Chem103F08T3 - Chem 1 03 Fall 2008 Exam 3B December 4 2008...

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Unformatted text preview: Chem 1 03 Fall 2008 Exam 3B December 4, 2008 Name é Section 1(10) Use the follow ng name bank to answer the questions below. Any name may be uscd more I than once. Place the letter of the correct answer in the space at the left. A. Planck B. Schrodinger C. Einstein D. Bohr E. deBroglie F. Rutherford G. Pauli H. Lyman I. Balmer J, Thomson K. Paschen 1. He assumed that angular momentum was quantized 2. He treated electrons as matter waves 3. He introduced the concept of the nuclear atom . h 4. He developed the equation/l : ~— to show the wave prepeity of matter. mv 5. He postulated that light has a particle nature. . He said that an electron traveled in a circular orbit around the nucleus. 7. He explained the photoelectric effect '8. He developed a mathematical equation relating the line spectrum of the hydrogen atom. 9. He explained blackbody radiation his as hm h Islet) 10. His atomic model explained the line spectrum of hydrogen. ' II(6) Draw pictures for the following orbitals. Label axes A. d... B. (1.2 W2 ‘61 Che111103 Fall 2008 Exam 313 December 4, 2008 Name g (2% Section 111(18) Place the cor ect a1 wers in the space at the lef r . . (a! uni: gkgzé My}? Eém 1. The ability of water to react with itself in an acid — base reaction is called the a/‘t‘ / fiX/U 2. The value of Kw at 25°C, iS 4 4 ' é; 5 7771;” 3. When a solution is acidic it has a pH value that is fd/ 9.! 4. The reaction of the conjugate base of a weak acid with water is called a? — ‘ reaction. @é!’ 5. War/e 6. Zip/9;: ‘ 7. (1/5 (a 73 Q (1 WI 8. postulated that energy, like matter is jdiscontinous/contiuousl and occurs in o r unaolzm ' A solution that can absorb a small amount of acid or base and not change pH is called a A continuous spectrum is evidence of the {wave/particle} nature of light. To explain the phenomenon of blaclcbcdy radiation, the scientist ya )7 9. unique amounts called (1' {2- fl 52¢c%’am10. When vaporized gas is excited by heat or electricity each element shows distinct lines of color at specific wavelengths. This is called y) 11. The principal quantum number has the symbol ‘ of the orbital _% 12. and describes the M 13. The orbital subshell describes the 30 rd 5/6 a .57 a. 650940014. of the orbital. 14. A bond that shares electrons between the two atoms involved in the bond is called a bond. 5. The measure of the ability of an atom involved in a bond to-attract the electrons in the bond is called 16. The first bond between any two electrons is called a bond. l7. The number of pairs of electrons around a central atom determines the geometry of the molecule. é; reflex ChemlO3 Fall 2008 Exam 3B December 4, 2008 Section 18. The charge an atom would have if the electrons in bonds are shared equally between the two atoms involved in the bond is called IV(32) Place the letter of the correct answer in the space at the left. L j; )— 9— 1. What is the conjugate acid of HCO3"? A. cog, '2 B. H30+ c. ago D. H2C03 E. 01—1" Which of the following is NOT a conjugate acid 7 base pair? A. NI‘14+/NH3 B. H3O+f OH" C. 1-12803 / HSOg D. CH3COOr/CH3COOH B. All are conjugate acid — base pairs How many of the following are WEAK acids? I-ICN I'IN03 HzPO4 7 1-1C102 C.2 D.3 13.4 A. 0 B. 1 Which of the following statements is TRUE? A. A strong acid is composed of a proton and an anion that have a very strong attraction for one another. B. A weak base is composed of a cation and an anion with a very weak attraction between them. C. A strong acid has a strong conjugate base D. The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid. E. None of the above statements is true. Which of the following is the strongest acid? A. H20 B. HgS C. H236 D. HBr E. HI Which of the following will have the strongest CONTUGATE BASE? A. 1-120 B. H28 C. HzSe D. HBr E. HI Which of the following is the strongest acid? A. I'ICIO3 B. HClO; C. HBr03 D. HBrOz. 