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classes%5Cfall08%5C20A-1ID10%5Cpast_20A_final_soln

classes%5Cfall08%5C20A-1ID10%5Cpast_20A_final_soln - Name...

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Unformatted text preview: Name: i.d (important) TA section: Final — Fall 2002 - 20A Questions not ordered by difficulty — so read the whole exam. Also, put stamps on back of final if you want us to mail it to you. Possibly Useful info. h=6*10'34 * Joule*sec Gas law: PV=nRT, R is a constant. Hydrogen atom energy levels: E(n) = —13.66V/n2 eV = 1.910491 speed of light: c=300,000km/sec electron mass = 10'30 kg sqrt(2)~1.4 Typical energy of a single covalent bond: about 5 eV. Coulomb-energy: b*Q1*Q2/R; if Q and Q2 are measured in terms of the electron’s charge, and R measured in Angstrom, then b: 15 eV Ca CvM—S :5 EU ea norm. 8am. am:— 3. 5 t0 3 DEW—«n 2%. hr.— pm "we" «.8. 5.3. 3.8. new: 5— «0 «~— 5. 2. 2. up 2. 8:: flung 8a. 3— 3 n8. 3 «8.. .35... 8.: .5 F 3 «N m.:oEo_m :oEmcfifi. 5” He— v 9.8“ w: a. :4: to 3 h a. M. 3n: :0 an S. a. E E. :3 w"— ”:0 muggy—m 2: he :oznuEmma—U 9:520.— Name: id: Score (max. each question: 20): 1 Total (1) The reaction 2A+3B——> 3C+4D is done in a balloon. Initially there are lmole of A, 1 mole of B, and ALSO 1 mole of D in the balloon. Let’s assume that all are gases. Eventually, when the reaction is stopped. 0.2 moles of B remain. A male; (i) Find the final number oilA, C, and D. ”-3 Male: 0‘? E rcac‘l'ed So --) 50m A rcac+eJ)50m c: was 'FomeJ/ and flew)“ a€3 __A> : a S3N’A reached? 1-0-53 3&0 V7W) A mm'h’ may: 0 W45 1(0va moles! . fl.S'M0|o‘F6 3mm) 3 0.37”, c 40,”; a—tgaz mo} 6 chw’n) 3mla 0 Brno} 61‘ B< HWID) /. 07 ”46/ 0 (Canada /+/.07 [email protected] Brno/B (ii) Assuming the pressure in the balloon did not change, and that the temperature is unchanged either, use the gas law to determine the new volume of the balloon. D/dn Ll Cor/er 7% 1'5 (37 (2) How do you expect that the gap between the lowest occupied Pi orbital and the lowest unoccupied Pi orbital to change as we increase the number of intervening (CH) groups for the series of compounds 3M5 W Six elcglrons ln-lkL ' b CH2(CH)2CH2 fix fr 0’ )0: system “H ' I 1A ' +14 '5 6m 5' j CH2(CH)4CH2 f- Ld 5 he ' / : / \ \\ # l CH2(CH)6CH2 ; TIM. have P; bonrb’} more wife/kw} W97 /eveb etc' 50 4144 JPac/nj or 3949 beam/m +1,le J65 Your answer should include a plot of the orbitals (wavefunction cross section in some convenient plane). 01(' COQQ‘L, fifsi' in”) {u Fro/@0124] Lower)’ ~ Mal-{Q ,IW Wave} Bnyfl; unoccupied Ma) co a-r or: f-haJ ¢ .au. ‘+ r '+- '— + " dagggg Hong ”'7 L + + " "‘ + '7" 71244 noace; Heme Occh/ed ii Malecu/N' Orbi+fll f] l +— + + + ,4. + + Na Molds, Mrgcsvl WAVE/enjfl‘ Maven" energy (If) MON gpaé‘ (3) The ionization energy of elementA is 3.2eV, and the electron affinity of element B is 1.7eV. (i)At what distance between the centers would the energy of the ion~pair (A+ B') be equal to that of .thc neutral ions. A plot of the potential energy as a function of position may be helpful. '1 ' 44 6? flevf; .gm- EA(’>)- 5% "0‘ a; —> 3'laV '- ["7”] " Kim/Au f: a 4‘ ‘7‘ 7 ,aqt/ : if! ’4 _. f‘ If t _ 11,40 - 03/: (ii)What happens is this distance that you just found is larger then the sum of the radius of A and the radius of B; what happens if it is smaller. Think about your answer. If #12 33am our; +41 maid of A W) B L: [(55 131a»: R16 film/4 «May -Tfmw an am Maw par?“ {75 the M of “W rat/ii 0% A m! 5 [571mm flow Rf Hm ‘f’lw/ rmmh CH 054M Moms, (4) Draw the molecular correlation diagram, and plot the highest occupied molecular orbital (i.e., draw H: ~. the cross—section picture, i.e., contour plot picture) for Cl-F. #0 3‘ \‘ i" ' S4 clwn I: W3 1|" (1* u” is 4-}— \ Cl ‘—-Hr' 15 M F ' 6 (5) Suggest an experiment to separate 160 and 18O isotOpes of H20 . Your experiment may be multistage or not, but outline the important steps. lo’ / , / I kc: 5&fome ”0‘55“ 0W7LM 0 AM YO ximfiafes bw'” cause 74% ro‘fadl'onm/ W V’IéVfif’lm’t/ QXC’VML’Z’" 67109)}; 4-0 Le pV'f‘YDeAre/n'f- WC Cat/7 Shlhe wot/3h ”547/ 79 @0316 jUj‘l' 0M. O‘F 7th WIWI‘5- We Can finer) )51/7‘74144 WJQCU/e) bu;")'lq a 54W”? float Caz/.3137? 7976 Q/XQVLEJ H20 m/ew/es p710 pillage/ode. ...
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