Chem_208_S_2007_Final_Review_Quest_Sunday

Chem_208_S_2007_Final_Review_Quest_Sunday - Sylvester and...

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Sylvester and Opalka • Chem 208 Final Review Session • Cornell University • Spring 2007 Question 1: Enzymes are biological catalysts that lower the activation energy in the forward and reverse direction. The rate law of enzymatic reactions can typically be approximated by the Michaelis-Menten equation dP [] dt = k 2 E [ ] T S [ ] K M + S ; where E T = E + ES [E] T is the total enzyme concentration, [ES] is the concentration of enzyme bound to the substrate, and [E] is the concentration of free enzyme. Given the mechanism below, derive the M&M rate expression and K M in terms of the mechanistic rate constants E + S ES ES E + P k 1 k -1 k 2 Question 2: If a 1.250 kg brick of gold is placed in a conventional oven at 235 o C and is subsequently dropped into a dewer containing 0.500 L of liquid nitrogen (density of 0.808 g/mL, heat capacity of 2.042 J/g K) at 65.0 K, what is the final temperature of the nitrogen? Hint: consider the state of matter of the nitrogen. (Assume that no heat is lost to the surroundings). The boiling point of liquid nitrogen is 77.36 K. The enthalpy of vaporization of nitrogen is 5.57 kJ/mol.
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This note was uploaded on 05/18/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Chem_208_S_2007_Final_Review_Quest_Sunday - Sylvester and...

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