FinalExamReview_AnswerKey

FinalExamReview_AnswerKey - There are some typing errors in...

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Unformatted text preview: There are some typing errors in the original review that I have corrected here. I apologize for the confusion it might have caused. Good luck. CHEM 2070 FINAL EXAM REVIEW: ANSWER KEY 1. Copper reacts with dilute nitric acid according to the following equation: Cu (8) + HN03 (aq) -> CU(N03)2 (aq) + N02 (g) + H20 (1) A copper penny weighing 3.045 g is reacted with 50 mL of 0.65M HN03. What is the limiting reagent? To the resulting solution, 30 l’IlL of water is added, what is the molarity of the resulting Cu(N03)2 solution? it Moles as} lat—mo?) = mos—0L x 0.Q§Ma‘ IL. :O'OEZngM-Si H’N‘O; infill/u. ICMt‘HMQ? «(awry-xi"- r 1 Cu NZ) atmbla Sf (home); :0'0513wwl W3 x _“‘°_l___(__})1- 1+le W03 ; tw’xto'gwel Téhdspl ValuUu—L : OIOSTL+O.030L_ :O,O%QL‘ 3 Mbi . to“ Lokwi‘tkh'bv‘ Sb acmz’)1 '= 8 tax L 0-080 2. (a) An ion has a single electron. The longest wavelength of radiation absorbed by this ion in its lowest energy state is 7.60nrn. Identify the atom and determine the minimum energy (in units of J) required to completely remove this electron from the ion in its energy state. (b) H atoms in their lowest energy state are irradiated with light of frequency 3.510 X 1015 Hz, causing electrons to be ejected. Calculate the de Broglie wavelength associated with these electrons. Express your answer in units of the Bohr radius. (0") TVAMleV‘ M¢l Kn??— @7'é.c; “Nag s4» E=ln=___l’“—= * v u q Zia-HC “3 14¢ a a (—fa— - 3:) (1-GOXI0’Q)C2¢7 ‘? xzo*‘&)CS/¢) . 3+ , SfLLA'JA La b E, 2 .. (3 3' \ - ‘ .. «,5- Av :1 (éwé'LéXfO sqIB-S'IOKID 1+ atomic liq, Effiol—on '= e 2. 524. XIO‘IEJ :- tf'hc h'c._ 7' ' Er’ou-IZKFI‘W Exam Emu—3‘1 F‘- (- l”? into—(cl 5 Va 2 20.47Kt0'fi) : 51,3 KIDS “of; (74mm ‘3') 3. H20 CHF3 KB!” CH4 C02 Arrange the above molecules in order of decreasing boiling temperatures. Clearly state your reasoning for your answer. K51 > Hzo > CLH'F3 >CO; > 6541(- Kb)’ 5 Cor/HY; (awowaeflkgym Guyl’é—Q (09 4. (a) Draw the Lewis structures of SCN~ and N021 State the possible shapes of the two, the hybridization and whether or not the molecule is polar. Do any of the two have delocalized MOS? If so, then draw the delocalized MOS for that molecule. (b) Si is doped using As, and on another occasion doped using B. With the help of diagram illustrate the differences between the two. 63.. ‘ ‘ epQ. :g-c—EM: MW, 51? waa‘flj’ ,. U 1/ Waitch . Q/N§_ (__..> '//g\e Baht? M26 30, F." 'O.~ 9.3 C9 QSKEJC—gk <_—-——*> 872%:M E : mat)” a Q Azlocfiuiagz Mo; % g 8 O wage-4U) 5. (a) Draw the molecular orbital diagram of CS' showing clearly the combination of atomic orbitals (A0) to form molecular orbitals (MOS) in the diatomic anion. Fill the levels with electrons and label the AO’s and the MO’s. (b) Mark the HOMO and LUMO levels. (C) Is the diatomic anion paramagnetic. Explain your answer. (d) Sketch how the A03 bond to form MOS in the above diatomic anion. (e) Draw a photoelectron spectrum of the above diatomic anion and state whether the bond length will increase or decrease on removing one electron. as‘ = bra/l a} we," 1;. W‘s? __\ 11* ‘ \ a 4 ’ ‘\\ '—'_"‘1- e .10 AL 1.. 2? "'\.