THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #4 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 167 WEBSITE.
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1 PROF. JOHN VERKADE SPRING 2005 THIS EXAM CONSISTS OF 3 QUESTIONS ON 9 PAGES CHEM 67 HOUR EXAM II FEBRUARY 28, 2005 SEAT NO. NAME RECIT. INSTR. RECIT. SECT. GRADING PAGE Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 TOTAL POINTS 0 pts 4 pts 6 pts 8 pts 27 pts 5 pts 00 pts SCORE NOTE: SHOW ALL OF YOUR WORK ON THESE EXAM PAGES. PUT YOUR ANSWERS IN THE ANSWER SPACES. THE LAST PAGE CONTAINS A PERIODIC TABLE AND USEFUL INFORMATION. THIS SHOULD BE REMOVED AND USED FOR REFERENCE AND SCRATCH PAPER. DO NOT PUT ANSWERS ON THIS TEAR AWAY PAGE. Calculatrs are nt required and they are nt t be used. They are t be ut f sight. Fr prblems asking fr calculatins, just set up the prblem but DO NOT slve fr the answer. PLEASE NOTE that in setting up the prblem, yu d nt need t islate the unknwn. All electrnic devices (e.g., calculatrs, cell phnes) and papers (except yur test) are t be ut f sight. All bks, bk bags, jackets, caps, hats, etc. are t be UNDER yur seat. Please refrain frm cnversatin frm nw until yu leave and are utside the dr. Thank yu! The Staff appreciates yur cperatin. Teaching Assistants and Recitatin Sectins Name Chunxia Jiang Steven Raders Sectins 2, 3, 4 Time 0:00, 2:0 9:00, 2:0 THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #4 IN THE HALLWAY EAST OF ROOM 002 GILMAN AND ON THE CHEM 67 WEBSITE.
2 2. (4 pts) A gas expands in vlume frm 26.7 ml t 80.3 ml at cnstant temperature. Calculate the wrk dne (in jules) if the gas expands a) against a vacuum. b) against a cnstant pressure f.5 atm. 2. (6 pts) Cnsider the reactin H 2 (g) + Cl 2 (g) 2 HCl(g) H = 84.6 kj/ml Three mles f H 2 react with 3 mles f Cl 2 t frm HCl. Assume the reactin ges t cmpletin. a) Calculate the wrk dne (in jules) against a pressure f.0 atm at 25 C. b) What is E fr this reactin?
3 3 3. (8 pts) A quantity f ml f M HCl was mixed with f M NaOH in a cnstant-pressure calrimeter f negligible heat capacity. The initial temperature f the HCl and NaOH slutins was the same, C, and the final temperature f the mixed slutin was C. Calculate the heat change fr the neutralizatin reactin n a mlar basis. NaOH(aq) + HCl(aq) NaCl(aq) + H 2 O(l) Assume that the densities and specific heats f the slutins are the same as fr water (.00 g/ml and 4.84 j/g C, respectively). 4. (6 pts) Cnsider the fllwing energy levels f a hypthetical atm: E J E J E J E J What is the wavelength f the phtn needed t excite an electrn frm E t E 4?
4 4 5. (8 pts) Using the cre designatin methd write the cmplete grund state electrn cnfiguratins and als the rbital bx diagrams fr a) B Electrn cnfiguratin: Bx diagram: b) As Electrn cnfiguratin: Bx diagram: 6. (8 pts) Using the cre designatins and als bx rbital diagrams, write the electrn cnfiguratin fr the grund state f: a) Na + Electrn cnfiguratin: Bx diagram: b) S 2 Electrn cnfiguratin: Bx diagram:
5 7. (8 pts) Draw the Lewis structures f the fllwing. Use dashes instead f dts when pssible. a) NaF ( Electrnegativity > 2) 5 b) I 2 c) HCl gas d) H 2 S e) CO 2 f) XeF 6
