Question

Instructor Name: Student Name: EXP #4: PRE-LAB EXERCISE (there are questions on both sides) 1. Given the following data, determine the orders (m and n) with respect to the concentrations of A and B in the reaction A+ Bproducts Rate k[A]"[B* Time for reaction [BI [A] TAM 19 sec 0.020 M 0.020 M 19 sec 0.020 M 0.010 M 76 sec 0.010 M 0.020 M 76 sec 0.010 M 0.010 M Orders: n= m= What time would you predict if both concentrations of A and B were made to be 0.005 M? 2. If 35 mL. of a 0.0024 M solution of KIO) is added to 15 mL of water and 50 mL of 0.0026 M NaHSO, what is the new concentration of KIO, immediately after it is diluted by the other two solution components? Assume none of the KIO3 has disappeared due to the reaction. Instructor Name Student Name: 3. Draw an energy curve similar to that one page 3, and show how it would change if a catalyst were added to the reaction mixture. 4. Dr. Herbert Schmozawitz can ride his recumbent bicycle at amazing speeds. His friends at The Engineer's Club call him Herb the Missile. In June, he rode a ten mile time trial in a time of twenty-seven minutes and three seconds. In July, he upgraded his bike with an aerodynamic carbon fiber disc wheel and wore a swooped back racing helmet. These two updates yielded him a much faster time of twenty-five minutes and sixteen seconds! Afterwards, he celebrated by downing a nice cool glass of chocolate soy milk. Calculate the ratio of the rates of his travel (faster rate divided by slower rate).

Answer 1

Givem PYodu A +B TAT ta Yeaction Time Se e O-62 M q Sec O.olM 6 Sec O 02M 0 01M 3. 76 se c 0-OIM 0 0IM the a Methody T0 Obtain Yate diffeveut at Con centrations Yate Compare tha veaction 2- determine the Yeaction order A )B Yate 4 KCA] B k A B Divide these a Yate 1 Yate a de texaene the yeaction ordey s You cam A and B

deter mine n TO u se tue data o exferimevdt which aa 2 Sarne Yate 1 CAC Yate 2 [A 0 - 0L M Yate 1 Yate a Same time reaction, then and 2 have the Enp. the Yate 1 - Yate 2 that means Yate i O.01M Yate 0) Thi neans use the data dk determine m experiment to 2. ttue sarne witw ex P CAB A Yate1 Yate 3 Yate 1 0- 02M [AJ Yate 3 diereut eac tion time O have Enp. This shows exp3 is 1q sec f f exp 3= 76.Sec. exp slower tham exp (1 sec tham exp 3 (yated- uxYnte 3) by ×4-子6 Sec)、Then Nate is 4 kaste times

3) 0.02 M Tate 4 o-olM Yates 4xYate Yate (2) (2- m 2- Predict time Yeaction 2eYo ode, "fhan [ Lime does not ekfect the A S B Yeaction t Second order, then C A J change reaction tîne, AS A when TA is Coxpt) Yeaction tme is 76 Sec O oM the is changed fo o-oorM , then the yeaction Yate muyt DA)s s lower tham when time For LA Yeaition time in crease an 4 *espettoL o Dor M o61 M if CA o .005 M, Yeaction pime wil be 3 o 4 Sec Con centYation Com poun d volume O 00 24H 3 mL NaHso3 O O026M 5omL water 1me

watex dilute KIO3 when and Natt Sotue you Volume i s - Vwater t VNaH So VT K103 35m L SomL bu dilution, you Can when you prepare Solution O ne w following ormula Mcen Vcons the Here Concentyated Solution Con C - Slution diluted dil Concentyation Hhe Ne w Maii Mconc Vconc d-0024MX 3TmL Vdil oO mL Con centration. M . Jhe reaction Mixture To the catalyst is adde d with Yedu ces fhe catalyst tue occurs fa st i As Yeaction energy (Ea) required No Catalyst 8 tue reaction. activation Enery EaC Cat) -> ith Catalyst Reactant Reaction

(5) Data June lo miles 3 Se c 9 min July lomiles as min 16Se c. time to min: we June x Imin Qmin +3 se c = 6OSec a7 min + o-bsmin time O min July time Imin arminI6 Sec armin+ X 6as ec time NOw w e Calculate the Yate: Can June distante omiles rate - 0-3omile time min 2.Drmim July o miles at e D 396 mni lej min. a5.26mn oYates Novo Yatio Pastey Yate July rate slower rate June Yate O 396 1 o 370 Yatio hi travel is Yates