Chapter 16: Q16.18P (page 729)
Reaction rate is expressed in terms of changes in the concentration of reactants and products. Write a balanced equation for
Short Answer
The balanced equation is as follows:
Chapter 16: Q16.18P (page 729)
Reaction rate is expressed in terms of changes in the concentration of reactants and products. Write a balanced equation for
The balanced equation is as follows:
All the tools & learning materials you need for study success - in one app.
Get started for freeThe rate constant of a reaction is at and at . What is the activation energy of the reaction?
Even when a mechanism is consistent with the rate law, later work may show it to be incorrect. For example, the reaction between hydrogen and iodine has this rate law: . The long-accepted mechanism had a single bimolecular step; that is, the overall reaction was thought to be elementary:
In the 1960s, however, spectroscopic evidence showed the presence of free I atoms during the reaction. Kineticists have since proposed a three-step mechanism:
Show that this mechanism is consistent with the rate law.
For the reaction , [C] vs. time is plotted:
How do you determine each of the following?
(a) The average rate over the entire experiment
(b) The reaction rate at time x
(c) The initial reaction rate
(d) Would the values in parts (a), (b) and (c) be different if you plotted [D] vs. time? Explain.
Chlorine is commonly used to disinfect drinking water, and the inactivation of pathogens by chlorine follows first-order kinetics. The following data show E. coli inactivation:
Contact time (min) | Percent (%) inactivation |
0.00 | 0.0 |
0.50 | 68.3 |
1.00 | 90.0 |
1.50 | 96.8 |
2.00 | 99.0 |
2.50 | 99.7 |
3.00 | 99.9 |
(a) Determine the first-order inactivation constant, k. [Hint: % inactivation
(b) How much contact time is required for 95% inactivation?
What is the central idea of collision theory? How does this idea explain the effect of concentration on reaction rate?
What do you think about this solution?
We value your feedback to improve our textbook solutions.