Exam 3 Test Form B - LAB SECTION SOS FORM B The University...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: LAB SECTION SOS FORM B The University of Arizona Chem. 151 Spring 2008 Andrew J. GTall, PhD / Wayne E. Wesolowski, PhD EXAM No. 3 THE FOLLOWING MUST BE COMPLETELY FILLED-IN OR YOUR EXAM WILL NOT BE GRADED. NAME: PRINT (clearly) my signature below certifies that I have used a calculator for numerical calculations only and that I have not done anything unethical while taking this exam» NAME—- SIGN THERE IS A 3—POINT PENALTY FOR ILLEGIBLE NAMES or Scantron corrections DIRECTIONS oDO NOT OPEN THE EXAM UNTIL. INSTRUCTED TO DO SO. oYOU MUST USE PENCILS ON THE SCANTRONS oON YOUR SCAN TRON — WRITE AND BUBBLE IN YOUR STUDENT ID STARTING ON THE LEFT —— FOR THE ‘8’ AT THE BEGINNING, BUBBLE IN A ZERO oON YOUR SCANTRON — WRITE AND BUBBLE IN YOUR LAST AND FIRST NAMES SEPARATED BY A SPACE OFILL IN THE CORRESPONDING FORM LETTER oKEEP ALL PAPERS IN FRONT OF YOU, ON YOUR DESK AT ALL TIMES. GCROSS OUT ANY SCRAP WORK THAT YOU DO NOT WANT INCLUDED IN YOUR ANSWERS. oFOR MULTIPLE CHOICE QUESTIONS, BUBBLE IN THE LETTER ON YOUR SCANTRON OF THE CHOICE 'I'I-IAT BEST ANSWERS THE QUESTION. UNLESS NOTED THERE IS ONLY ONE CORRECT CHOICE. IF MORE THAN ONE CHOICE IS SELECTED THE QUESTION WILL BE MARKED WRONG. SELECT THE CLOSEST NUMERICAL ANSWERS IF YOUR CALCULATION IS SLIGHTLY DIFFERENT. oFOR QUESTIONS MARKED “FREE ANSWER” or PARTIAL CREDIT —- INCLUDE ALL YOUR CALCULATIONS. IF YOU GIVE ONLY THE CALCULATED ANSWER, IT WILL BE GRADED AS ZERO CREDIT. oPOINT ALLOCATION FOR EACH QUESTION IS INDICATED. oGIVE ANSWERS FOR CALCULATIONS TO THE CORRECT NUMBER OF SIGNIFICANT FIGURES oWI-IEN YOU HAVE FINISHED PUT THE SCANTRON SHEET INSIDE THE BOOKLET BEFORE HANDING IT IN. oHOLD YOUR PICTURE II) UP TO YOUR FACE WHEN TURNING IN AN EXAM oWI-IEN FINISHED, LAST NAMES BEGINNING A—K, TURN IN YOUR TESTS IN FRONT — LAST NAMES L-Z, TURN IN YOUR TESTS IN THE BACK DO NOT WRITE IN THIS BOX 17 18 19 20 Page 1 Multiple Choice - Choose the BEST answer to each question and bubble it in on the scantron. Each probiem is worth 3 points. 1. What is the formal charge on the NITROGEN atom in each of the following ,+1, 0 B) -1, +1, -1 C) +3, +5, +1 D) 0, +1, +1 2. Which compound will have the strongest intermolecular attractions? elm 3. Which one of the following molecules is polar? D) H—Si—H H 4. In liquid nitrogen trifluoride, NF3, the molecules have the following intermolecular forces: A) dispersion forces B) dipole—dipole attractions C) hydrogen bonding D) and b are correct E) a and b and c Page 2 5. Below are 2 structures (isomers) of C2H2F2. Which structure would you expect to have a LOWER boiling point? A) Structure A tructure B C) They have the same boiling point 6. Count the number of sigma (G) and pi (1:) bonds in the following molecule: A) 5213 n=16 H H \ / 0:16 n=4 T T C) 6:12 112:4 N/C\C/N\C/H D) o=12 at=8 l I H/C‘\\~~I\1/C N 7. The oxalate ion (C2042) has four resonance structures. One is shown below. :0: u What is the BOND ORDER of the carbon—oxygen bonds? :9\C/C\6 _ mo? :0 8. Comparing the following structures, which is the most soluble in water? A) CHgOCHg H3CH2-OH C) CH3CHZCHZCHZCH2-OH D) CHgCHgCHgCHgCI-Ig Page 3 9. Arrange the foIIowing substances in order of increasing boiling point (Put the LOWEST boiling point first): RbBl', C02, NH3, OFZ A) RbBr < 002 < NH3 < 0F2 B) RbBr < NH3 < 0F2 < co2 6202 < 0F2 < NH3 < RbBr D) (:02 < NH3 < 0122 < RbBr 10. In a laboratory experiment, three solutions were tested to find their identifies. The possibilities were determined to be NaI(aq), Pb(N03)2(aq) and KZSO4(aq). Below are the results from mixing the different solutions together: — _ _ — From past experience, you know that lead(lI) iodide is a yeiiow solid and lead(II) sulfate is