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Madsen practice exam solutions 2 - Midterm I Page 2 of 11...

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Unformatted text preview: Midterm I ' Page 2 of 11 Name KE 2 Student ID Number LAB Sec. # _; TA: ; Lab day/time: Dr. Dorte Madsen Winter 2009 CHEMISTRY 2A (Section B) Practice Exam II Instructions: CLOSED BOOK EXAM! No books, notes, or additional scrap paper are permitted. All information required is contained on the exam. Place all work in the space provided. If you require additional space, use the back of the exam. A scientific calculator may be used (if it is a programmable calculator, its memory must be cleared before the exam). (1) Read each question carefully. (2) For Parts I and H there is no partial credit given, and ONLY ANSWERS ON THE FRONT PAGE ARE GRADED (3) Use the correct number of significant digits in your answers (4) The last page contains a periodic table and some useful information. You may remove it for easy access. (5) If you finish early, RECHECK YOUR ANSWERS! U.C. Davis is an Honor Institution Possible Points m Name: Exam I (Page 6 of 11) Part III: Fill in the Blank Fill in your result in the assigned space - Partial credit may be given 18. (12 pts) Complete and balance the following equations. If no reaction occurs, so state \97 (a) CO32‘(aq)+H+(aq) ——-> C019) «r HZOUL) (b) Sl’O(S)+H20(1) —> Srtom1 Conga» (c) NaOH+HCN —-> qu (GUI) + H10 UL) 19. ( 12 pts) Balance the following reaction in basic solution CN (aq) + MnO4‘ (aq) ——> Mn02 (s) + CNO‘ (aq) < CNffi- H10 '9 (N9. + 1H+ + 2Q“ 3K3 96+ womw ~> moi - 2w %.y%o~oW/M GU\ w‘v ‘00 \2 3cm” + 2on0; +2211“ ~930Mb“ + Z“*\OZ+ H10 6.61 r J7 4 y“ ’N 4‘ 20H \“Ok zulo MM,“ BCN “(099+an0; (mgr) + HLO LL) 4 2) CNOA COL—l) «(— ZMH Otis} '4“ UN” («51‘ W/ Exam I (Page 7 of 11) 20. (6 pts) How many electrons can have n = 3, E = 2 and Mg = 3? O ? “L M; “lo \qu bd-wsux T76 19 5 21. (6 pts) How many electrons can have n = 5 , fl = 1, and m = — . 'Podoim 2 >9. \ l 4'0 22. (6 pts) How many angular and radial nodes does a 6f orbital have? 3 O \ Angular nodes: 3 d Z l : 6 Radial nodes: 2) ' 23. (6 pts) Write the electron configuration for the neutral iodine atom: a EKGSsZ‘Id‘OSPS 24. (6 pts) How many unpaired electrons does the Co2+ ion have? Name: Exam I (Page 8 of 11) ___________________._____———————————-———— Part IV: Long Answer Please show all work for calculations. Fill in your result in the box (remember units!) - Partial credit may be given 25. (12 pts) The energy levels for the hydrogen atom, in joules, are given by the equation __ —18 E = 2.178X10 J 2 n n What is the wavelength of the photon required to promote an electron from the ground state to n = 3? _ .L C , -18 AB: ~2.I‘?&x\olg\) x (3)1 “#3 : 4V. “1’40 j AE A awaits) 2 is H .\ ’— __ -/____,_\_‘__ _ _ _ E (0' h - QULQMDVUS ’ 2C1 X‘0 c 29%xe “/5 c, m 3x: " ”X l0 7: = l f‘ a) ' a a am” Hi 00m“ A 2 IO M am (5‘5. h555}!0\ by (Crush/xi" 26. (42 pts) Carbon dioxide produced in the reaction between ethane and excess oxygen Iét'wwla) according to rxn. I below is absorbed in excess aqueous barium hydroxide producing solid barium carbonate according to rxn H. (NOTE: Reactions may not be balanced) (:sz (g) 3:02 (g) —> 1 C02 (g) 1"}1‘120 <1) (rxn. I) C02 (g) + Ba(OH)2 (aq) —> BaCO3 (s) + H20 (1) (rxn. II) (a) What type of reaction is rxn I (circle all that apply) @ Neutralization Precipitation Redox/ (b) What type of reaction is rxn H (circle all that apply) \ {7/ ,. rm ' ' ~ / ' \ /, Combustion @fifiog @afio/fi Redox Exam I (Page 9 of 11) ‘ ’ (3|W‘°\ ,r- ”3 MW 0“ cw = ‘5“ =WO‘OE’GQ’5 —.- mane m ‘J‘ I “500% (“-2 (a) (“I 3O_O(o°\15/M0| \ , ~ ‘ «5 t s , , 5‘ 'h - , lmoflot ._ - x ‘ C01 Vuvv-Ll I!) l {QM 0" “(C01§ ._ ‘mo‘ CZHL K n(<-QHQ> .. 2,3?» \O “0‘ . \ .. "'5 , 1M" (“MM 1 nfibcwal = n (C013 = 2.5?»«0 mm M (bamb) § (6i? .rbibbfi j/mol m: HY] : O 50:}5 ( :’ ‘. 7t . ». (ERCO’ NOtE £93m), CUM ‘ f. “(W/‘03) or W 3) l w W 6 t (d) If the first reaction takes place in a 1 L reaction vessel at 300 K, what is the minimum partial pressure of oxygen required for all 0.0386 g of ethane to react? ,3 t flCClHL) 1’ 4.18 Kb moi (Vow KC) ) l ‘Vt-Oio \ ._ _ «3) ‘ (\(GJ — 1’ “a k 0(C1Hgl = 9.“)le mm 02 /\ molCLHb I -2, Lain no R\ {{qulg Mo\ K 0.081l Mark x30 2 (c) If 0.0386 g of ethane gas reacts under the conditions described above, what is the theoretical yield of barium carbonate? l l 4L (l 0.11mi“ ’Pnzolcfim O V ...
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