One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the following reaction:
Chlorine atoms can act as a catalyst for the destruction of ozone. The activation energy for the reaction
Cl(g) + O3(g) → ClO(g) + O2(g)
Is 2.1 kJ/mol. Which is the more effective catalyst for the destruction of ozone, Cl or NO? (See Exercise 75.)
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Chemistry: An Atoms First Approach
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- Hydrogen peroxide and the iodide ion react in acidic solution as follows: H2O2(aq)+3I(aq)+2H+(aq)I3(aq)+2H2O(l) The kinetics of this reaction were studied by following the decay of the concentration of H2O2 and constructing plots of ln[H2O2] versus time. All the plots were linear and all solutions had [H2O2]0 = 8.0 104 mol/L. The slopes of these straight lines depended on the initial concentrations of I and H+. The results follow: [I]0 (mol/L) [H+]0 (mol/L) Slope (min1) 0.1000 0.0400 0.120 0.3000 0.0400 0.360 0.4000 0.0400 0.480 0.0750 0.0200 0.0760 0.0750 0.0800 0.118 0.0750 0.1600 0.174 The rate law for this reaction has the form Rate=[H2O2]t=(k1+k2[H+])[I]m[H2O2]n a. Specify the order of this reaction with respect to [H2O2] and [I]. b. Calculate the values of the rate constants, k1 and k2. c. What reason could there be for the two-term dependence of the rate on [H+]?arrow_forwardThe frequency factor A is 6.31 108 L mol1 s1 and the activation energy is 10. kJ/mol for the gas-phase reaction NO(g)+O3(g)NO2(g)+O2(g) which is important in the chemistry of stratospheric ozone depletion. (a) Calculate the rate constant for this reaction at 370. K. (b) Assuming that this is an elementary reaction, calculate the rate of the reaction at 370. K if [NO] = 0.0010 M and [O3] = 0.00050 M.arrow_forwardAssuming that the mechanism for the hydrogenation of C2H4 given in Section 11-7 is correct, would you predict that the product of the reaction of C2H4. with D2 would be CH2DCH2D or CHD2CH3? How could the reaction of C2H4 with D2 be used to confirm the mechanism for the hydrogenation of C2H4 given in Section 11-7?arrow_forward
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