Search
Info
Warning
Danger

Study Resources (Chemistry)

35)The unimolecular decomposition of urea in aqueous solution is measured at two different temperatures and the following data are observed: Trial Number Temperature (°C) k (s–1) 1 60.0 1.2 ? 10–7 2 71.5 4.40 ? 10–7 a.Determine the Arrhenius parameters for this reaction. b.Using these parameters, determine ?H‡ and ?S‡ as described by the Eyring equation. .
0 Views
View Answer
34)Catalase is an enzyme that promotes the conversion of hydrogen peroxide (H2O2) into water and oxygen. The diffusion constant and radius for catalase are 6.0 ? 10–7 cm2 s–1 and 51.2 Å, respectively. For hydrogen peroxide the corresponding values are 1.5 ? 10–5 cm2 s–1 and r ? 2.0 Å..
0 Views
View Answer
36)The gas-phase decomposition of ethyl bromide is a first-order reaction, occurring with a rate constant that demonstrates the following dependence on temperature: Trial Number Temperature (K) k (s–1) 1 800 0.036 2 900 1.410 a.Determine the Arrhenius parameters for this reaction. b.Using these parameters, determine ?H‡ and ?S‡ as described by the Eyring equation. .
0 Views
View Answer
17)Given the following kinetic scheme and associated rate constants, determine the concentration profiles of all species using Euler’s method. Assume that the reaction is initiated with only the reactant A present at an initial concentration of 1 M. To perform this calculation, you may want to use a spreadsheet program.
0 Views
View Answer
9) What is meant by the rate-determining step in a sequential reaction? 10) What is the steady-state approximation, and when is this approximation employed? 11)In a parallel reaction in which two products can be formed from the same reactant, what determines the extent to which one product will be formed over another? .
0 Views
View Answer
10)Consider the schematic reaction a.If the reaction is one-half order with respect to [A], what is the integrated rate law expression for this reaction? b.What plot would you construct to determine the rate constant k for the reaction? c.What would be the half-life for this reaction? Will it depend on initial concentration.
0 Views
View Answer
22)Bacteriorhodopsin is a protein found in Halobacterium halobium that converts light energy into a transmembrane proton gradient that is used for ATP synthesis. After light is absorbed by the protein, the following initial reaction sequence occurs: a.At what time will the maximum concentration of the intermediate J occur? b.Construct plots of the.
0 Views
View Answer
26)A standard “rule of thumb” for thermally activated reactions is that the reaction rate doubles for every 10 K increase in temperature. Is this statement true independent of the activation energy (assuming that the activation energy is positive and independent of temperature)? 27)Calculate the ratio of rate constants for two thermal.
0 Views
View Answer
3)As discussed in the text, the total system pressure can be used to monitor the progress of a chemical reaction. Consider the following reaction: SO2Cl2(g) SO2(g) + Cl2(g). The reaction is initiated, and the following data are obtained: Time (h) 0 3 6 9 12 15 PTotal (kPa) 11.07 14.79 17.26 18.90 19.99 20.71 a.Is the reaction first or second order with respect to.
0 Views
View Answer
39)Chlorine monoxide (ClO) demonstrates three bimolecular self-reactions: The following table provides the Arrhenius parameters for this reaction: A (M–1 s–1) Ea (kJ/mol) Rxn1 6.08 ? 108 13.2 Rxn2 1.79 ? 1010 20.4 Rxn3 2.11 ? 108 11.4 a.For which reaction is ?H‡ greatest and by how much relative to the next closest reaction? b.For which reaction is ?S‡ the smallest and by how much.
0 Views
View Answer
37)Hydrogen abstraction from hydrocarbons by atomic chlorine is a mechanism for Cl loss in the atmosphere. Consider the reaction of Cl with ethane: C2H6(g) + Cl(g) C2H5(g) + HCl This reaction was studied in the laboratory, and the following data were obtained: T (K) 10–10 k (M–1 s–1) 270 3.43 370 3.77 470 3.99 570 4.13 670 4.23 a.Determine the Arrhenius parameters for this reaction. b.At.
0 Views
View Answer
8)The disaccharide lactose can be decomposed into its constituent sugars galactose and glucose. This decomposition can be accomplished through acid-based hydrolysis, or by the enzyme lactase. Lactose intolerance in humans is due to the lack of lactase production by cells in the small intestine. However, the stomach is an acidic.
0 Views
View Answer
8)How is the standard enzyme kinetic scheme modified to incorporate competitive inhibition? What plot is used to establish competitive inhibition and to determine the kinetic parameters associated with inhibition? 9)How can one tell the difference between competitive and noncompetitive enzyme inhibition? .
0 Views
View Answer
4)Consider the following reaction involving bromophenol blue (BPB) and OH–: BPB(aq) + OH–(aq) BPBOH–(aq). The concentration of BPB can be monitored by following the absorption of this species and using the Beer–Lambert law. In this law, absorption, A, and concentration are linearly related. a.Express the reaction rate in terms of.
0 Views
View Answer
32)In the following chapter, enzyme catalysis reactions will be extensively reviewed. The first step in these reactions involves the binding of a reactant molecule (referred to as a substrate) to a binding site on the enzyme. If this binding is extremely efficient (that is, equilibrium strongly favors the enzyme–substrate complex.
0 Views
View Answer
2)Consider the first-order decomposition of cyclobutane at 438°C at constant volume: a.Express the rate of the reaction in terms of the change in total pressure as a function of time. b.The rate constant for the reaction is 2.48 ? 10–4 s–1. What is the half-life? c.After initiation of the reaction, how long will.
0 Views
View Answer