CHEMISTRY 204 Spring 2006HOUR EXAM IIIDr. Christine Yerkes NAME _______________________________ April 26, 2006 SIGNATURE _________________________ QUIZ TA _____________________________ Test Form AA. DO NOT open the exam until you are instructed to do so.B. The exam has 11 pages. After you are instructed to begin the exam, please check to see that you have all 11 pages.C. You should also have a list of helpful information and equations and a periodic table. D. The exam contains 45 questions. The point value of each question appears next to the question number.E. Academic dishonesty. If cheating is observed, any students involved will receivea zero on the exam.INSTRUCTIONS FOR THE ANSWER SHEET.1. Use a soft lead pencil and make dark marks. Do NOT use a pen. Erase all changescompletely.2. Print your Name in the appropriate designated spaces, then blacken in the letter boxes below each printed letter, last name first, then your first name initial.3. Under Network ID print your University Network ID starting from box #1, then blacken in the corresponding letters, numbers and/or dashes.4. Sign your name (do not print) on the line provided. Your signature indicates that this is your work. Print your name underneath it.5. Put your section number under course code:AQA = 00001 AQB = 00002 AQC = 00003 AQD = 00004AQF = 00005 AQG = 00006 AQI = 00007 AQJ = 000086. Mark only one answer for each question.Useful Information:order Rate Law Integrated form plot slope k (units) half-life0 rate = k [A]t - [A]0 = -kt [A] vs. t -k mol/L s2k]A[t02/11 rate = k[A] ln[A]t - ln[A]0 = -kt ln[A] vs. t -k 1/sk2lnt2/1 2 rate = k[A]21/[A]t - 1/[A]0 = kt 1/[A] vs. t k L/mol s02/1k[A]1t Arrhenius equation:k = RTEapze/R = 8.314 J/K molk = RTEaAe/K = °C + 273ln k = ln A - Ea/RT ln (k2/k1) = (Ea/R)(1/T1 - 1/T2)CHEMISTRY 204 Spring 2006HOUR EXAM III page 1 One component of smog that is especially irritating to eyes is formaldehyde, CH2O, which is formed in the reaction between ozone, O3, and ethene, C2H4.C2H4 (g) + O3 (g) → 2CH2O (g) + ½ O2 (g)The initial rate was studied as -d[C2H4]/dt, and the results at 298 K are shown below. Usethis information to answer the next three (3) questions.expt. [O3] (M) [C2H4] (M) initial rate (Ms-1) 1 0.5 x 10-71.0 x 10-81.0 x 10-12 2 1.5 x 10-71.0 x 10-83.0 x 10-12 3 1.0 x 10-72.0 x 10-84.0 x 10-121. (2) The rate law for this reaction is:a) rate = k[C2H4][O3] b) rate = k[C2H4]2c) rate = k[O3]d) rate = k[C2H4]2[O3] e) rate = k[C2H4]2. (2) In experiment 3, what is the rate of appearance of oxygen, at 298 K?a) 1.0 x 10-12 Ms-1b) 2.0 x 10-12 Ms-1c) 4.0 x 10-12 Ms-1d) 8.0 x 10-12 Ms-1e) none of these3. (3) If the initial concentrations of both C2H4 and O3 are 1.0 x 10-7 M, what is the initial rate of the reaction, as measured by -d[C2H4]/dt, at 298 K (in Ms-1)?a) 1 x 10-12b) 2 x 10-12c) 1 x 10-11d) 2 x 10-11e) 1 x 10-10A certain reaction is 40% complete after 50 minutes and is 57% complete after 100 minutes. Assume an initial concentration of 1.0 M. Use this information to answer the next three (3) questions.4. (3) The rate law for this reaction is:a) zero order b) first order c) second order d) third ordere) none of these5. (2) The half time for the process is:CHEMISTRY 204 Spring 2006HOUR EXAM III page 2 a) 60.0 min b) 68.0 min c) 75.0 min d) 86.0 mine) none of these6. (2) The rate constant for the reaction (with no units) is:a) 1.00 x 10-2b) 1.33 x 10-2c) 1.85 x 10-2d) 8.25 x 10-3e) none of theseSelect the appropriate graph for the following choices for a reaction of the typeA  Ba) d)c)b)e) none of these7. (2) The ln[A] vs t for a reaction which is second order in A8. (2) k vs T (K) for a zero order reaction9. (2) [B] vs t for a first order reaction10.(2) [B] vs t for a zero order reaction11.(2) ln k vs 1/T 12.(2) 1/[A] vs t for a second order reaction13.(2) How many different dibromination products are formed in the reaction between cyclobutane and bromine in the presence of uv light? (omit optical isomers).C4H8 + Br2  C4H6Br2 + 2 HBrCHEMISTRY 204 Spring 2006HOUR EXAM III page 3 a) 2 b) 3 c) 4 d) 5 e) 614. (2)Saran wrap, an addition polymer, has the structure shown below. ClCl ClClClClClClnWhat is the correct, IUPAC, name for the monomer used in its synthesis?a) trans-1,2-dichloroetheneb) cis-1,2-dichlorothenec) cis-1,1-dichloroethaned) trans-1,1-dichloroethanee) none of the names (a-d) are the correct IUPAC name for the monomerUse the information shown below to answer the next seven (7) questions.At 227oC, 1,3-butadiene gas converts to cyclobutene gas.The values for -d[1,3-butadiene]/dt are shown below. time (s) [1,3-butadiene] (M)600 0.01481200 0.01311800 0.01182400 0.01073000 0.009815. (3) Calculate the initial concentration of 1,3-butadiene and the rate constant, k, for this process.k [1,3-butadiene]0a) 1.33 x 10-3 M-1 s-10.0165 Mb) 1.33 x 10-3 s-10.0168 Mc) 1.43 x 10-2 M-1s-10.0170 MCHEMISTRY 204 Spring 2006HOUR EXAM III page 4 d) 1.43 x 10-2 s-10.0165 Me) none of these (a-d)16. (2) How long will it take for the concentration of 1,3-butadiene to go to one-half of its original concentration?a) 1.14 hr b) 1.48 hr c) 2.28 hr d) 2.96 hr e) none of these (a-d)17. (2) If the activation energy of the forward reaction at 227 oC is 52 kJ and the activation energy of the reverse reaction is 126 kJ, what is the enthalpy change forthis one-step reaction?a) 74 kJ b) -74 kJ c) 52 kJ d) -52 kJ e) -183 kJ18. (3) How will the rate constant of the forward reaction change when the reaction is run at room temperature, 25 oC, instead of at 227 oC?a) rate