sample exam - Chem 14A2 Exam 2 November 17"‘ 4...

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Unformatted text preview: Chem 14A2 Exam 2 November 17"‘ 4. Select from each of the following pairs of Lewis structures circle the one that is likely to make the dominant contribution to a resonance hybrid. (5 points each) 5. Referring o t e molecular orbital diagrams provided at the end of this exam, answer the following questions: (2 points each) a) What is the bond order of 0;? :2 5 ' b) How many unpaired electrons does 0; have? 7 - “’4 0) Can Ff‘ exist? No (circle one) d) Can 8622' exist? No (circle one) e) What is the bond order of Ca”? / ' / Student ID# Page 5 of 6 Chem 14A2 Exam 2 November 17‘" :O: l/ 3. For the molecule COH2 (formaldehyde) carbon is the central atom: a) State the orbital hybridization for the carbon atom. (2 points) b) Using the coordinate system profited below finish drawing the molecule. Then draw and label the sigma and pi-bonding that holds this molecule together. The carbon and oxygen are on the z-axis. (8 points) Student ID# Page 4 of 6 Chem 14A2 Exam 2 November 17m 1. For the following molecules: a) Draw the best Lewis Dot structure (3 pts) b) Label any non-zero formal charges present in that molecule (2 pts) 0) Name the electronic geometry (3 pts) d) Name the molecular geometry (3 pts) . e) State the orbital hybridization around the central atom (2 pts) f) State it the molecule is polar or non-polar (2pts) I. POCI3 (phosphorus is the central atom) EDWflW/C jam— 7lfllfa AVA / l( l ;v F~ Ma/cgua/ 7190-“ 2 ' I 5% 5C / I h /a ///” ll. XeF2 “ r, 84% lml'aflo V7L%9””4//’//’4m’”/”/ / Student ID# Page 1 of 6 Chem 14A2 Exam 2 November 17‘“ problem one continued a) Draw the best Lewis Dot structure b) Label any non-zero formal charges present in that molecule c) Name the electronic geometry cl) Name the molecular geometry e) State the orbital hybridization around the central atom f) State it the molecule is polar or non-polar 8/:de yfla « “MP/J " ml; Faé/jpa " 66/41 %P%q/ IV. HCF3 (carbon the central atom) //;/ €/f[7/MMC yflg — 71/071” 147d (’(wé/ j€y \ #71"! 5/ l fl/J/ Student ID# Page 2 of 6 ...
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