Chem 1C Exam 1 Ver 1

Chem 1C Exam 1 Ver 1 - First letter of your last name Chem...

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Unformatted text preview: First letter of your last name Chem 1C Midterm 1, Summer 2006 Name (Print): Perm: PRINT YOUR NAB/[E AND PERM NUMBER ABOVE AND PRINT YOUR NAME ON THE LAST PAGE OF THIS EXAM. This exam should contain 5 pages (this cover sheet and 4 pages of exam). Please count to make sure your exam is complete with no blank pages. You have 60 minutes to complete the exam. You are allowed one 8.5” x 11” sheet of paper. No books. Show all work for questions which require calculations, otherwise points will be deducted. Box your final answer to receive maximum possible credit. The exam is out of a total of 100 points. Ver. 1 Chem 1C: Summer 2006: Exam 1 (Version 1) Perm 1, Draw the Lewis structure and indicate the molecular geometry for NF3 and NH} If the molecules is polar, draw the molecule and show the direction of the net dipole moment. (6 points) Lewis Structure Molecular Geometry Molecule and the direction of the Net Dipole i] N .. .p N.__ . . "‘ P O. I F o I. ‘ . F F ' .. ‘ [9" m m- Jae ll; N " ‘ ---. H N - - NH3 " H / \ 14/ V 1+/ 1 \ H H u H Firewall-1.. 2. Draw the Lewis structure and molecular geometry for allene CH2=C=CH2. (6 points) Lewis Structure Molecular Geometry u H W \cz‘czc/ my H/ \H H 3. Which of the following statements is false. Circle the answer. (4 points) (a) London dispersion forces result from temporary fluctuations in the electron distribution within molecules. ndon dispersion forces exist only between non-polar molecules. (c ) Permanent dipoledipole forces exist only between polar molecules. (d) Dipole—dipole forces are most useful when comparing molecules of similar size. (e) London dispersion forces are most usefiil when comparing molecules of widely different masses. 4(a) Write the valence electron configuration of the diatomic molecular ion NJ (2 points) a. 4 '2— q ‘* I C025) C535.) 0% M519) (b) Is the molecular ion N; paramagnetic or diamagnetic? (2 points) Maw- mer‘c 1° ‘5 (c) What is the bond order for N; ‘? (2 points) 2.5‘ fmseleummerOfiverl 1 Chem 1C: Summer 2006: Exam 1 (Version 1) Penn 5. Consider the skeletal structure for the following molecule. H ,3. CH3 \ K"/® 1((12-(2 /@ ®\ * H 0 @\\v a) Write the molecular formula (4 points) C4 “5” b) How many pi-bonds are there in this compound? (2 points) 3 c) How many sigma bonds are there in this compound? (2 points) ‘1 d) Indicate the hybridization on the labeled carbon atoms in the structure shown: (8 points) 1 Carbonu) ..... "£9 2... Carbon(2) e) Indicate the approximate bond angles for the structure shown: (6 points) Approximate bond angle: 0 x ......... JP 1 O y .9: 9. O z ....... .J..?.° f) Are all atoms in the same plane? Circle the answer. (2 points) Yes fmseleummerOfiverl 2 Chem 1C: Summer 2006: Exam 1 (Version 1) Perm 6. Draw the Lewis stmctures for PH3 and SF} Indicate the electron arrangement and the molecular geometry for each molecule. (6 points) Lewis Structure Electron Arrangement Molecular Geometry O Q P .. PH3 / I \ Tewakedrd ?y IMMIde H” H PYY‘GWUA H S __ / \ Tetra».qu if SWQ‘L p: U I SF; ’3 a , . : l5 / \ F . , a . 7. Circle the answer that best fits each of the following descriptions: (24 points) a) most ionic @ NaBr ClF HI 1)) lowest electronegativity F C O N B c)number of sigma bonds in HZC=CH—CH=CH2 5 6 7 8 ® 10 d)highest freezing point H20 HF e) greater'bond order 022- t) lowest fi‘eezing point ® CO g)lowest vapor pressure Cl; Br; @ C02 h) greatest viscosity HZS HP 8‘ The normal boiling point of Hg is 357°C. What would be the vapor pressure of H3 at 50°C? (AHV.p (Hg) = 59.1 kI/mol.) Show all work (10 points) 0 14‘, .. mp ""'" "" (Fa?) _ T 1‘1 T. 35‘7t‘173 (3w? =— 630 K P? 3 I I > 57>" 44° __ 93100 _________ e M - mgr-22: T. T, -—5' 12k. : -lo-7L ) F :- 2.20Xl° 01:» W fmseleummerooverl 3 Chem 1C: Summer 2006: Exam 1 (Version 1) Penn 9. Indicate the dominant intermolecular force in each of the following substances. (6 points) a) NH4€l IO "1 L b) CHC13 3 I” L? ‘ 1" “LE c) CF3(CF2CF2),1CF3 L. D F- 10. Sketch the phase diagram of carbon dioxide. Draw a line on the diagram to indicate the armless of goblimation. Mark the li ui -v or uilibrium line. (Note that the 1 atm point on P axis is indicated.) (8 points) a P f s L5 Liqufb - VHO“- Eqwuomum LIME latm -\ G SUBLmn—‘nw NAME (PRINT) fmseleummer06ver1 4 ...
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Chem 1C Exam 1 Ver 1 - First letter of your last name Chem...

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