles for A, B, and C, and the hybridizations of the selected

carbons?

Also fill out the following: Number of σ bonds:__________ Number of π bonds:__________ Formula: ____________ Molar Mass: _________________