PracticeExam1b - Chem 202 Hour Exam I from 2007, Now...

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Unformatted text preview: Chem 202 Hour Exam I from 2007, Now Practice Exam "b" Prof. Gruebele Chem 202 Fall 2007 TA: Hour Exam I 10-11-07 Section: PAGE 1 Name: Signature: Student ID No: Instructions: Name: Quiz Sect: TA: l you are told to do so; inothbemeatheme, filluntil youfare tationo do so; in the meantime, fill in the information Do n t e gin nti exam in the in o m old t requested below. ltiple choice questions (4 mtidterm and onnsword problemhoice tquestionsi(4you.r ea.) and one word problem (16 pts.). Fill in your This p s. ea.) contai e 21 multiple c (16 p s.). Fill n pts o., quiz section and TA name above. , On the bubble ,aquiz er sheet andiTAhname above. On the bubble answer sheet fill in the same name, signature student ID no. nsw section fill n t e same two digits of your quiz sectionormation;cuse " antd foldow inofryour nsuiz section under "class" and follow instructions on the type of nf under " lass the wo l igits st uctio q on the formation may delayboard. g of youtoefiam. all information may delay grading of your exam. gradin Failure r x ll in f the exam; however, Ynlymaubwlritefilned in part he ahe wxam;ehowevecount asbubbles filled in on the answer sheet will count as credit o ou b y b es o l any on of t ns e er sh et will r, only credit ions; only answers written in the boxed spacquestions;eonly the examwrittecoin the boxed spaces provided on the exam will count for the multiple choice es provid d on answers will n un for the essay question. swer sheet at the endTurn enhtour.examrand hhe ork, use sheettht tlhe se shefethe hour. For rough work, use only the loose sheets of th i he For oug t w answer only ae oo end o s eets will not be counted. The exam bonklet wisheetrewill ed to you during quhe exam booklet will be returned to you during quiz provided. Work oo loose ll be s turn not be counted. T iz on it if you want a personal recircle(bubblanswers on lit NOT be retuanpersonal record (bubble sheets will NOT be returned). section; c ord your e sheet wi l if you want r ed). 1) Indium oxide contains 4.784 g of Indium for everyndiumofxide contains 4.ormulaofor Indiumor every gram of oxygen. Th 1) I gram o oxygen. The f 784 g Indium f is most likely: most likely: a) In2Ob) InO c) In2O3 d) InO2 a) In2O3O2nO e) In b) I c) In2O3 d) InO2 (i) Consider the multi-use compound quinine, which Consider the multi-use compound quinine, which H2 C=CH H is used as a Schweppes tonic water flavoring, but alsused as a Schweppes tonic water flavoring, but also is o as an anti-malaria agent: as an anti-malaria agent: H In question 2-4, what hybridization best describes In question 2-4, (iihat hybridization best describes w) HO N the atom shown labeled (labels refer to N,C or O, the atom shown labeled (labels refer to N,C or O, not any not any H3 C H's that are not shown) H's that are not shown) -O (iii) 2) atom ( i): a) sp3 b) sp 2 c) sp 2) atom ( i): a) sp3 b) sp 2 c) sp 3 b) sp 2 c) sp 3 b) sp 2 c) sN 3) atom (ii): a) sp 3) atom (ii): a) sp p 4) atom (iii): a) sp3 b) sp 2 c) sp 4) atom (iii): a) sp3 b) sp 2 c) sp (ii) 5) Which of the following orderings is in terms of5) ECREASItNGfradius? orderings is in terms of DECREASING radius? D Which of he ollowing a) I, Br, Cl, F b) F, Cl, Br, I c) Br, Cl, F, I d) Li, BIe,Br, F l, F b) e) Coth a, and dBr, Cl, F, I d) Li, Be, C, F a) , C C F, b l, Br I c) 6) [Ar] 4s23d104p1 is the electron configuration of [Ar] 4s23d104p1 is the electron configuration of 6) a) Gallium e are 4 pages of questions. 1 hour; there are 4 pages of questions. Exam time: he board; organizeTimestime carefully on the tboard; organizexam time carefully by first scanning the exam your will be noted by firs scanning the e your swer, then going bfor questions youscan answer, then going back to harder ones. ack to harder one . b) Zinc c) Aluminum d) Potassium e) Arb)nic a) Gallium se Zinc c) Aluminum d) Potassium e) Arse 7) The effective nuclear charge Zeff of Beryllium,7)sing the approximation harge lZeff ofis?eryllium, using the approximation u The effective nuclear c from ecture B a) 1 b) 1.5 c) 2 d) 2.5 1 a) e) 3 b) 1.5 c) 2 d) 2.5 e) 3 8) Which of the following makes the most polar diatomic choleculefbased on electronegatiost pdifference? ic molecule based on 8) Whi m of the ollowing makes the mvity olar diatom r any equations orReferbto the