Qu 2 Calcium oxide (CaO) a white, caustic, alkaline solid that reacts vigorously with water to produce calcium hydroxide, releasing heat in the process. It is used in various industrial applications, including cement production and water treatment. The ionic radii of the ions are: TCa2+= 0.100 nm and roz-= 0.140 nm.   On the basis of this information answer the following questions:Number 1 through 4 I need to show all work step by step problems

Nickel experiences corrosion in an acid solution according to the reaction Ni + 2H† → Ni²+ + H, (a) The rates of both oxidation and reduction half-reactions are controlled by activation polarization. Compute the rate of oxidation of Ni (in mol/cm2-s) given the following activation polarization data: For Nickel For Hydrogen V(H/H,) = 0 V i, = 6 × 10-7 A/cm² B = -0.10 V(NINP") = -0.25 V io = 10¬8 A/cm² B = +0.12 (b) Compute the value of the corrosion potential.

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Answer the folowing with True or False. Density of a foam material depends on the wall thickness and size of its foam cells.   (     ) BCC structure is more densely packed than the FCC structure. (    ) The anion – cation size ratio has an important influence in determining the crystal structure of ionic solids. (     ) CFRP and GFRP are examples of hybrid materials. ( ) The density of a material is determined exclusively by its atomic weight. ( ) Body diagonal in BCC structure has Miller indices of [111]. ( ) The relationship s = Ee is known the Ohms law. (     ) A closed packed triangular plane in FCC crystal has Miller indices of (111). ( )

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A number of elements along with their crystal structures and atomic radii are listed in the following table. Which pairs might be expected to have complete solid solubility in each other? Crystal Atomic Crystal Structure Atomic Structure radius (nm) radius (nm) Silver Palladium FCC 0.144 Lead FCC 0.175 FCC 0.137 0.137 Tungsten Rhodium ВСС Copper Gold FCC 0.128 FCC 0.134 Platinum Tantalum FCC 0.144 FCC 0.138 Nickel FCC 0.125 ВСС 0.143 Aluminum Sodium FCC 0.143 Potassium ВСС 0.231 ВСС 0.185 Molybdenum ВСС 0.136

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Copper is a typical face-centered-cubic metal. In its pure state, it has extremely high electrical conductivity. Oxygen in copper causes a major reduction of conductivity. To investigate this issue further, I want to you to tell me whether oxygen atoms substitute for copper atoms, or if they enter interstitial sites.

Problem 3 An FCC iron-carbon alloy initially containing 0.35 wt% C is exposed to an oxygen-rich and virtually carbon- free atmosphere at 1400 K (1127 °C). Under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0 wt% C. (This process of carbon depletion is termed decarburization.) At what position will the carbon concentration be 0.15 wt% after a 10-h treatment? The value of D at 1400 K is 6.9 x 10¹¹ m²/s.

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/cm2