General Chemistry: Principles and Modern Applications (11th Edition)
General Chemistry: Principles and Modern Applications (11th Edition)
11th Edition
ISBN: 9780132931281
Author: Ralph H. Petrucci, F. Geoffrey Herring, Jeffry D. Madura, Carey Bissonnette
Publisher: PEARSON
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Chapter 20, Problem 97FP

The object is to study the kinetics of the reaction between perioxodisulfate and iodide ions.

  1. S 2 O 8 2 ( aq ) + 3 I - ( aq ) 2 SO 4 2- ( aq ) + 3 I ( aq )
    The I 3 formed in reaction (a) is actually a complex of iodine, I 2 , and iodide ion, I Thiosulfateion, S 2 O 3 2- ?, also present in the reaction mixture reacts with l just as fast as it is formed
  2. 2S 2 O 3 2- ( aq ) + I 3 - ( aq ) 3 I - ( aq )
    When all of the thiosulfate ion present initially has been consumed by reaction (b), a third reaction occurs between l (aq) and starch, which is also present in the reaction mixture
  3. I 3 - ( aq ) + starch blue complex The rate of reaction (a) is inversely related to the time required for the blue color of the starch-iodine complex to appear That is, the faster reaction (a) proceeds, the more quickly the thiosulfate ion is consumed in reaction (b), and the sooner the blue color appears in reaction (C). One of the photographs shows the initial colorless solution and an electronic timer set at t = 0; the other photograph shows the very first appearance of the blue complex (after 49 89 5). Tables I and II list some actual student data obtained in this study.

Chapter 20, Problem 97FP, The object is to study the kinetics of the reaction between perioxodisulfate and iodide ions. , example  1
Table I Reaction conditions at 24 ° C L 25.0 mL of ( NH 4 ) S 2 O 4 ( aq ) listed, 25.0 mL of the KI(aq) listed, 10.0mL of 0.010M Na 2 S 2 O 2 (a), and 5.0 mL starch solution are mixed. The time is time is that of the first appearance of the starch-iodine complex.

Chapter 20, Problem 97FP, The object is to study the kinetics of the reaction between perioxodisulfate and iodide ions. , example  2
Table II Reaction conditions: those listed in Table I for Experiment 4, but at the temperature listed.

Chapter 20, Problem 97FP, The object is to study the kinetics of the reaction between perioxodisulfate and iodide ions. , example  3
a. Use the data in Table I to establish the order of reaction (a) with respect to S 2 O 2 2 and to I - . What is the overall reaction order? [Hint: How are the times required for the blue complex to appear related to the actual rates of reaction?]
b. Calculate the initial rate of reaction in Experiment 1, expressed in M s"1. [Hint: You must take into account the dilution that occurs when the various solutions are mixed, as well as the reaction stoichiometry indicated by equations (a], (b); and (c).]
c. Calculate the value of the rate constant k based on experiments 1 and 2 d Calculate the rate constant, k, for the four different temperatures in Table II
e. Determine the activation energy, Ea; of the peroxodisulfate-iodide ion reaction.
f. The following mechanism has been proposed for reaction (a). The first step is slow, and the others are fast.
   I + S 2 O 8 3- IS 2 O 8 3 IS 2 O 8 3- 2SO 4 2- +I - I + + I - I 2 I 2 + I - I 3

Show that this meachanism is consistent with both the stoichimetry and the rate law of reaction (a). Explain why it is reasonable to expect the first step in the meachanism than the others.

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Chapter 20 Solutions

General Chemistry: Principles and Modern Applications (11th Edition)