131-1103 Which of the following is the strongest base? A. H2P03_ B. I‘IgPOzj— C. H2A8037 D. HgASO4 — E. H3PO4 3 Name é g/Z L ChemlO3 Fall 2008 Exam 3B December 4, 2008 Section 9. Which of the following is TRUE? A. In a neutral solution, [11301] = [H20] 13. A neutral solution does not contain any H3OJr or OH— C. An acidic solution has [H30+] > [OH‘] D. A basic solution does not contain any OH— E. None'of the above are true 10. Calculate the pH of a solution where [OH‘] = 7.8 x 104. A. 1.28 B. 5.11 C. 12.71 D. 8.89 E. 9.64 11. Which of the following will form an acidic solution in water? A. NH4Br B. NaF C. Lil D. KNO3 E. RbC103 12. Which of the following will form a neutral solution in water? A. NanHgoz ' B. KCiOg C. LiCN D. LiBrO E. KN03 13. Which of the following is TRUE? ' A. A buffer is an aqueous solution composed of two weak acids. B. A buffer can absorb an unlimited amount of acid or base C. A buffer resists pH change by reacting with both acids and bases D. A buffer does not change pH when strong acid or base is added E. A buffer is an aqueous solution composed of a strong acid and a strong base 14. Which of the following can be used to make a buffer? A. 100 mL of 0. 1M CHgCOOH and 100 mL of 0. 1M NH; B. 100 mL of 0.1M HCl and 100 mL of 0.1M NaOH C. 100 ml. of 0.1M NH3 and 50 mL of 0.1M I-ICl D. 100 mL of 0.1M NH; and 50 mL of 0.1M NaOH E. 100 mL of 0.1M NH3 and 100 mL of 0.1M HCl 15. Which of the following has the longest wavelength? A. ultraviolet B. infrared C. gamma rays D. microwaves E. visible 16. Which of the following has the highest energy? A. ultraviolet B. infrared D. microwaves C. gamma rays E. visible 17. Which of the following has the lowest frequency? A. ultraviolet B. infrared C. gamma rays D. microwaves B. visible ChemlO3 Fall 2008 Exam 3B December 4, 2008 Name fl 5 Section C 18. Which of the following visible colors has the largest frequency? A. green B. red C. blue D. yellow B. orange 2% 19. Which of the following visible colors has the longest wavelength? A. green B. red C. blue D. yellow B. orange /" if 20. Which of the following transition in a hydrogen atom represents emission of the longest wavelength photon? A. n= 1 ton=2 B. n = 3 to n = 1 C. n = 3 to n = 4 D. n = 4 to n = 2 E. n=5 ton=4 21. How many different orbitals are contained in the n = 3 principal level of a given atom? A.9 B.3 C.18 D.7 ‘ 1-3.5 22. Which of the following is not a correct set of quantum numbers? A. (3,2,1,-1/2) B. (2,’1,l,l/2) C. (4,4,—3,-l/2) D. (l,0,0,1/2) E. (3,0,0,1/2) 23. Which of the following would have the same electron configuration as plumbous ion? A. mercury B. mercurous ion C. mercuric ion D. gold E. aurous ion 24. Which of the following bonds is most polar? islets his h l‘ h A.HwI B. HmBr CHeF D.H—Cl E.C—H 25. Which of the following bonds is MOST COVALENT? A. Cal; B. CaBrg C. B312 D. BaBrz 26. Which of the following bonds is MOST IONIC? A. C312 B. (3331'; C. B312 D. BaBt‘z 27. Which of the following bonds is LEAST IONIC? A. NlClz B. PdClg C. NaCl D. KCl 28. Which of the following bonds is LEAST COVALENT? A. F60 B. F6203 C. F8304 5 ChemlO3 Fall 2008 Exam 3B December 4, 2008 Name (9‘? Section C I 29. How many of the following elements can form compounds with an expanded octet? l 0 Cl Xe F A.l B.2 (3.3 13.4 ES a 30. How many of the following compounds DO NOT obey the octet rule? BF} N02 BI‘F3 PC13 - A.l B.2 C3 D4 13.5 C 31. For the molecule Xng which of the following is FALSE. The VSEPR notation is 133sz The molecular geometry is linear The electron geometry is linear The molecule in non polar The molecule does not exhibit resonance econ? f 32. Which of the following compounds contains at least one polar bond, but the molecule in non polar. A. OCS B. 0C1; C. X302 D. BrFs E. SeClg V(16) Complete the following Table: (central atom underlined) or Ion notation Geometi Geometr X Cl A r43 m 2W 5 PCl ,.. ' - Mm? F a _ f I r 7 ad VH6) Using the shorthand notation, write electron configuration for the following: A. MWMW ornate/:0 W Darrow“- B. a [M eta/w c. raw 3 [34 0113 Orr/bf” 6 ChemlOB Fall 2008 ' ' Exam 313 December 4, 2008 Name 7%? Section SHOW WORK FOR ALL PROBLEMS VII(5) Determine the KH for an acid when a 0.294M solution has a pH of 2.80. nun J - flmgoc—goufl 7{=“°J73’” [SH/L? J / A x V 0.00/ . A: .ZW-x 3‘ (dag/"005?) -2.5’O -‘ 7%; 2-5") [7430’] 3/0 c: 9: 00/5?” 