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PS8_dueweek11 - Dr. Kroner Problem set 8 Autumn...

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Unformatted text preview: Dr. Kroner Problem set 8 Autumn 2010 Due week of Nov. 29 Worth a maximum of 10 Points towards recitation #8 score Chemistry 121 Reading Assignment and quiz 8 coverage: Chapter 9 Chapter 9 HW (suggested): 1 ­10, 12, 15, 21, 25, 29, 35, 37, 43, 44, 47, 54, 55, 61, 66, 69. Lecture/HW questions: Show your work clearly and completely to each question for full credit. Write your solutions on this print out. No photocopied pages will be accepted. 1. Define the following terms: a. Valence shell electron ­pair repulsion model b. Bonding vs. non ­boding domains c. Electron domain vs. molecular geometry d. Bond vs. molecular dipole e. Molecular orbital diagram f. sigma (σ) vs. pi (π) MOs All Recitations 1 2. For each molecule below, draw its Lewis structure. Give the number of electron domains, bonding domains, non ­bonding domains, electron domain geometry name, and molecular geometry names. Sketch the molecular geometry, showing where the atoms are in 3 ­D (try your best!). a. H2S b. CH2Cl2 c. XeF4 d. BrO2– e. BeH2 All Recitations 2 f. CH3– g. BrF3 g. ICl4– h. SO32– All Recitations 3 3. Determine whether each molecule is polar or non ­polar. It would be helpful to consider the Lewis structure and molecular geometry for each molecule. a. b. c. d. NF3 AlCl3 CH2F2 SF6 e. f. g. i. SF4 CBr4 CH2O OCS All Recitations 4 4. For each molecule below: 1. 2. 3. 4. 5. 6. All Recitations 5 b. Be2 Draw MO diagrams for each molecule, using your textbook as a guide. Fill your MO diagram in with the appropriate number of electrons. Show sketches of all orbitals and give their symbolic names (i.e. σ1s, σ 2p, etc.). Give the MO electron configuration (i.e. σ1s2 σ1s*2 …). Calculate the bond order of the molecule. Explain whether or not the molecule the molecule is predicted to be stable. Is the molecule paramagnetic or diamagnetic? ∗ a. H2 c. C2 d. O2 All Recitations 6 5. Use your MO diagrams from #4 to predict the MO electron configurations, bond orders, and magnetic properties of the following ions. (Hint: add or remove electrons as appropriate from the most similar MO diagram in #7). b. H2– All Recitations 7 e. O2– d. O22– c. H22– a. H2+ 6. For the molecule NH2CH2COCHCHCCH, without nonbonding electrons shown: H H N H C C O H H C C C H C H a. Fill in the missing non ­bonding electrons above. b. Determine the hybridizations of each C, N, and O atom. c. What is the approximate bond angles about each carbon atom. (Hint: Write in the angles on the structure above). 7. Draw a Lewis structure for each molecule. Indicate the hybridization of each C, N, or O atom. What are the approx. bond angles of bonds involving C? a. CH3CH2COCH2CN b. CH3CONH2 d. How many total sigma (σ) and pi (π) orbitals does this molecule contain? c. CHOCH2CCH All Recitations 8 8. FOR THIS PROBLEM SET, COMPLETE AT LEAST FIVE OF THE MOLECULES BELOW ***Full Key for this problem available on Carmen*** For each of the following molecules, complete the following parts: i. Give the total # of valence electrons for the molecule. ii. Identify the central atom(s). Connect central atoms together when more than one. iii. Identify the non ­central atoms (also referred to as “ligands”). iv. Indicate the number of bonding domains, nonbonding domains, and total number of domains of each central atom. v. Determine the electron domain geometry and the molecular geometry of each central atom. vi. (Determine the hybridization of the central atom, using sections 9.4 ­9.6). vii. Sketch the molecular geometry of the molecule. viii. Determine if the molecule contains polar or non ­polar bonds. ix. Determine if the molecule is most likely polar or non ­polar. a. SiCl4 b. PF3 c. ClF3 d. VF5 e. SiH4 f. SF2 g. BeCl2 h. NH3 i. SF4 j. XeF4 k. BrF4– l. ICl2+ m. ICl2– n. CH3CH2CH3 o. CH3COCH3 p. CH2CHCOOH q. CH3CH2NH2 All Recitations 9 ...
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