Exam 5 (Final) - Rockley, Fall 2011, Chem.1314 Exam #5 Form...

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Unformatted text preview: Rockley, Fall 2011, Chem.1314 Exam #5 Form B. Page 2 of 9. > Q C D E fieow> .N DJ monw> What is the mass in g. of a sample of Mg(HCO3)2.2H20 (formula mass = 182.3 g/mol) that contains 4.68 x 10 24 atoms of oxygen. 177.1 236.1 202.4 283.4 None of these is within 10% of the correct answer 81¢“; I "71/ ‘ 5% (fag/Y KM 38 y in k ‘sz'xia ‘5’ 6 rid/(:1 g 0 :vafi I / The mass percent of oxygen in magnesium sulfite pentahydrate is: 68.4 ,8. / x , 884%,? . .. (j, t , . 247 my a 3 t 3 H10 W i 75.3 31.6 {7/1 65.8 I, g <. A I 99",! w 0"; g £81. E" i ‘8 Which of the following has an incorrect formula weight (in g/mol): Sulfurous acid = 82 Hz" 5 <3 3, Chloric acid = 84.5 Sodium bisulfate = 104 magnesium hydroxide = 41.3 potassium permanganate = 158 new} Kym/‘58“) Rockley, Fall 2011, Chem.1314 Exam #5 Form B. Page 3 of 9. 4. Which of the following has an incorrect oxidation number? A 8032‘ S=+4 w -11 B NOzl' N=+3 0: ‘3 ‘ t C P4 P = 0 . 1:: ,, a ’ 9. Z i’ 1' - D Mn04 1' Mn = +7 6 ‘ g E HC102 Cl=+2 p; -2 1g? 5,. ~ L/ 5. Which of the following is an incorrect statement of the bond angle about the central atom: A. BrF5 90° and180O B. IF41' 90° and180° 9.11:4” 109.5 0 D. s’og 120° E. HZCO (C is the central atom) 1200 6. How many moles of ions are present in 321 mL of a stock solution containing 0.22 g of aluminum nitrate per liter of the stock solution? A 6.63x10'4 AMMng 2/”? £21 9 ” 3/1/07, B 9.98 x 10 '4 t ” C 1.33 x 10 '3 D 4.14 x 10 '3 E None of these is within 5% of the correct answer Rockley, Fall 2011, Chem.l3l4 Exam #5 Form B. Page 4 of 9. 7. What is the wavelength in pm of the photon emitted by the electron in a Bohr model of the hydrogen atom in the transition from state n=6 to n = 4. 262x106 477x102 381x105 381x101 546x103 m Uta w > 8. If boron consists of two isotopes, one with mass 10 amu and the other with mass 12.0 amu, What is the % abundance of the heavier isotope, using the information from the periodic table? A 0.595 B 405 fix L IZ C 59.5 my]; : (j l6 v {3C1\ D 81.1 E 18.9 (UV IO} gt {,2}: '9 MN V 1 M T 0,90? ‘2 ‘L 9. How many grams of H3PO4 (PM. = 98.0 g/mol) are needed to react with 43.74 mL of 0.285 M Ca(OH)2? The reaction is: 9! & 1295;33"? 2. H3PO4 + 3Ca(OH)2 ‘9 Ca3(PQ4)2 + Q HOH we 2 A 120 B 081 C 1'25 Ma r at»th « D 000a; a—h_mwflm~,.,mna ; (gig, E 277 jg Rockley, Fall 2011, Chem.1314 Exam #5 Form B. Page 5 of 9. 10. Which of the following have correct hybridizations listed: 1. BrF3 sp3d2 2. co2 sp 3.131:4 1' sp3d2 4. HCN sp2 5. Brle sp3d A. l and 3 B. 2 only C. 3, 4 and 5 D. 1 and 4 B. All are correct hybridization specifications 11. Which of the following has the largest 2rld ionization energy? A O B. F C. N D Be E Li 12. What is the percent yield of a reaction in which 200.0 g. of aluminum reacts with excess water to form 128 g of Al(OH)3 and hydrogen gas? Equation is balanced. Formula masses (g/mol): H2 = 2.016 H20 = 18.02 Al(0II)3 = 78.00 1"" 7 [Z X $2351“; 6H20 9 3H; + 2A1( H)3 (2 4g“ .1? » ; S- , h A 22.1 / a 2m x mg L gm n B 32.8 e 3 . Qéé’ C 67.2 D 19.6 E None of these is within 5% of the correct answer Rockley, Fall 2011, Chem.1314 Exam #5 Form B. Page 6 of 9. 