-_k;‘:5&:rw ‘3: er“ .414... - 62‘"; 2.5 i a 1 4V \ 3:: ‘Q ‘jl'r’ c. Cg, 5 C6) WM arr Low ' 6* 6. [Co(NH3)6r3 [CoF61'3 [Ir(en)3]*3 tRh(NH3)6]” C A B D [PtC16]‘2 [Pt(CN)4]'2 [Nic141'2 [NiCl61'2 E F G H (a) Arrange the complexes A through D in order of increasing d-orbital splitting. Explain your reasons for the order you proposed. (b) Which of the complexes A through D will absorb light of shortest and longest wavelength. Explain. (0) Arrange the complexes B through H in order of increasing number of paired electrons using crystal field theory. (F has a square planar shape and G has a tetrahedral shape) (d) Show with the help of a d-orbital splitting diagram the number of d-d transitions that are possible in complexes F and G. _ 1+3 +5 1*? (a) CF61!“ < atom—3);, < ahCW0£3 <1"tr C“): 7—“ "‘ A—E' __#__ "—— Dre AET________”T_______ _________ _,,_______ L——-—-—~___.l ng 7. Draw all the stereoisomers of [C0(CN)3(NH3)(H20)(CO)]. Circle any isomer that is chiral and has an enantiomer. G“ MD a, Lot) unit?“ 00 0‘9” ‘ \“ “w w \ H19 1 ‘6“ ICO‘ aha“ um! "H3 1 0" w/l \w (.61 ON ON ('-“-“w7—%_"_H~ r 9H3 : m ‘1 l w 1 “1° I '0, ‘-‘ t m0""o“"w " a» ' Why/«rs / i. y / l an i gmw‘fi ‘ “” ‘ CH ' w 0N I "z 1 \ OJ ft I \ i, _ 5— - _ —_ fl .1 8. NH3 gas has a density of 0.6942 g/dm3 at 26 °C. (a) Calculate the pressure of the gas in mmHg. (b) The NH3 gas is mixed with an unknown homo-diatomic gas. It is known that the unknown gas takes 1.37 times longer to effuse through a porous plug as it did for the same amount of NH3. Identify the unknown gas. (0) 2.3 5L of NH3 gas is mixed with 3.17L of the unknown gas that is at 728mmHg. If both are at 26 C, use your answer from (a) to calculate the total pressure exerted by the mixture. (d) The temperature of the gases is raised from 26 C to 62 C. Calculate the increase in energy of one mole of each gas. (e) Calculate the change in urms 0f the unknown gas due to the increase in temperature in (d). Lax-Hus ‘ <09 3% LS“; . Fl CG’I'MO’l H ~ o 51017an W -, Q‘SSMMHQ' lac-HM- _+r'w< .mk._ [.37 hams} . NHL bfib I" H l/‘MM—o 'c'c'“+°mc Mum-dc: BZG/Mbl 4-"- 3% (c) :Daurm law: 81' RLHJZ W1 2.3§L ‘. l X :- ' pm 758 mama SELL 32.?) MRS P0 728’ wchH'? X ; Lf|% mml‘l'a a =%-3l‘+3 moi" L” '26-mil’b) % BKKM agave-ad: T 4m K‘M" _ -\ L: g-EIWCSMIlF- T1 :(éz +L‘? 3) \C‘ (a) Copper has a face-centered cubic structure. If the radius of the copper is 156.5pm, what is its density? (b) A diffraction spot is recorded 75mm vertically displaced from the center of the direct X-ray beam of 7x: 1.06 A (where 1 A= 1 X IO'wm), 150 mm from a crystal. Use Bragg’s law to calculate the atomic spacing in copper MM +9.2. balms/W MAICC smz- 70v» ’5' CLM Fee 2 339" Lt? =HX am A 6f “’9 law ) L: ‘1‘? _ W Milo: ‘5? x a” M J - fl , I, FA «5 2 -. .2; Valium—o. V gall)- é) +<1Lg>k3> :- l4r cal—bw—SCK' term lmol X 435.6 4. came *Lhwu I MM 2 if 2x10"; , d '5 2?: .. Mtssbrw) law -, 8.43., No. Volwmp ,Qa_ fl X “for” Mesa = a, 4 36: firms 10. Dithionic acid has a molar mass of 162 and composition of 1.243% H, 39.55% S and 59.20 "/0 O. (a) Determine the number of molecules in 2.00g of the compound. (’0) Determine the empirical formula of the compound. (c) Determine the molecular formula of the compound. CE: 9 o Hm .‘n (003 H.933 31553 91.20:) it moles (.593Mo| "Hibwl 5-70 Ml Yetta-c: [ I 3 EMT'“C“ 2‘ i; 2 H503 CCL) Mm 5]» H503 = 8i . (HSOJ’DO‘ 8lm 3 l4?" , m = 2— ...
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This note was uploaded on 11/06/2010 for the course CHEM 2070 at Cornell.

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FinalExamReview_AnswerKey - There are some typing errors in...

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