Engineering Materials Week

essay A

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An electrochemical cell is constructed such that on one side a pure electrode Is I contact with a solution containing ions at a concentration of M. The other cell half consists of pure electrode immersed In a solution of ions that has a concentration of M. At what temperature will the potential between the two electrodes be +0. 568 V? 17. 15 (a) Cite the major differences between activation and concentration popularization. Activation popularization Is the condition wherein a reaction rate Is controlled by one step In a series of steps that takes place at the slowest rate.

Concentration popularization occurs when a reaction rate Is Limited by diffusion In a solution. (b) under what conditions Is activation popularization rate controlling? When the reaction rate Is low and/or the concentration of active species In the solution Is high. (c) under what conditions Is concentration popularization rate controlling? When the reaction rate is high and/or the concentration of active species in the liquid solution is low. 17. 26 (a) What are inhibitors? Substances that when added to a corrosive environment in relatively low concentrations, decrease the environment’s . B) What possible mechanisms account for their effectiveness? Attachment of inhibitor molecules to the corroding surface so as to interfere with either the oxidation or reduction reaction; and the formation of a very thin and protective coating on the corroding surface. 17. 31 (a) Determine whether the oxidation kinetics obey a linear, parabolic, or logarithmic rate expression. From the first two equations 0. 238 and = 14. 2; while from the second and third equations K, = 0. 17 and = 44. 5. Thus, a parabolic rate expression is not obeyed by this reaction. 6. 16= 8. 59 = 1 2. 2 = And the three values may be computed which are 6. 16 x , 3. 44 x , and 1. 272 x . Since these values are all different, a linear rate law is not a possibility, and a logarithmic expression is obeyed. (b) Now compute W after a time of 5000 min. Is I contact with a solution containing ions at a concentration of M. The other cell half consists of a pure electrode immersed in a solution of ions that has a popularization. Activation popularization is the condition wherein a reaction rate is controlled by one step in a series of steps that takes place at the slowest rate.

Concentration popularization occurs when a reaction rate is limited by diffusion in a solution. (b) Under what conditions is activation popularization rate controlling? When the reaction rate is low and/or the concentration of active species in the liquid solution is high. (c) Under what conditions is concentration popularization rate.

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