13. A small cylinder of gold (a gold coin) is 1/8” thick with a diameter of 1.4 cm. If the density of gold is 19.3 g/cm3, what is the mass of the coin in g.? A 9.43 i B 13.5 , S) ; c 18.9 (9,7 043'7 D 3.72 W E 531 pt ‘7 CM J Brie. v “4‘ Ma 3! (WM L Q'L/jfj 14. A meta1, M, is bonded to a nonmetal, X, by a polar covalent bond. 1f the bond length is 3.718 Angstroms and the fraction of electron that is transferred is 0.27, what is the dipole moment in Debye units? ‘ m m 9,2”? y it go: No 0.041 A a I” B 0.208 : 4.32 M g k)“ 4 3,7; 8 W0 C 17.8 m E 4.81 f... ' [ I ,’So " /. 1%? Ho 15. What is the rms velocity in m/s of dinitrogen pentoxide at 273.15 K? A 6.31x104 [MZ (75; B 7.94 C 7.94x102 “at ya 5/191? D 251 E 24.95 Rockley, Fall 2011, Chem.l314 Exam #5 Form B. Page 7 of 9. 16. Calculate AHO in kl per gram of 02 produced by the following reaction: 4 CQz(g) + 6H20 (g) 9 2 C2H6(g) + 7 02 (g) AH° in kJ/mol : were -84.7 , , C02(g) -393.5 (gigggygjll w. é/“ZL/INSJ - $77,793, 6’) H20 (g) -241.8 ” ‘ ’ H20 (I) -285.8 A 25.4 B —0.206 C 2855.4 D 0.206 E 12.7 17. Which of the following is incorrect for an atom or ion? A 14 N 3 ' has 7 protons, 7 neutrons and 4 electrons B with 26 protons,30 neutrons & 23 electrons the charge is +3 C if the charge is -l, and there are 53 protons, 73 neutrons, the symbol is I D 163 neutrons, 92 electrons, charge=0, means the symbol is U E Al 3 + has 13 protons 18. Which of the following combinations of n, 1, m1 are not allowed? n=1, 1: 0, m1=0 n=2, 1= 3, m1=2 n=4, 1: -2, ml=l n=2, 1: 1, ml=1 n=3, 1: l, ml=—2 .U‘PP’PT‘ 1', 2 and 3 2,4 and 5 2,3 and 5 1,3 and 4 only 2 and 5 are not allowed WOODS} Rockley, Fall 2011, Chem.13l4 Exam #5 Form B. Page 8 of 9. 19. Calculate the molar mass of a gas in g/mol if at a pressure of 86.4 kPa and 43 0C 456 mg occupies 418 mL. rm. *f a 4m A 1.09 Pwifiég if) ; 0,143” B 16 we“; C 28.4 h D 33.3 W W g p ” W5 E 39‘” (0. CJWQS’X'WNW) 0:U‘ if 20. For the Lewis structures of the following compounds, phosphorus pentafluoride, v sulfur hexafluoride bromine trifluoride NO BF3 which of the summary statements is correct: fienon tetrafluoride has a trigonal bipyramidal molecular geometry B. sulfur hexafluoride has bond angles of 900 120 ° and 1800 . PF5 and bromine trifluoride have a T-shaped molecular geometry ythere are only two exceptions to the octet rule for these molecules E. BrF3 has sp3d hybridization about the central atom u, 53 ME I I r (ml _ km ,. (11 F... , Rockley, Fall 2011, Chem.1314 Exam #5 Form B. Page 9 of 9. ...
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Exam 5 (Final) - Rockley, Fall 2011, Chem.1314 Exam #5 Form...

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