Ch. 20 - The initial rate of the reaction A+BC+D is...Ch. 20 - For the reaction A+BC+D , the following initial...Ch. 20 - Prob. 13ECh. 20 - The following data are obtained for the initial...Ch. 20 - One of the following statements is true and the...Ch. 20 - One of the following statements true and the other...Ch. 20 - The first-order reaction A products has t1/2=180...Ch. 20 - The reaction A products is first order in A....Ch. 20 - The reaction A products is first order A. a. If...Ch. 20 - In the first-order reaction A products, [A] =...Ch. 20 - In the first-order reaction A products, it found...Ch. 20 - The half-life of me radioactive isotope...Ch. 20 - Acetoacetic acid, CH2COOH2COOH , a reagent in...Ch. 20 - The following first-order reaction occurs in...Ch. 20 - For the reaction A- products, the following data...Ch. 20 - The decomposition of dimethyl ether at 504C is (...Ch. 20 - [Hint: There are several of arrivivg at answer for...Ch. 20 - [Hint: There are several of arrivivg at answer for...Ch. 20 - Prob. 29ECh. 20 - Prob. 30ECh. 20 - Prob. 31ECh. 20 - Prob. 32ECh. 20 - [Hint: There are several of arrivivg at answer for...Ch. 20 - [Hint: There are several ways of arrivivig at...Ch. 20 - Prob. 35ECh. 20 - Prob. 36ECh. 20 - For the reaction A products, the following data...Ch. 20 - Prob. 38ECh. 20 - For the reaction A products, the data tabulated...Ch. 20 - For the reaction A2B+C , the following data are...Ch. 20 - In three different experiments, the following...Ch. 20 - Ammonia decomposes on the surface of a hot...Ch. 20 - Prob. 43ECh. 20 - Consider three hypothetical reactions A — products...Ch. 20 - Prob. 45ECh. 20 - If even tiny sped is introduced into a mixture of...Ch. 20 - For me reversible reaction A+BC+D , the enthalpy...Ch. 20 - Prob. 48ECh. 20 - By inspection of the reaction profile for the...Ch. 20 - By inspection of the reaction profile for the...Ch. 20 - The rate constant for the reaction...Ch. 20 - At what temperature will the rate constant for the...Ch. 20 - Prob. 53ECh. 20 - The reaction C2H5+OHC2H5OH+I was studied in an...Ch. 20 - The first-order reaction A products has a...Ch. 20 - For the first-order reaction N2O4(g)2NO2+12O2g...Ch. 20 - Prob. 57ECh. 20 - Concerning the rule of thumb stated r Exercise 57,...Ch. 20 - The following statements about catalysis are not...Ch. 20 - Prob. 60ECh. 20 - What are the similarities and differences between...Ch. 20 - Certain gas-phase reactions on a heterogeneous...Ch. 20 - The graph show s the effect of enzyme...Ch. 20 - The graph shows the effect of temperature on...Ch. 20 - Prob. 65ECh. 20 - Prob. 66ECh. 20 - The reaction 2NO+2H2N2+2H2O is second order m [NO]...Ch. 20 - The mechanism proposed for me reaction of H2(g)...Ch. 20 - The reaction 2NO+Cl22NOCl has rate law: rate of...Ch. 20 - A simplified rate law 1o the reaction 2O2(g)3O2(g)...Ch. 20 - Prob. 71ECh. 20 - One proposed meachanism for the condensation of...Ch. 20 - Suppose that the reaction r Example 20-8 is first...Ch. 20 - [A]t as a function of time for the reaction A —...Ch. 20 - Exactly 300 s after decomposition of H2O2(aq)...Ch. 20 - Use the method of Exercise 75 to determine the...Ch. 20 - Prob. 77IAECh. 20 - Prob. 78IAECh. 20 - Hydroxide ion is involved in the mechanism of the...Ch. 20 - The half-life for the first-order decomposition of...Ch. 20 - The decomposition of ethylene oxide at 690 K is...Ch. 20 - Prob. 82IAECh. 20 - The following data are for the reaction 2 A + B ...Ch. 20 - Prob. 84IAECh. 20 - Prob. 85IAECh. 20 - Prob. 86IAECh. 20 - The following three-step mechanism has been...Ch. 20 - Prob. 88IAECh. 20 - Prob. 89IAECh. 20 - Prob. 90IAECh. 20 - Prob. 91IAECh. 20 - Prob. 92IAECh. 20 - Prob. 93IAECh. 20 - You want to test the following proposed mechanism...Ch. 20 - Prob. 95IAECh. 20 - Benzenediazonium chloride decomposes by a...Ch. 20 - The object is to study the kinetics of the...Ch. 20 - Prob. 98SAECh. 20 - Prob. 99SAECh. 20 - Explain the important distinctions between each...Ch. 20 - Prob. 101SAECh. 20 - A first-order reaction A — products, has a...Ch. 20 - Prob. 103SAECh. 20 - Prob. 104SAECh. 20 - The rate of a chemical reaction generally...Ch. 20 - For the reaction A+B2C, which proceeds by a...Ch. 20 - Prob. 107SAECh. 20 - Prob. 108SAECh. 20 - Prob. 109SAECh. 20 - For me reaction A products the following data are...Ch. 20 - For the reaction A+2BC+D , the rate law is rate...Ch. 20 - Prob. 112SAECh. 20 - If the plot of the reactant concentration versus...Ch. 20 - Prob. 114SAECh. 20 - Prob. 115SAE
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Kinetics: Initial Rates and Integrated Rate Laws; Author: Professor Dave Explains;https://www.youtube.com/watch?v=wYqQCojggyM;License: Standard YouTube License, CC-BY