f01_109_ex1-key - Chemistry 109 Name Professors Burstyn and...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chemistry 109 Name Professors Burstyn and Moore Fall 2001 Section TA Exam 1 INSTRUCTIONS 1. This exam consists of 9 pages, a periodic table, and a page of useful constants. If a page is missing, take the exam to a proctor immediately. 2. PRINT your name NOW in the spaces at the top of ALL pages. 3. Part A is worth 30 points. Part B is worth 51 points. Part C is worth 19 points. 4. The exam should be easy to complete in 75 minutes. Check your work after completing the exam. Please show all your work and be certain that all your explanations are given as complete sentences. 5. On the grading chart at the bottom of this page, CIRCLE the numbers of the questions you would like to be graded. Check that you have circled the correct number of questions for Parts A (2), B (3) and C (1). Honor Code: By the definition of academic integrity, the exam I am handing in is solely my 0w work and trathfidiy represents work I have done. Signature — — — —_ _ Name 2% PART A. (30 points) BASIC QUESTIONS. Answer TWO of the following four questions. Write your answer in the space provided. SHOW YOUR WORK AND WRITE EXPLANATIONS IN FULL SENTENCES. 1. Four quantum numbers describe the spatial distribution of an electron in an atom. a) For n=5, give all possible values of 6: OC 4 Z 3 :4 b) For 6 =1, give all possible values of Int: "' 0 / c) How many orbitals belong to the n=3 shell? 9 d) Name the subshell described by the quantum numbers n=4, 5 :2: e) Assign a set of four quantum numbers to the 6th electron in a carbon atom, n=z L=/ mam m5: “’2. ..-/ may" Con-£Cf mama/s wich MAP/m- ‘// MJ" /2 2. Arrange the following in the order indicated. a) From smallest to largest: As, N, Bi, P MID/453; Smallest 9 Largest b) In order of increasing first ionization energy: Ar, S, Mg, Cl M3,S Céflr Lowest IEl 9 Highest IEl C) From largest to smallest: Xe, Sb, Rb, Ru K6, I?“ 56, Y6 Largest 9 Smallest d) In order of increasing electronegativity: N, C, F, O CMOF Least electronegative 9 Most electronegative e) From strongest to weakest: N—N bond in N2, F-F bond in F2, O—O bond in 02 W N's/v 0:0 F—F Strongest 9 Weakest 3. Name Kg Consider the element Fe. a) Give the electron configuration of the Fe atom. [Ar-345230i6- b) Draw an orbital box diagram for the Fe3+ cation. (is 1:] boxes not- messary 3" 1' @qmmm [5 c) Are the Fe atom and the Fe3+ cation paramagnetic or diamagnetic? Few new d) How many unpaired electrons are there in each? Z4—5— Fe F e3+ 3. Answer the following for the molecule CUCIZ. a) Draw a Lewis dot structure, including all lone pairs. 9 ‘ . E E D 6 v 6' Q)“ V' e 1"." - q ' ' H lb (one. pm!- V4, 1 v. e' "- _ a 2,4914 me‘ Q 214 v.8 /OL / \ or 2.1! v.8? M / \ / \ / art fine. Seton. pair-s b) Identify any polar bonds in COClZ, and indicate the more positive and more negative ends of the bonds with partial charges. Botkfkol GLOW tat-«>1. (M, (2—0! bowls amputee: 05' 55* Sa/ \aJ' c) The strongest bond in COCl2 is: C70 (1) Most polar bond is: i e) The longest bond in COClJ is: Ca” Ct Name Z —_ a Part B 035! points) COMPETENCY QUESTIONS Answer THREE of the following six questions in the space provided. SHOW YOUR WORK AND WRITE EXPLANATION S IN FULL SENTENCES. 5. For the following solid substances, classify each as a molecular solid, an ionic solid, a network (covalent) solid or a metallic solid. Au, N aBPO4, SiO2, CQHSO4 (aspirin), Na, CsCl, C (diamond), NH4NO3, CH4NZO (urea), C18H3602 (stearic acid, a saturated fatty acid), Fe, 12, CaSO4, C (graphite), brass (an alloy of Cu and Zn), CmH8 (naptlialene), Sn Ionic Network/Covalent Metallic Molecular Nag”?! 5:07, A“ C9 #30:, (051930;) a (sci. (3(de) Ea caq ~10 care“) NMNO.» CCSWM‘Q bra Craftawz (stem “4°” («55 @5014 5“ 1?. C50 H8 (Awake!) 6. Write an explanation in complete sentences for the observations described below. a) The radius of a fluoride ion is 133 pm while the radius of a fluorine atom is 72 pm. an W 50 finicky— M‘ affaééox-F/Waa W, atajxfj fl b) The element silicon is often found in the +4 oxidation state. Mpg» (OJ/‘7 162/— W’ 525% 5254..“ (6Q W Aaéé, ya.) gap/Va,- W 5Q 14¢ m‘dfip 561.6% gméle. g; 55. c) A phosphorus-sulfur single bond is 214 pm long while a phosphorus-oxygen single bond is only 176 pm long. mu» arm», W61: 2% and, W SulFur 1'.) an (age/- alum ém su/iaf aka/pimpflawfi /oAjV an,» M g; E ,/ £514.65- dxfieh eJW/Am' Name 4 éfif 7. Aluminum metal crystallizes in a cubic close packed structure (face centered unit cell). I . . . floor-aw :1 —- = l a) How many alummum atoms are there m a unit cell? I Q QM)ng 3 five are QM Mumdw... afoms u; 2‘41 Gee, Wm 7. b) What is the coordination number of each aluminum atom? p +0.3 chi/6 . £3.04, a/umr'aum aéwe Am a Wrafiggtég AW 0 c) The radius of an Al atom is 143 pm. Calculate edge length of the unit cell in pm, dflljaha-Igélx (EL =4xf43pp~= i - ‘ nus—[)2 E e (edgeJH (6.013%)? =(digm1f :. W edge - Ur a: A 2d “WEE? PM: drw= v” (1) Calculate the density of Al metal. Express your answer in g/cm3. WW. Drum-é cw =(cd3e)3 : 6.59%10 2pm} 11 3 {0 ,9!