CHEN1211Fall06Test1

CHEN1211Fall06Test1 - flow/m K67 HOUR EXAM I/Version A...

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Unformatted text preview: flow/m K67 HOUR EXAM I /Version A CHEN 1211 Monday, Sept. 25, 2006 Profs. George & Bowman 6:30PM to 7:30PM VERSION A Answer all questions on the scantron answer sheet by filling in the proper bubble with a number 2 pencil. If you change your afiswer, please erase the undesired mark thoroughly. Be sure to fill in the boxes for your student number, name and lab section; then fill in the corresponding bubbles beneath them correctly. A periodic table with atomic numbers and masses is attached to the back of this exam. There are 6 exam pages and 14 questions. The last question asks for the version of your exam. Check to be sure you have answered all the questions. Please note the point values of each question. 1 Useful Information: Avogadro's Number = 6.022 x 1023 mol'1 Number of Moles = Concentration x Volume 1 kg = 1000 g 1 gallon = 3.7854 L l L = 1000 mL 1 amu = 1.6605 x 10‘24 g Planck's Constant, h: 6.63 x 10'34 Is c=7tv=3.0x108m/s E=hv 7L=hfmv 1A=1x10"°m U)» = R [l/m2 - l/n2 ] where m and n are integers and n>m R= 1.097 x 10'2 nm" Mass of an electron = 9.1 x 10'28 g : ILZL (8 Points) A mass of mercury occupies 0.650 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol is 0.789 L. ‘. , g/m mass #43 = Q.6SOL)OB’.S“}é3fl°fl‘j :. 88033 (a) 0.0378 L ‘ L. (b) 0.0896L Vowel], 64‘4"” = 88033 e-KM . val .1: 0.1873 '°°°“‘L’ (d) 26.4 L (e) Not within 10% of any of the above answers (6 Points) How many protons and neutrons are in the nucleus of 238U? b/‘om W'i’a’z aloe" > M ‘0 (a) 92 protons, 92 neutrons \ fir OJOMIL q 2- qz p/ofan 238-cyz 1; #14, A/eufi’dn S (b) 91 protons, 147 neutrons (c) 92 protons, 238 neutrons ' ' (d) 91 protons, 238 neutrons e 92 protons, 146 neutrons (9 Points) Copper has two naturally occurring isotopes, 63Cu with an isotopic mass of 62.9396 amu and 65Cu with an isotopic mass of 64.9287 amu. If copper has an atomic mass of 63.5460 amu given on the periodic table, what is the percent abundance of the 63Cu isotope?. - ._ 544287 (a) 434% -Y%O -r 1.93942) +’ (l X)( 3 (b) 49.7% 63-Wb—69-9L87 = X [(97 “73% " 9+3; 87] (c) 52.9% p ___- axe (d) 67.8% , 63 x: 0.6% >5 67.5% u. 4. 5. (6 Points) Which of the following statements is false? (a) The proton and electron have opposite charges. (b) The proton, neutron, and electron all have roughly equal mass. (c) Protons are positively charged. (d) Protons and neutrons are subatomic particles that are present in the nucleus. (e) Electrons are negatively charged particles that are not present in the nucleus. (6 Points) Balance the following equation:: ’ .X 3 a ( KM) iNOz+_I_HZO—>;HN03 +J_No If the coefficient in front of the reactant H20 is 1, what is the coefficient in front of the productNO? . ‘ M} x: g —+ (x~7> O: ZXZ-i—I: 53+(X"“7) 0’” Zx +/ :: zy+x (c)3 _ .3 ((1)4 ‘ X4] 27 I (6)5 Hf Z '2: [j I) “:2, K1” 3 2‘7 ‘7 x~+i r: 14 x23 X47: (9 Points) Sodium azide (NaN3) yields N2 gas when heated to 300°C. This reaction is used in automobile air bags. If 1.00 mol of N2 has a volume of 47.0 L under the reaction conditions, how may liters of gas can be formed by heating 38.5 g of NaN3? The reaction is: ' 2 NaN3 —> 3N2(g) + 2Na (a) 32.5 L 38.55 vat/3 x’ [Mela WW; 0.592! wt: (b) 37.1L @502 MIRA/3 Nan/3 (6m, ' j (d) 44.2L 05qu angled” Nam/’3 x 3 MOQJ NZ :1 0.3832 Moi-PS (e) 49.9L ' L maze; Ala/V3 “2.. 0.333; We; A2 x 47m, 2: W75 L (“i/wok, NZ / dmewwN‘ Va (QC/équ x ImaLC 0 r. [,025KI53m0/20 _l [6.09 0 c I 0 ( ma/c C (.020xzo , ,I, c H 0 e r0415»?! H Lac/2a m”; 7’ /.OZ§xIa H 20 ’0 30 ) 0 /,02§'I< 15 0 l I I 7. (9 Points) Combustion analysis of 0.1595 g of an unknown compound contammg carbon, hydrogen and oxygen produced 0.449 g of C02 and 0.184 g of H20. What is the empirical formula of the compound? *2 c : 0,9“,qu c0; , Imolc (02. I LOZOK/o Mala (a; 44.0/ ‘9 603 "2“ (a) C H O ‘3‘ a : 1.02.0 x10 ample c 5 10 _, 1,020 x10 mtg: .