31%] Answer ftflfl/flflé é onyx/0“” ' Emma/0’ “W 5‘. J“? #204” VIII(5) What isthe percent ionization of a 0.33 7M HF solution? 7 FN/m (fine [xi/JFJJ’J‘NV" ; 3 55005177 Z: ’W’J‘J’“ xix/w 'ymxdgoségwm“ .251 0» ,~ ‘ - [it/VJ ",0/(14’4: My 1 K v - "f '- 4'33?’ X a: a! ‘ 3.5!!" *2 337» 7 5/.33?-—K K Y‘ ' :g'z’zz o X: a (NOELH Answer 3:2. 20 m5) What is the pH ofa 0.350M solution oszHsN? KL 3, /, 9299-7 Jami] er/{MJI‘ Info .:' gfl/{J/I-lu 00/ " K!) J [ngAJ/J'Jiwlj Z :35?) x [cg—4w: '9 a —~.c x 4 (XJt’x) x:[m‘]:g,s/<{w / W71“? 5 . W q. 4/ 4” ;35‘v.—~.c X 7" 03172—15 7 -— 4/. Answer 2g:- E1552 X(5) What is the pH of a solution that is 0.05 8M HF and 0.075M in LiF? ’S/AIF zljhx’o'g Ozflflwfiogfiéo",fln ' CA" . QWCEF‘V”: ?/‘/-3 /03 if - g / (fear) ‘2’ iii/’0‘?sz 3‘ a DJ- I 149+ JQom) f] 23,46 7‘ 6, [-12 NISWTCI‘%W) ' - («0ng 9.35:} 7 ) KOSqX/a—J: i 4 ' X7Z/r‘1/30’3 “3:37- Q/x/é 7/4 331$? 4 ...l (31161111103 Jinx /.fléé)(/0 M Fa112008 (1 Exam 3B December 4, 2008 A 3. f, (3.76 hid W Name K % ' Section XI(5) Determine 1e wavelength of the photon that is emitted when an electron moves from the n = 6 to the 11 = 1 level in a hydrogen atom. The A constant = 2.18 x 10” 18 J sec. 1156.62): 10*341 sec 23/, 95‘; x10 7”" /?;(ééaxm‘”i}3& )QWWOeM/J /db7i"£$1wr‘m: ’4 3%; I (ZJ/VX/Q‘IJ’J) .—. 974/? Md?” (—5; 4.1) ' 3 £5 ? 2 )W" 8m 3 I "4’ 6“ - 0,12. 1-,- zfiz‘ ,4) ,, /o0f}’X/Vm" 4"?) =J-nqwrt’r —~ A n}, n} r a [:3 £1) Wgfi [:73 if: Ix: é Wavelength 5/0”?!” ' Z 7* L" a £3? X/d‘g’m XII(6) Complete the Lewis Structure and determine the formal charge and oxidation number on ' theIin the ionICh’. zzo’ F61: I‘d/Wad» E. “V‘Apebgfi/wt “£1de15, 9“ SHOW WORK __ Fang: 7 ,._ é- “ I "" w“! —-\. Z g —' {IQ—LCM] . DUraJt/wna flat-Malawian: ~8wéemmer’U . ~ :1 7 -- é -* O 1-3 7"] I 5’0! -> ‘5"); .‘. %wfltif 8'“ [9.8 (Mar 2‘0 LQ Formal Charge "“ I Oxidation Number A_'/"__L__ XIII(9) Draw Lewis Structures for the following. Include the number of valence electrons and indicate whether or not the structure would have resonance forms. (You DO NOT have to draw - the resonance forms) Central Atom is underlined. ChemlO3 Fall 2008 Exam 313 December 4, 2008 Name Section EXTRA CREDIT (4)For the following reaction: A + 2B -> 3C + D the following information was collected. X Expt. M“ [A] [B] W a. Eff/Li U31 7' number dr H l Ilvmt Wfllmt 0.0382 0.040 0.044 0.0382 0.040 0.015 FWF’Z' 103492 J’ECMVCUVY)‘: __.___——:v a. apt? .ozaz 4 (Maya/fig! / $2.75)} Determine the order of the reactants A and B fen/'2.._ 0.0392. 9 *éM-W‘fl W'Wi‘i :11 w O T”, fl M 5 . I y ' Fla} c 5’6 all? i fi( 020) J L0“ Order with respect to A ___"_3____ 8 :2" 5‘5 9’ :32 Order with respect to B _Q__ X 5 7 (4) For the certain-reaction the rate of the reaction quadrupled when the temperature of the reaction was raised from 200 0C to 300°C. What is the activation energy in k] of this reaction? R=8_3'14J/11101K” 462'; q aziwfzflgg 6.74, A {In if} {a1 73,2.402223w‘1’73 % ’ 12- 72? 7f I K .- "‘ -. l 5' 3}! 4m. {,4 -1. __ 4.- 344% 4/2444 J‘ a c “ '- 6'25 :13 I I gull/$4?!“ 4 Answer nip/34 >00 VJ" POINTS I /é 072 31,24 [647" g Page 1 Page 2 Z ?’ Page 3 i Page 4 i Page 7 .32 Q Score $4 Page 9 8? / _ - 128 ...
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This note was uploaded on 03/01/2009 for the course CHEM 103 taught by Professor Kramer during the Fall '08 term at University of Delaware.

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Chem103F08T3 - Chem 1 03 Fall 2008 Exam 3B December 4 2008...

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