“ 26.98 M w) = ,2 :22 3 4 AW»: ngéflér-h x ~——-fl—" >‘ 00 CM ' __ M x 2 {023aWA{ bud/4f 3 asMHoapMs 6.02 x CM 8. There exists more than one compound With the formula CZHGO. a) Draw dot structures of all possible isomers with the formula CZHGO. Use bond dashes to represent bonding electron pairs and show all lone pairs. H H H H f l / ,. l u~c—c-0,;-. wow—4'” f- I H l " ( H H {-1 H b) Can cis and trans isomers of the formula C2H6O exist? Why or Why not? or- No Mare 00 ca} ézru AM of OLA/ac) Mame {Awe/3 / "' fi- nfld W(;6szmu/{. 5 9. Answer the following questions about the compound N20. a) Draw all the possible resonance structures of N20 (One N is in the middle). I, (I _— ll :szzo: Nam—Oi :N-‘Ngo: I _.4 O .- ” l "H O l “2 0 +‘ b) Assign formal charges to each resonance structure. Can you eliminate any of the resonance structures on the basis of formal charge? Why or why not? Shad cite 35 The west beneuee H’ has. litter??? “Elegant chm: e C- Q on NB Mai 01. pfifii’l’ifleIfiEmeml (Ll/1:3. {5'6 cite tagger more Electreneqefig‘e elevates-at Structure C) if: phlegm mine Cg Manatee: @ has Hm narrative want aha renew the were. elee‘ém 14 active gtovu, (0‘), Q C) Given he following bond lengths and your answer above, explain why the N—N bond length in N20 is 113 pm and the N-O bond length is 119 pm. N—N 167 pm N—O 147 pm N=N 120 pm N=O 115 pm NEN 110 pm Th .7 NW bowl. ienq‘tfi. between a mutate band}, 5 Mi?! 0L. lit/lfiflt (Hagan) _ _, . 1 PS “the best ticket/t, “flue banal» P I araaaia be cloaee tn triple?) ctr/10M“ :e, ti a1) heart lemma is Patna-Effie: singlet (W7 CAM alanine (Hg) pm) which net-55g truffle gfifm fixed but? H“ l‘3 H” m ' ""1 a i ., {2‘ {mater be FF Q "r ' étm Clix tar 10. Name /@ Consider the element nickel, whose emission spectrum exhibits a line at 212.59 nm. a) In what egion of the electromagnetic spectrum is this line found? (Circle the answer.) __ ultraviolet} visible infrared microwave radiowave b) Whats to frequency of this line in Hz? fl» . riflqugats“ tar; W9 it? wait-3% iota mi ' 4m ' c)What is the energy difference between the two levels responsible for this line in kJ/mol? as @iéawflhfimm xi .5 £1, WCZMWQ K» gr I new {gr}; 1:? the! ’ _ =3 a M?! r“ it? if Wt >< m x "“' d) The ionization energy of nickel from the ground state is 757 kJ/rnol. Assuming that the transition at 212.59 mm is from the ground state to an excited state, what is the ionization energy of the excited state in kJ/mol? 7'5 7 “we!” -—-' 5G3 term"! -_-.-_.. 1634 £ani”‘ Name i [/fl Part C (19 points) MASTERY QUESTIONS Answer ONE of the following two questions in the space provided. SHOW ALL YOUR WORK AND WRITE EXPLANAT IONS IN COMPLETE SENTENCES. 11. A fourth period element has the following ionization energies: IE1 = 631 kJ/mol IE6 = 10720 kI/mol IE2 = 1235 kI/mol IE7 = 13320 k] / mo] IE3 = 2389 kJ/mol 7 it,wa IE8 = 15310 kJ/mol IE4 = 7089 kJ/mol N; IE9 = 17369 kI/mol IE5 = 8844 kJ/mol 1E10 = 21740 kI/mol 3) Give the name and symbol of the aementénd writ; its e1 ctron Cfnfigurebtion. a it... i u" a.» Seated; LLWL £3 £5; 4-5 b) Write the equation of the process for which the energy change is IE2. Write the electron configurations of the product and reactant ions below the ions in your equation. 33c l fiew +- e“ AH e/Jss‘éj‘ml' {Arizd‘ats' {Ar-331‘ ' d) Explain, in complete sentences, how you deduced the identity of the element. - The ihuiti‘h is {Mel/i bigger- W‘d Mirdffi: Fl sudden inc merge in IE??? new 5» in be} no re nee “Pm we in. gable”; donfiqurztsffto probably a, he We egos confidee”d“i'£¢tft.,“Se 34615 +51 M e elee‘trdns The {Leniitqde’oiid Pidt‘ifiéfifi £3? "ie‘syxotl Nameflm 12. One of the four compounds, IFS, SbFfi, NFfi and PFS is unknown and is unlikely to exist. Why? Answer this question by drawing dot structures of all the compounds, and describing the filled shell configurations attained by each central atom. 42 a“ (Minna? , 4 I EM 5f «flag? "he info ‘ é clues mt wear“; at: my ‘33: I“; 9’ i Z "3”? w i: ...
View Full Document

This note was uploaded on 11/18/2009 for the course CHEM 109 taught by Professor Keutsch during the Spring '07 term at University of Wisconsin.

Page1 / 9

f01_109_ex1-key - Chemistry 109 Name Professors Burstyn and...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online