< 12 a/ c ' = o,/22§ c (b) C8H16O3 “aw—i"! MM! C 3 (C) C8H1802 H " 0"?" 3 ‘éO x I maze HEO .5 A”, “52'mw‘, Ugo I8.02. H 0 w -2. (d) C10H1002 Z 2 “a I H / 0g: I: 2.9:.42 x ID male H .0” " I0 "‘0‘ x , 2 ~ ) C10H200 , ample H '- 02206 g H O 3 magi 0 = 0.16953 «Lain ~— onzsfi C -002063H‘ '2 0.0%99 0 8. (6 Points) What is the final ethanol concentration when 50. mL of 0.13 M ethanol is W mixed with 80. mL of water? 4&5: cmC/n - WW ) v 3 L, V}, (b) 0.07M (m‘ '9 ; I , (c) 0.08M CC°m¢)n)z :— Cconb n D, 51, z (d) 0.10M , V1, [0.051. mug (e) 0.13 M Come ")2 > 0.05744 (8 Points) Consider Cr in the two ions CrO4‘ and Cr2072'. What is the sum of the Cr oxidation number in the first ion plus the Cr oxidation number in the second ion? Ciro; a» 0 {a ~2- (a)“14 Cr {a ~V7 (b) —4 (c) 0 2— v v (d) +7 Clio-7 ’5 O ‘9 2’ Cré*é: 75M rék 10. 11. 12. (9 Points) After the following unbalanced redox equation is balanced in acidic solution using the smallest set of integer values what are t§e o ficie ts in front of BrO3'(aq) and Br'(aq), respectively? _ I e- )t 5 +5 .7. .57 --l D LBrOflaq) +21% («1) a £13m (aq) L__~______J L+5¢’) reduijx 1 (a) 1, 3 (c) 2, 2 (d) 2, 3 (e) 2, 5 (8 Points) MRI (magnetic resonance imaging) body scanners used in hos itals operate at a radio frequency of 400 MHZ (1 MHz = 1 x 106 Hz and 1 Hz = 1 second' ). What is the energy of this light in units of kJ/mol? ’34 g M— i ,9 E : Lat/7:: 6173K ’0 JET ' 40mm? 3 (a) 9.97 x 10' kJ/mol i (b) 9.97x10'16 kJ/mol E x Magacimj NMWW I ,25” a 2' (c)160x10 :: z,é52><lo .7— K QOZZKID 3476 (d) 0.160 kJ/mol 3. “40 (e) 0.320 kJ/mol 3: 0' ’ 56’7 L179; : L60 x, 15% 33%; .3 (C) (8 Points) Light emission from excited hydrogen atoms yields a green wavelength that corresponds to an electron making the transition from the 4th shell (n=4) to the 2nd shell (n=2) where n is the principle quantum number. What is the wavelength of this green wavelength? Hint: The variables In and n in the Balmer-Rydberg equation represent the principal quantum numbers of the two hydrogen atom orbitals involved in the electron transition. I“ ” / l ‘ . 3 K [71:2 "27 W“ (a) 656 n -2 ‘ ~~—[— £2 [.097x i0 min" [12 ~13 (c) 434nm )‘ 2 L7; (d) 410nm [A __l_] 2 0:37: (e) 387nm ' 7 - ,' ("L '6 v z ,(I Hm )‘ 2.05 O 5 /\ : 4$6 ZHM (b) 13. (8 Points) For an electron to have a wavelength of 1 A (1 Angstrom = l x 10'10 m), what is the velocity of the electron expressed in terms of a fraction of the sgegd of light? (a) 0.012c 1/ :5 1/7 ._. éeéS X ’0 J5 — , ’Z “’10 @b30.024c§) FYI) ‘7,/xio gjflilxlt’) m (:9an (0) 0.0480 6 (d)0.24c [/2 7,268 >610 t};— J‘: k3 Ma "2 (e) 0.480 6 m . 3— k mag K:W:0.0Z¢—lc 329M c 3.6?me C;— ij ".7 ' I, z 21 5 T4: WW IS the ver510i1 0—f_ycour ex‘am?‘D (a) Version A (b) Version B 68 63V ems 58 a3 :3 $3 53 8E A33 :8 o.me emu 38 .5 oz vs. S"— mm no xm EU E< :n_ a2 3 an. E. 9: N2 5F 2: mm 8 S 8 mm 3 8 mm 2.... 8 aware/V. oat oat $9 29 3.8 0qu $3 22 32 av: NS; ad: to: 3.. n> E._. .m 0: >0 2. .90 am. En. 32 5 mo mouamfiafi E 2 mo 8 No 8 no 3 8 B om mm mm . 2805503 @308 . - pus RN :3: :3: 25 0:: 25 o< mm gag“! . . odom 32 32 «N2 «.8. Mom: 32 m2: 3: $2 29 manaamanaa.. mm E on E E t en E E R Q S 8 mm . . . S: 3.: ed: 32 v.8? 32 :2 8% 3.3 5.3 «NS 5.8 «0.8 :13 asaaam.naaaa.. E 8 mm B on 9. m t. 9. 9. 9 S 9. mm mm 5 .3 v IV we 09mm omdh wmdn Nmén mmNN Nude wmho mmdm mwdm mmdm mmdm oodm 3.0m wwNV mm modv 0—..mm 5! hm om w< 00 «0 :N :0 _z 00 w". .0 > t. ow «0 v. on mN mm mm mm VN mm mm rm 0 Gr 3 S S m m N m n v N m Swim mmNN m5. «2 £808 “SEEMS. , I 3 Nwod Pad 00 _n_ v <N t or 3 3 2 N <m # mfibofi 5 S mcowofim Sumo _. w unsav=< mum w m_ 08 282 35:83 9: *0 mink 052.5; .32 ...
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CHEN1211Fall06Test1 - flow/m K67 HOUR EXAM I/Version A...

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