C112H S10 T5 - Chemistry 112 Exam 5 4 I ’ ’ ’...

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Unformatted text preview: Chemistry 112 Exam 5 April 16 2010 4] I ’ ’ ’ lll'emellwm Bohr Eqn’s: E = -( szz) Ry , Ry = 2.18 x10"18 J R = (11%.) a0 a0 = 0.529 x 10'10 m h = Planck’s Constant = 6.63 x 10 '34 J -sec 0 = speed oflight = 3.0 x108 mfs 1 cal = 4.134 J R = 8.3 J/mol K No programmable or graphic calculators are allowed on exam. Show all work for credit. For use by grader. 1. 2. 3. O _____Q__ L71. 4. 1. In the space below write out the complete electron configuration (do not use abbreviations-start with 15 and build up) for the indicated atom or ion. Also indicate the number of unpaired electrons present. Rh 2’(neuti'al atom) lg? 29%? “'55“ 3f: <16: 8c] ”149592 Rh+4(a plus four cation) 1;:ngsz yams? 3a [04Fb6g040l number unpaired e- 5 2. 0n the axis shown below, draw in the indicated orbital. Show the presence of all signs and clearly and definitely Show the Sign of the wave fimction--positive or negative for each lobe. i 7 My 3 (132.3;2 3. Anange the following elements in terms of decreasing metallic character: <-;——~—- /F{ Sb, In, s, Ba, Se: manic F r‘ least metallic 4. Arrangeth wing isoeleetronjc series in order of Increasing radius. )VMD’l/eb L-v-‘urorvnsr i (liner smallest radius Twig yr); 1‘ _ y ‘ ,.-61W ‘6 . 1.: I 4 A hxjrogen atom 1n the n2 6 level _em1ts aphoton of wavelength 7 46 x 10 meters h J .7” when it goes to a new level. Calculate the value of n for the new level it went to 15.7171451145thV "‘ show all work for credit-no credit gwen for just an answer. I; K‘j 2f: P9 “If": 7‘: '7 Lila x10 E: hC‘ 714’ W '34 q.) _,_ a b Eifli_mfi,3“0 == “air/{5L0 x10 603 7-"? aw {O’Brn - GO 1 I 1 A H___ w Luger? T“’2.l¢oxto %( [:51 F35) ./' I' (f Y a o 9-,: “7/, , / .7/ 'J’I- " Ol" __ -— , _. 0.3. far/""— In 5' '- T: Jka / iris-E3 x J. 9 J i'Pa gt M 5 A laser pulse of532 nm contains 2 32 x ml (mJ= milli Joule— — 103 D61 How many . photons are in the laser pglfse ? Show workfor credit. 563;} M} m 13 ,3 Z x [0 I’ll? -; ;\ x155”? E33518 ’ ctr-1‘01” plnotDn‘f- 'n' cs . ‘4; £19“)an ._ . ‘-. 3 , -_.__ \I r J . Y -' ”-Y' l. r . r. iye .. ”’1“: (LS .9“- t we BHOMQOXIO " Plowing— We; :07 A of (5—— @TKQ 6. A metal has a work fimction of 1.2 x 10‘19 J. When light hits the metal an electron is emitted with a velocity of 8 x 105 metersfsee. The mass of an electron is 9.11 x 10‘31 kg. Calculate the frequency of the light that hit the metal surface. @:[,2.xlo"q:t V-—95x109m/9 6'5qixio"§'zoi Ts? . 9 l LW'Jziehov'ge $(q.{¥lorgi)(®filog) e octlgwo’ _{q - Eve Lilla/Ho T eeeamo 34¢. 6. include units ope. (maoax [0,4 8. The atomic number of Uranium is 92. Calculate the chem e in ener of an electron in a U?91 ion in the n = 2 state when it goes to the n = 4 state. 2209. no e3 Arne-4 fire: 9;); — Q2; = — Q .160 X10 C 49 9r; 8. include units : 3HEC€LAM nods j E: or; 5.l+¢§¢?b\0xlo CT 9. How many electrons would be needed to completely fill the 6h shell of an atom ? nib 01.95le- deF gin a; ._‘F f“. 10. The wave function for a Is electron has its maximum value at r = 0, that is when the electron is at the nucleus itself. In spite of that, there is a very low net probability that the fl electron is at the nucleus itself. In the space below explain why that is possible. 1L I ‘9 62%;; T5559 OCCUKS {N THE aura/A Pr! 0F ( 'TH'E grit/3‘95 95:— Y); V P re me om»; new?" (3 ’1 1 #5 Ween-:43» a: a: Li” “.J; ,r, N “h :‘ A Calvary-J Sta. e, 1.3"; in. gem/sec me Mucus It; 9mm. vewmérrd 11. Two famous equations from chapter 7 are that for the Heisenberg uncertainty principle and that for the DeBroglie wavelenght. In the spaces below write these two equations: 11a Heisenberg uncertainty princip. 11b. DeBroglie wavelength _ Cir-C54 '3 k (enatofrk 1A /-" Ax» MAV: 2?? ' '-.'.‘H‘.Cld---i '3“ ("a r‘- S . Circle the type of light that is most likely to cause water molecules to rotate (circle one wer only) .r- Circle the type of light that is most likely to cause water molecules to vibrate (circle one swer only) visible x-ray infrared ultraviolet radiowave gamma ray visible x-ray Infrared ultraviolet microwave radiowave gamma ray 14. In class we referred to the. PK orbital having a "nodal plane". Define in the space below what a "nodal plane“i . lf m Snodal Plahfl- it; (A plane shale» :%0€S rlrougln it-C’ X, 5.31 (Coral N“ “i” .Fr-t .3."- grow, f1) ChEDU‘J the or lyricili? 5; (.5: men 540.005 55] ' bNOD/AL PL ANE- *gorrxyj um 01 W'rxf 9061'} .J‘, .nuunu Bonus Question Do this question only after you have cowleted the exam. It is worth 3 points only. The electronegativity of an element is taken as fixed-but can it change ? If you consider bonding to C, and you are atom X, then the nature of the OK bond depends somewhat on the electronegativity difference between C and X. But carbon doesnLt usually bond to just one thing, but to four groups total. Consider the two molecules Fgc—X and H3C-X and you are element X. You are being interviewed for Channel 7 news and asked to describe the electronegativity of the C atom that you are bonded to. Is it the same for the C atom in F3C-X as it is in H3C-X or different. Circle one answer and explain your reasoning: Compared to bonding in H3C-X, the electronegativity of the C atom in F3C-X is: ' :2) Lfro '02] C; I?“ elower { 4 “\‘b‘... ' ) Tm? e'LeCflche cm n u : m1 "OJL C/erdtew 2'5 was: I “-Ffi‘me W Isa-2TH Beam/3e IN OILOteK Valid CAI-d HM») I’D 13% (Cont-V Lg "i‘e pt?" "3:13: p.L 5"- rdL-V'LL-W'J 0M? MOLE Ebb-CJRDN “i5 (H'- H 507-1“! . EUT FgCF'X PET-AV I B"? A mom; 30mm: 80M) “(HAN chrx Wmcw 1.9 covALemT. {me F“ [9 mORE gschRONewm-NE {7‘ met, a? afifzéPV* ~mN9VEKJ‘iWa PROPEK'UBS. ...
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