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Chem 1C Exam 1 Ver 2

Chem 1C Exam 1 Ver 2 - 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 NAME AND PERM NUMBER ABOVE AND PRINT YOUR NAB/{E 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. 2 Chem 1C: Summer 2006: Exam 1 (Version 2) Perm 1. Draw the Lewis structures for PH3 and SE. Indicate the electron arrangement and the molecular geometry for each molecule. (6 points) Lewis Structure Electron Arrangement Molecular Geometry .P. - H" PHs ill/i \ Te l’YGAeolrae Pyransdaz H“ H H THEM P‘P/Ol‘hl'd OS' .... 3 -i5/ \E. lei-rwAWa-L v—swu F/ \p I'- SF; 2.(a) Write the valence electron configuration of the diatomic molecular ion N24" (2 points) (625); 6635"); (“'29) if (61?), (b) Is the molecular ion N; paramagnetic or diamagnetic? (2 points) hfflerfi veal/H C- (c) What is the bond order for NJ ? (2 points) 2- F 3. Draw the Lewis structure and molecular geometry for allene CH2=C=CH2. (6 points) Lewis Structure Molecular Geometry 4. 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. (b) London dispersion forces are most useful when comparing molecules of widely different masses. (c ) Permanent dipole-dipole forces exist only between polar molecules. (d) Dipole—dipole forces are most usefiil when comparing molecules of similar size. .London dispersion forces exist only between non-polar molecules fmseleummerOGverZ 1 Chem 1C: Summer 2006: Exam 1 (Version 2) Perm 5. Consider the skeletal structure for the following molecule. " F ”33 z c C :1 H /® 63 \ (fl @ \\ 4/ a) Write the molecular formula (4 points) C4 H 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) ‘l d) Indicate the hybridization on the labeled carbon atoms in the structure shown: (8 points) 1. Carbon(l)......$.1° I.— Carbon(2) ....‘fn Carbon (3) _____ 933.. Carbon (4) ..... 5 .E. e) Indicate the approximate bond angles for the structure shown: (6 points) Approximate bond angle: x .......... L29 0 y ......... 12—9. 0 z .......... If? ° f) Are all atoms in the same plane? Circle the answer. (2 points) Yes fmseleummer06ve12 2 Chem 10: Summer 2006: Exam 1 (Version 2) Perm 6, Draw the Lewis structure and indicate the molecular geometry for NF; and NH3. Ifthe 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 .N. /N"'"'F /N""~...p NE .. / l \ . F : F F I F 'f 'F' 'E' Pyrcmfgbuc NHs " on”. ~-.... W/T\H n/ x H H/J:\H H u, Pyramtfibat. 7. Circle the answer that best fits each of the following descriptions: (24 points) a) most ionic @ NaBr ClF HI b) lowest electronegativity F C @ O B N c)number of sigma bonds in H2C=CH-CH=CH2 S 6 7 8 ( 9 S 10 d)highest freezing point H20 HF e) greater bond order 022‘ 02+ f) lowest freezing point @ CO CO; g)lowest vapor pressure Cl; Br: ® h) greatest viscosity H25 HF ( H202) 8. Sketch the phase diagram of carbon dioxide. Draw a line on the diagram to indicate the process of sublimation. Mark the liguid-vapor mm‘lihfium line. (Note that the 1 atm point on P axis is indicated.) (8 points) L.-—- “gum - Vii—PD!“- ’d-I EQUILIBNV‘“ “Nb 6 latm fmsel CsummerOtSverz 3 Chem 1C: Summer 2006: Exam 1 (Version 2) Penn 9. The normal boiling point of Hg is 357°C. What would be the vapor pressure of Hg at 50°C? (AHW (Hg) = 59.] kJ/mol.) Show all work. (10 points) T 0 9' AM I _, _1_ 357 c (“(7% : pf, T T. 23571-273 PVG‘O L = 6301: at“, FILL? ~ 5-9100? I —-__L. 50": la. 9-31‘15‘31c“ L‘soK 32.3}: =$12+z73 T. T 5" = 32.3 K be“ P = —IO. 2 P' _ - a1; var 7 , m1B— 2:20 x10 10. Indicate the dominant intermolecular force in each of the following substances. (6 points) a) N'H4Cl lame- 19cm):3 DWI-E‘— DIWLF c) CF3(CF2CF2),,CF37 LL 1: NAME (PRINT) fmsel CsummerOtSverQ 4 ...
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