solutions - 1 Callister 10.2(a Rewrite the expression for...

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1. Callister 10.2 (a) Rewrite the expression for the total free energy change for nucleation (Equation 10.1) for the case of a cubic nucleus of edge length a ( instead of a sphere of radius r). Now differentiate this expression with respect to a (per Equation 10.2) and solve for both the critical cube edge length, a*, and also ! G*. (b) Is ! G* greater for a cube or a sphere? Why?
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2 . Callister 10.4 (a) For the solidification of nickel, calculate the critical radius ! r and the activation free energy ! " G if nucleation is homogeneous. Values for the latent heat of fusion and surface free energy are -2.53 9 10 ! J/ 3 m and 0.255 J/ 2 m , respectively. Use the supercooling value found in Table 10.1. (b) Now calculate the number of atoms found in a nucleus of critical size. Assume a lattice parameter of 0.360 nm for solid nickel at its melting temperature.
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4.Core 9.01 1. Suppose a thin film (50 nm thick) of nickel is deposited on the end of a very long copper bar. If this bar is heated to 0.8 of the melting temperature of Cu, draw
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This note was uploaded on 09/26/2010 for the course CHEMISTRY 123 taught by Professor John during the Winter '09 term at UCSB.

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solutions - 1 Callister 10.2(a Rewrite the expression for...

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