t giveheet tfor qnysequatitons you umbers not given in the questions that you num ers nohint s n in he aue tions hat or n might need. a) BeO b) N2 c) NaI d) NaF BeO a) e) can't N2 b) tell c) NaI d) NaF e) can't 9) Vision pigment contains the molecule retinal; vision startpigment contains theamoleculehoton byvision starts with absorpti 9) Vision s with absorption of single p retinal; the molecule retinal, which causes an electron in retinal to jump etinah,igher hnerusesean electron in retinal to tjo molecule r to a l whice ca gy l vel, eventually leading ump to a higher en transmission of a nerve signal. What is the most likely difference a nerve signal. retinal isnergy levels, given ference between transmission of between these What e the most likely dif that visible light has a wavelength of 500 nm? that visible light has a wavelength of 500 nm? a) 1 J b) 4 J c) 1.10-39 J d) 4.10-28 J e) 4.10-19 J b) 4 J c) 1.10-39 J a) 1 J d) 4.10-28 J e) 4.10-19 J 10) A particle in a conducting cubic 2D box has energy lparticle in h2c(nx2 + ny2)/ (8mL2) for ahas energy levels E = h2 (nx2 + 10) A evels E = a onducting cubic 2D box n electron, with nx = 1,2,3... and ny=1,2,3... A photon that excites nx =e1,2,3... arom yhe secondAo hoton that XCITED electron from th with the lectron fnd n t =1,2,3... t pthe third E excites the state has 100 Joules of energy. What is the energystateheas round state (lowestgyneWhat is the energy of the ground state (low of t h g 100 Joules of ener e . rgy state)? a) 20 J b) 40 J c) 66 J d) 100 J 0 J a) 2 e) 150 J40 J b) c) 66 J d) 100 J Chem 202 Fall 2007 Name: TA: Hour Exam I 10-11-07 Section: Chem 202 Fall 2007 Name: TA: Hour Exam I 10-11-07 Section: PAGE 3 PAGE 2 18) Which of the following electron configurations correspondstto an excited state?on configurations corresponds to an exc 18) Which of he following electr sets of quantum numb11) are not ofloheefollowingroets of tquantum numbers are not allowed for hydrogen atom? ers Which al t w d for hyd s gen a om? -1, ms = -1/2 -1, ms = 1/2 b) n = 3n l = 1,l ml1= m,l ms 1, 0 s = -1/2 a) , = 2, = , 2 = - = m d) n = 1n l = 0,l ml2= m,l ms 1, 1/2 = 1/2 c) , = 1, = , 0 = - = ms e) b and c a) 1s22s22p1 b) 1s22s22p6 c) 1s22s22p43s1 b) n = 3, l = 1, ml = 2, ms = 0 d) n = 1, l = 0, ml = 0, ms = 1/2 * a) b n . * nb . b c) . b * b) nb * nb . c) . b b * nb b * e) d) * b . e) nb * b a) H2S is sp2 hybridized due to larger repulsion of its bigger poneybridized due coouds. repulsion of its bigger lone pair ele a) H2S is s l 2 h pair electron t l larger b) In H2O the H's are not purely bound by p orbitals;InoH2O the H's are not ps orbitaound byin. orbitals; to avoid repulsion, t b) t avoid repulsion, the urely bl mixes p c) The bond angles in the two molecules are the same heithin 2 angles in the two molecules are the same within 2 degrees. c) T w bond degrees. d) H2S is larger and full sp3 hybridization is not neces2Srysto yield nd fobsspvehybridization is not necessary to yield the ob d) H sa i larger a the ull er 3 d structure. e) b and d. e) b and d. 20) Which of the following is a reasonable profile20) W2s wavefunction? for a hich of the following is a reasonable profile for a 2s wavefunction? # # # a) b) 0.5 c) 1 d) 1.5 e) -1 c) 1088 d) 11a) 900 .3 c) a) e) Not)c799ulable wic) 1nformation d)iven b alc th i 088 g 11.3 d) b anb) c d e) a and c e) Not calculable with information given c) d) b and c e) a and c g is not a useful symmetry cWhich ation when constructot g mseful sar metry combination when constructing molecular 16) ombin of the following is n in a u oleculym tals? orbitals out of atomic orbitals? c) d) a) e) allb)f these are usc) ul o ef e) r r 21) Match up only correct combination of highlightedMnergy level, qcorrect combinatiandof highlighted energy level, quantu 21) e atch up only uantum number, on x-p plot from the choices below for a particle in a box with rom the choices Hint: Tfor quantum number iswith springy walls. (Hint f springy walls. ( below he a particle in a box an integer that works with the hint sheet version oanhe feger that worksswith the hint sheet version of the formula for the f t int ormula for the pring.) le, which of the followin15)sAccording so pounid'serune,rwhichcoron e oolfliowration? ot a lowest possible energy electron configuration? g i not a lowet t H ss bl e l e gy ele t f th c f n gu ing is n b) r # d) finity of B+ in kJ/mole? What is the electron affinity of B+ in kJ/mole? 14) 99 c) r # order of a single one o13) e n 12, ondst?is the bond order of a single one of the HF bonds? f th I HF b wha a) 0 b) r b d) 1.5 e) -1 d) [Ar]4s1 19) The differences in the bond angles of H2S and H2The difbe rationalized as follows: of H2S and H2O can be rationaliz 19) O can ferences in the bond angles F- molecule (fluoride solvaConsider dhe flinear FHF- inoleclogy flo OH- ssolvated by hydrofluoric acid, in analogy to OH- solvated by 12) ted by hyt ro luoric acid, m ana ule ( t uoride olvated by orbitals are bonded wiwater).cThe al hyfluorine assume eacareluorine with the central hydrogen; assume each fluorine th the entr two drogen; pz orbitals h f bonded 1 electron, all other eleczrorbital Fnitially paired int1 elecbondiall other electronssin F being paired into nonbonding s and p orbitals; p t ons in i being contains o non tron, ng s and p orbital ; ccupation is added in the midwlith which electrondoagramtion is escribeis tthebonding which orbital diagram best describes the bonding an H- d e; a 1s2 orbital i ccupa best d added n he middle; nb = nonbonding, b = in Fding?o(r* itaantibonding, nb = nonbonding, b = bonding orbital) bon HF- b = l) b) a) 1s22s22p1 b) e) 22s22pf them s22s22p43s1 d) [Ar]4s 1s none o 6 c) 1 d) a) IV, 0, ii E b) II, 1, iii x2 i) c) III, 1, iii E d) I, 1, i V, 0, ii e) II,b), IiI, 1, iii a) I 1v p ii) E x2 x x E x I) x III) iv) iii) x c) III, 1, iii x II) p d) I, 1, i p x I) p x IV) e) all of these are useful roton's position is 10-1517) Thepuoximately, in haproton'ssmalitionpisssible m. Approximately, what is the smallest possible m. Ap r ncertainty w a t is the pos lest o 10-15 ity in m/s? [Hint: yes, you can get the proitsnvmass fromm/s?h[iHint:eyes], you can get the proton mass from the hint sheet!] uncertainty in to elocity in the nt sh et! b) 400 c) 4.104 d) 4.108 .5.10-9 ) 4.1010 b) 400 c) 4.104 a) 2 e d) 4.108 e) 4.1010 First hour practice exam "b" solution First hour practice exam "b" solution key: key: III) e) II, 1, iv a) 2.5.10-9 Chem 202 Fall 2007 b) 400 c) 4.104 d) 4.108 Name: e) 4.1010 TA: Section: Hour Exam I 10-11-07 PAGE 4 First hour practice exam "b" solution key: 1c, 2b, 3a, 4a, 5e, 6a, 7b, 8d, 9e, 10d, 11e, 12a, 13b, 14b, 15b, 16c, 17d, 18c, 19 22) Word problem Only answers in the boxes will be counted for credit. 22) Word problem The molecule CO (carbon monoxide) is formed in the partial oxidation of gasoline in car engines, and further oxidizes to CO2. It is odorless, colorless, and extremely toxic because it binds irreversibly to hemoglobin in the blood, leading to asphyxiation. c) The molecule CO (carbon monoxide) is formed in the partial oxidation of gasoline in car engines, and further oxidizes to CO2. It is odorless, colorless, and extremely toxic because it binds irreversibly to hemoglobin in the blood, leading to asphyxiation. c') d) C O z-axis z-axis a) fill the MO diagram in the box with the correct number of electrons for CO a) fill the MO diagram in the box with the correct number of electrons for CO c) sketch one of the "c)" and one of the "c')" molecular orbitals in the box below: c) C O c') C +2 b) Label all the orbitals in the box in part a as "b", "nb" or "*" for bonding, nonbonding, and antibonding character. d') b) Label all the orbitals in the box in part a as "b", "nb" or "*" for bonding, nonbonding, and antibonding character. +3 +4c) sketch one of the "c)" and one of the "c')" molecular orbitals in the box belo +2 +2 O c) d) What will happen to liquid CO when it is poured between the poles of a magnet? c') +2d) What will happen to liquid CO when it is poured between the poles of a ma It will not stick (diamagne e) What is the bond order of CO? +2 Structure/charge: f) Draw a reasonable Lewis dot structure for CO, and mark the C and O "+" or "-" to indicate partial charge/direction of the dipole moment for your structure. Does your structure satisfy the octet rule? 3 Octet rule? +2 Structure/c tructure for CO, and mark +3f) Draw aOreasonable Lewis dot spartial charge/direction the C and "+" or "-" to indicate of the dipole moment for your structure. Does your structure satisfy the octet rule? :C!O "- ...
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This note was uploaded on 10/10/2011 for the course CHEMISTRY 202 taught by Professor Grubele during the Spring '11 term at University of Illinois, Urbana Champaign.

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