6 6 8. ( pts) Give the xidatin number f each element in: a) H 2 SO 4 H, S, O b) NH 3 N, H c) NO 3 d) PH 4 + N, O P, H e) Al 2 O 3 Al, O 9. (8 pts) Write the Lewis structure fr the species belw and als write any Lewis structures that are resnance structures. a) NO 3 b) HNO 3 (H is bnded t an O) 0. (8 pts) Determine the frmal charges f all the atms in: (Shw yur wrk.) a) NO 2 b) NH 4 +
7 7. (5 pts) Sketch the shape f: a) any 2p rbital b) any d rbital 2. (7 pts) Calculate the enthalpy fr 2 H 2 + O 2 2 H 2 O given the fllwing bnd energies in kj/ml H H, 436; O=O, 499; O H, 460. (Shw yur wrk.) 3. (3 pts) Circle any species belw which have plar bnds and draw Lewis structures f these species. S 2 H 2 S NH 4 + N 2 O 2 2
8 8 Peridic Table f the Elements 03 Lr (260) 02 N (259) 0 Md (258) 00 Fm (257) 99 Es (252) 98 Cf (25) 97 Bk (247) 96 Cm (247) 95 Am (243) 94 Pu (244) 93 Np (237) 92 U Pa Th Lu Yb Tm Er H Dy Tb Gd Eu Sm 50 6 Pm (45) 60 Nd Pr 4 58 Ce 40 8A 8 7A 7 6A 6 5A 5 4A 4 3A 3 Lanthanides Actinides 09 Une (266) 08 Un (265) 07 Uns (262) 06 Unh (263) 05 Ha (262) 04 Rf (26) 89 Ac Ra Fr (223) 83 Bi Pb Tl Hg Au Pt Ir Os Re W Ta 8 72 Hf La Ba Cs 33 5 Sb Sn 9 49 In 5 48 Cd 2 47 Ag Pd Rh Ru 0 43 Tc (98) 42 M Nb Zr Y Sr Rb Rn (222) 85 At (20) 84 P (209) 52 Te I Xe 3 36 Kr Br Se As Ge Ga Zn Cu Ni C Fe Mn Cr V Ti Sc Ca K Ar Cl S P Si Al He Ne F O N C B 0.8 8B 2B 2 B B 7 6B 6 5B 5 4B 4 3B 3 2 Mg 24.3 Na Be Li A 2 A H.0
9 ln k = ln A E a RT K a K b = 0 4 G = G + RT ln Q F = 96,500 J/V ml PV = nrt Fr st rder reactins: Rate = k[a] ln [A] t [A] 0 = kt ln [A] t = kt + ln [A] 0 t /2 = k Fr 2 nd rder reactins: Rate = k[a] 2 = [A] t [A] t /2 = k[a] + kt h = Js c = ms J = kg m 2 s 2 E = hν λν = c 4.8 J/g C A = C s K w = ph = lg [H 3 O + ] P slvent = X slvent P slvent P = X slute P slvent N = kg m/s 2 Pascal = N/m 2 P A P T = X A E = q + w H = E + (PV) C = ms q = ms t E = H RT n u = λν h λ = mu k = Ae E a / RT K = [C]c [D] d [A] a [B] b K P = K c (RT) n ln k k 2 = E a R = E a R x = b ± T 2 T T T 2 T T 2 b 2 4ac 2a G = RT ln K G = nfe cell S surr = ΔH sys T G = H T S y = mx + b T = ΔH ΔS E = mc 2 E = H P V R = 8.34 J/ml K 0 9 nm = m 0 2 pm = m 0 2 cm = m λ = h mν E = 32 n 2 in kj x = b ± drt P b2 4ac 2a = mlar mass P V nt = P 2 V 2 nt 2 k = Ae E a / RT ln k = E a R T + ln A h p 4Π R = 8.34 J/K. mle r L atm/k mle [cnjugate base] ph = pk a + lg [acid] G rxn = Σn G f (prducts) Σm G f (reactants) ph = lg [H 3 O + ] r ph = lg [H + ] [H + ] [OH ] = K w = ph + poh = 4.00 S rxn H rxn = ΣnS (prducts) ΣmS (reactants) = [c H f (C) + d H f (D)] [a H f (A) + b H f (B)] E cell = V lg K n K a K b = K w R = L atm/k ml E cell = E cath E ande culmb = amp sec prtn mass = amu neutrn mass is amu ΔE = (Δm)c 2 speed f light = m/s.00 kg = amu J = kg m 2 /s 2 Faraday = 96,500 Culmbs 760 trr = atm Avgadr s Number = c = m/s H = ΔH f (prducts) ΔH f (reactants) H = BE(brken) BE(frmed) E = n 2 in J/atm H sln = H lattice + H hydr f the ins S gas = k H P gas T b = K b mlality T f = K f mlality = n slute V s ln RT = MRT = mlarity RT atm = kp a = 760 trr NaCl(s) H 2 O Na + (aq) + Cl (aq) energy + NaCl(s) Na + (g) + Cl (g) Fr zer rder reactins: = kt [A] t [A] 0 ln k 2 = ΔH rxn k R T 2 T
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