a white solid. Which soiution was the Pb(N03)2(aq)? A) Solution A B) Solution B @olution C 11. A good Lewis electron dot drawing of the molecule P113 is: A) C) D) H—iID'—H Hwil'd—H H—lrmfii H—IlL—H H H H H 12. The oxidation number of carbon in C02 is 4 B) +1 C) —2 D) 0 13. Arrange the following compounds in order of Increasing melting point (List the lowest first). LiF, NaF, KF, RbF A) LiF, NaF, RbF, KP B) LiF,NaF, KF,RbF @RhFKF, NaF, LiF B) KF,RbF, NaF, LiF 390 nm 550 nm 620 nm ———----—» Wavelength A chemist builds a simple atomic model to explain this spectrum. She assumes electrons emit energy when moving between three different quantized states, as shown in the diagram: Which of the three possible transitions, A, B, or C, E n = 3 generates light wit . H velength of 620 nm" B A) A = C) (3 n= 2 - A C n = 1 15. What are the correct bond angles (undistorted) as indicated in this molecule: H EH2 .. I l /‘\ .. H—-§#<|:—-—c——-c—o——H H l H to H :0: - mn- [all [I II E m N N v _ 1 199.5 _ _ G 16. Central atom, A, is surrounded by identicai B atoms. A-B is a polar bond, but the molecule is found to be nonpolar. Which of the following is not a possible geome n " uare pyramidal B) square planar ' )trigonal planar D) tetrahedral Page 5 Free answer — Answer the question completely — Show your work! Partial credit may be given. 17. Identify the strongest type of interparticle forces felt between the dissolving substance and water molecules. (dispersion, dipole-ninduced dipole, dipole-dipole, H- bonding, ion-dipole) (9 pts) 18. For each of the following substances, draw the Lewis dot structure and identify the electron geometry and molecular geometry. (linear, trigonal planar, bent, tetrahedral, trigonal pyramidal, trigonal bipyramidal, see—saw, T—shaped, octahedral, square pyramidal, square planar) (21 pts) Lewis Structure Electron Geomet Molecular Geometry Completely erase any unwanted electrons. If we can see any dots, they will be counted. Page 6 19. For each of the following substances, identify the ideal bond angles around the central atom in the molecule and label the molecnle as polar or nonpolar. Explain your polarity choice using arrows on a molecular drawing —— arrows must match your polarity choice. (12 pts) 20. Draw all equivalent resonance structures of the HC03— ion. The hydrogen is attached to one of the oxygeus. (10 pts) Page 7 Fr gRa {Ac Rf (223) 5226.0 E2270 (281) Periodic Table 11A 12A 1 33 I 4‘3 i 53 5‘3 7B SB i 1‘3 E 23 PA 14“ ES“ 25" in ESA % in £3 ' 12 31 (H We 3 11.008 g $4.003 3 .4 i 5 38 .7 £8 39 gm !2 Li [Be 'B 3c N 10 5F we 3 8.941 39.012 10.81 $12.01 14.01 518.00 119.00 E2018 g 11 in 13 214 15 218 1? :18 13 Na Mg é Al §5i P s écu IAr ‘ 322.99 24.31 g 28.98 328.09 30.97 132.07 3545 239.95 g E 119 I20 £21 :22 123 24 '25 E28 127 28 E29 30 31 332 33 E34 E38 g4 1K iCa 25c §Ti EV Cr Mn Fe ECo 'Ni ECU Zn Ga be As ‘Se §Br Kr 1 339.10 40.08 544.98 147.88 550.94 (52.00 154.94 55.85 $58.93 $58.59 E83.55 585.39 (69.72 172.81 74.92 {78.98 179.90 E83.80 3:87 538 i311 E40 E41 f42 §43 44 :45 I48 {47" E48 49 380 £51 E52 E53 E54 1 25 1RD Sr EY Zr Nb Mo ETC Ru Rh Pd Ag Cd In Sn Sb Te I Xe g @8547 87.82 {88.91 91.22 92.91 95.94 |(98) 101.1 102.9 108.4 107.9 112.4 114.8 118.7 1213:1216 128.9 131.3 E 355 58 157* E72 E73 74 {75 78 77 E78 [79— 80 81 E82 83 84 l85 E88 E6 =Cs Ba gLa Hf Ta W Re Os Ir Pt Au Hg TI '1’]: Bi Po At ‘Rn . 13231137351383 178.5 180.9 183.9 188.2 1902192211951 197.0 200.8 204.4 207.2 (209.0 (209) (210) [(222) 587 88 189’” 104 111 112 3 i i 105 106 107 !108 199 119 D 59 Bh 1H5 Mt b . (282) 3(283) [(282) (285) (288) (259) *7 i (272) (277) g £18811°8118g2181911§1 1111118 ...
View Full Document

Page1 / 8

Exam 3 Test Form B - LAB SECTION SOS FORM B The University...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online