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Unformatted text preview: BME HW#8 Nigel Chou 17.1) a) Oxidation is the process by which a chemical species (usually a metal) gains electrons according to the equation - + + ne n M M , whereas reduction is the process by which a chemical species loses electrons . An example is the reduction of Hydrogen, which occurs according to the equation (gas) H 2 H 2 2 +- + e . b) Anode: Oxidation Cathode: Reduction 17.5) Yes. The electrode with the smaller concentration (2 x 10-2 mol) is oxidized. mV 3 . 41 V 0413 . J/C 0413 . ) mol 5 . ( ) mol 02 . ( ln ) C/mol 96500 )( 2 ( ) K 298 )( K- J/mol 31 . 8 ( ) ( 5 . 02 . ln ) ( o 0.02 o 0.5 = = =- = -- = n RT V V V 17.8) which metal will corrode a) Aluminum b) No corrosion (both Iconel and Nickel have same reactivity in the galvanic series) c) Zinc d) Brass e) Low-Carbon steel 1 17.13) a) 1 2 1 2 1 s cm mol 9600 ) mol C 96500 )( ( ) cm s C ( ) ( unit time per area unit per atoms of loss of Rate----- = = = n i n i n i r 3 1 3 cm mol ) mol g ( ) cm g ( ) ( unit vol per atoms of No....
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- Spring '07