Consider the cementation of copper on iron according to the displacement reaction which can be used to recover copper from dilute liquors cu2+ fe- cu +fe2+. draw the current potential curves for the cathodic and anodic half cell reactions explain what you understand by the mixed potential measured using an iron rod immersed in a copper sulfate solution during cementation and how it relates to the rate of the cementation reactionn information from a rotating disc experiment for copper cementation is provided below calculate the diffusivity of cu ions and comment on the rate-controlling step. (see lecture slides) (b) (c) j = | (012 )c-kc (levich equation) 0.62d23 1/6 d-diffusivity (diffusion coefficient) ω-rotation rate-1000 rpm (revolutions per minute; i rpm-2 π /60 s-1) v-kinematic viscosity -9 x 107m2 s1 k-apparent mass transfer coefficient = 9.9 x 10-3 cm s d= disc diameter, (disc area 0.2 cm2) area of a disk = (nd-)/4

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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