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Quiz 14 and 15 potential problems ChE 350 F09

# Quiz 14 and 15 potential problems ChE 350 F09 - [Consider...

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Sample questions for ChE 350 Fall 2009 Quiz 14/15 Name:________________________ 1 1. (a) Compute the voltage at 25 o C of an electrochemical cell consisting of pure lead immersed in a 0.05 M solution of Pb 2+ ions, and pure tin in a 0.25 M solution of Sn 2+ ions. [Look up the redox potentials in Callister—I’ll provide them on the exam.] (b) Write the spontaneous electrochemical reaction. 2. If aluminum and cast iron are coupled in seawater, will one of them corrode, and if so, which one will corrode? [Look up the redox potentials in Callister—I’ll provide them on the exam.] 2. A steel wire is stretched with a stress of 70 MPa at 20 o C. If the length is held constant, to what temperature must the wire be heated to reduce the stress to 17 MPa?
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Unformatted text preview: [Consider the elastic modulus of steel to be temperature independent and equal to 207 GPa; the linear thermal expansion coefficient is C 10 12 o 6 − × .] 3. (a) Calculate the heat flux through a sheet of brass ( k =115 W/m K) 7.5 mm thick if the temperature at the two faces are 150 and 50 o C; assume steady-state heat flow. (b) What is the heat loss per hour if soda-lime glass (( k =1.7 W/m K) instead of brass is used? 4. The heat capacity for an ideal crystalline solid is 3 R , where R is the gas constant. The heat capacity for Al is 900 J/kg K. What percentage deviation is this value from the ideal value of 3 R ?...
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