Fall+2006+Final - Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 BME 221...

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Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Σ BME 221 “Biophysical Chemistry” Final Exam, Dec. 18, 2006 Name: _______________________________________ UM ID: ______________________ Avogadro’s number N A = 6.02 10 23 Elementary charge e = 1.6 10 -19 Coul Q1) Explain the mechanism of function of a cool-pack in thermodynamic terms. (10P) Q2) Imagine you have the task to produce ammonia (NH 3 ) from nitrogen gas and hydrogen gas. Q2A) Write down the reaction equation for this reaction (do not forget stoichiometric coefficients). (2P) Q2B) Given that the reaction enthalpy for this reaction has a positive value ( H > 0) and considering the enthalpic term only, would increasing the temperature in the reaction vessel shift the equilibrium constant for this reaction to a value i) less positive, ii) more positive, or iii) keep it constant (circle on of these three options)? (2P) Q2C) What else (apart from changing the reaction temperature) could you do to favor the formation of ammonia in your reaction vessel? (2P) Q2D) Explain your answer for Q2C (2P) 1 of 4
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Q2E) How would increasing the temperature in the reaction vessel influence the entropic term (the term that contains S) in the equation for the Gibbs free energy? Give your answer by choosing one of the following, the entire entropic term would be more positive, less positive, more negative, or less negative (2P) Q3) Why does the random coil conformation of proteins become the most likely conformation at elevated
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Fall+2006+Final - Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 BME 221...

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