18.1 (a) Briefly explain the difference between oxidation and reduction electrochemical reactions. (b) Which reaction occurs at the anode and which at the cathode?
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- |%AE |1, Ii. 6- Given the electrochemical reaction shown, if the standard reduction potential of Ag+----> Ag is +0.80 V, and the standard reduction potential of Cu2+---- >Cu is +0.34V, what is E° for the following? Cu/Cu+2(aq)//Ag+ (aq)/Ag * +1.26 V +0.85 V +0.46 V -0.37 V 7- The oxidati mber of sulfur in thiosultate ion S203-2Q. Why is electrothermal atomization widely used in clinical applications? Q. What are the advantages and disadvantages of the standard addition method for the above applications?In MO theory, which has the highest bond order?
- What is degree of reaction? Give expressions of reaction rate equations by degree of reaction.Question 3: : Estimate the corrosion rate (g/cm².s), penetration rate (mm/yr), and Ecorr (V) for a zinc tank containing oxygen free solution (pH =0). Assume the anodic reaction is under activation control and cathodic reactions is under activation and concentration control with the limiting current density for hy- drogen reduction on Zn is 5×10-5 A/cm?. [Zn**] = 1M at 298 K. The atomic weight of zinc is 65.4 g/mol. Density of zinc is 7.13 g/cm³. io, Zn = 1×10-7 A/cm², ßa= 0.09 V/decade io, H= 1×10-10 A/cm?, Bc= -0.08 V/decade icorr = 1.2×10-4 A/cm2Question: 4 A sheet of copper is exposed to oxygen at 1000°C. After 100 h, 0.245 g of copper are lost per cm' of surface area; after 250 h, 0.385 g/ cm² are lost; and after 500 h, 0.560 g/ em are lost. i. Determine whether oxidation is parabolic, linear, or logarithmic ii. Calculate the time required for a 0.76-cm sheet of copper to be completely oxidized. The sheet of copper is oxidized from both sides.
- 5 During decommissioning work, in order to determine the number of radionuclides deposited in a section of iron pipe, you grind up a small section of the pipe into a fine powder to carry out a reaction at 400 0C. Preliminary analysis shows that the predominant iron species are FeO and Fe2O3 Is it safe to use an aluminum crucible for heating your sample? What about a graphite crucible? Provide a short but detailed explanation referencing Ellingham diagrams, calculating Gibbs Free Energy, as well as provide any relevant reactions.Approximately how many degrees wide is the transition range at the 0.1 carbon alloy?FROM THE BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD.