K The slowest step in a mechanism has this

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1 CM 6 Generl Chemisry II Nme SLUTINS Exm, Spring 009 Dr. Seel. (0 pins) Selec he nswer frm he clumn n he righ h bes mches ech descripin frm he clumn n he lef. Ech nswer cn be used, ms, nly nce. E G This usully cuses decrese in he re cnsn f recin This d is pled chieve liner grph if recin is zer-rder A. ln[x = ln[x - k B. clys A An elemenry recin invlving nly ne recn, X, wuld hve his inegred re lw C. vs. ime K The slwes sep in mechnism hs his D. psiive C J B F N This d is pled chieve liner grph if recin is secnd-rder This is n inegred re lw fr secnd-rder recin invlving X The ddiin f his will usully increse he re f recin This is he nme sscied wih he ms unfvrble rrngemen f ms in recin An exhermic recin hs his sign sscied wih is enhlpy chnge E. emperure decrese F. rnsiin se G. cncenrin vs. ime. lrge I. emperure increse L If he civin energy f recin is lrge, he re cnsn is likely be his size J. [X = k + [X 0 K. lrge E L. smll M. [X = [X - k N. negive

2 . (9 pins) Cmplee he ble f infrmin reling he differen cubic uni cells. Simple Cubic Bdy-Cenered Cubic Fce-Cenered Cubic Ams in he Cell 4 Crdinin Number 6 8 Express in erms f R = R These ringles migh help. bdy dig. fce dig.. ( pins) Circle he mlecule in his grup h will hve he highes biling pin. Cl N 4. ( pins) Circle he mlecule in his grup h will hve he highes biling pin. C N 5. ( pins) Circle he mlecule in his grup h will hve he highes biling pin. C C Ar C C 6. (4 pins) Use he infrmin prvided deermine he recin rder h is being described. The rders re ll whle numbers. 0 When he cncenrin f he recns is dubled, here is n chnge in he re f he recin The re cnsn f he recin hs unis f L ml s. When he cncenrin f recns is ripled, he re f he recin becmes 9 imes fser. 4 When he cncenrin f recns is cu in hlf, he re f he recin becmes 6 imes slwer.

3 7. (0 pins) Nme he srnges ype f inermleculr rcive frces h exis in he given merils. diple-diple C hydrgen bnding C dispersin frces F diple-diple P diple- induced diple S nd dispersin frces C 8 nd Cl dispersin frces SiCl 4 diple-diple C C diple-diple C Cl inic KCl 8. (8 pins) Sdium crysllizes in bdy-cenered cubic uni cell. If he lengh f n edge f he uni cell is 0.40 nm, wh is he mic rdius (in nm) f sdium m? bdydignl = 4R (4R) R = 4 = (0.40 nm) 4 = + = 0.86 nm = bdy dig. 9. (8 pins) Aluminum (mic mss 6.98 g/ml) crysllizes in fce-cenered cubic uni cell. In ddiin, luminum hs lice cnsn f m. Wh is he densiy f luminum? Vlume f uni cell = = ( m) = m 6.98 g ml ml ms 4 ms uni cell uni cell m m (00 cm) =.7 g cm

4 ps! I frg lbel he vpr pressure curves belw. The hree subsnces I ghered d fr were ehylene glycl (C C ), hexne (C 6 4 ), nd wer. Answer he quesins belw reling he digrm. 7 6 Vpr Pressure Curves A = Vpr Pressure (m) B = W C = EG Temperure ( C) 0. (6 pins) Idenify ech curve by wriing eiher EG fr ehylene glycl, fr hexne, r W fr wer in he bx nex he pprprie curve n he digrm. A = exne B = Wer C = Ehylene Glycl. ( pins) Wh is he pprxime biling pin f subsnce B when i is in clsed cniner wih hed-pressure f 4 m? Biling Pin is pprx. 40 C. ( pins) Wh is he pprxime vpr pressure f subsnce A 00 C? The vpr pressure is pprx.. m. (8 pins) Lbel he indiced cmpnens f he phse digrm belw. A B C D Slid Liquid Vpr-Liquid Equilibrium Triple Pin

5 4. (9 pins) The secnd-rder recin describing he decmpsiin f P hs re L cnsn k = 0.07 ml s. w lng will i ke fr.49-m smple f P be reduced 5% f is riginl vlue? P (g) P (g) + (g) 5% f.49 M = 0.75 M [P = k + = 0.07( ) = 0.07( ) = 6. s [P (9 pins) Deermine he hlf-life fr he recin in quesin 4, using he sme se f iniil cndiins. [P = k + = 0.07( ) = 0.07( ) = 0.8 s [P 6. (9 pins) The decmpsiin f S Cl, firs-rder prcess, hs hlf-life f 4880 s cerin emperure. Wh percenge f M smple f S Cl will remin fer llwing he recin prceed fr 4.00 hurs? Nw slve fr [ A [ A ln ln ln = k = = =.4 0 k 4880 s = 4.00 hr = s : 4 (.4 0 s )( s) [A ln.045 [A = k = = [A.045 = e = 0.9 [A Thus,.9% f he S Cl is lef fer 4.00 hurs. 4 s

6 Bnus: Drw resnble recin crdine digrms h crrespnd he w recin mechnisms prpsed belw. The mechnism n he lef is fr he unclyzed recin while he ne n he righ invlves clys. The recins re bh exhermic. Unclyzed Recin N + N N + N N + C N + C (slw) (fs) Clyzed Recin N + X N X + (fs) C + C (slw) N X + N + X (fs) UNCATALYZED CATALYZED Energy RecinPrgress elpful Infrmin fr he Exm [A = [A k ln[a [A = ln k = + k [A [A E RT k = Ae

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