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Exam%203%20Spring%202007%20crib-aec - CRIB Kinetics 1...

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CRIB Kinetics 1. Consider the following rate equation: d [ A ] dt = k [ A ] 2 [ B ] 1/2 What is the order of the reaction with respect to A? a. 0 b. 0.5 c. 1 d. 2 e. 2.5 Answer: d. 2. What kinetics are being followed for the rate of apple gathering in the following situations? Situation 1 : You are picking apples from a single tree. As you pick, the number of available/reachable apples decreases, so the rate of apple picking decreases proportionately. Situation 2 : You are walking through an orchard, picking apples as you go, at a constant rate. Situation 1 Situation 2 a. 0 order 1 st order b. 3 rd order pseudo-1 st order c. pseudo-0 order 1 st order d. 1 st order pseudo-0 order e. 2 nd order 1 st order Answer: d. 3. For a first order reaction, the rate constant is k = 3.8 x 10 -8 s -1 . Calculate the half life of the reaction. a. 1.8 s b. 1.8 min c. 3.8 h d. 5,066 hours e. 7,310 hours Answer: d.
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CRIB 4. When formic acid (HCO 2 H) decomposes it follows first order kinetics: HCO 2 H (g) Æ CO 2 (g) + H 2 (g) The half-life of the reaction is 32 seconds. How many seconds are needed for formic acid, initially 0.98 M to decrease to 0.06125 M? a. 512 s b. 64 s c. 128 s d. 54 s e. 32 s Answer: c. First figure out how many half-lives need to have taken place in order for this change in concentration to occur. The definition for a half-life is that half of the original concentration is gone. We see that the concentration has dropped by a factor of 16. Therefore four half-life periods have passed. So the time it takes to reach 0.06125 M is 32 sec * 4 =128 sec. 5. Consider an enzyme reaction for which V max is 9.4 x 10 -3 M s -1 and the substrate concentration happens to be equal to the Michaelis constant at 6.6 x 10 -4 M. Calculate the rate of the reaction, V. a. 2.3 x 10 -3 M s -1 b. 3.9 x 10 -3 M s -1 c. 4.7 x 10 -3 M s -1 d. 9.4 x 10 -3 M s -1 e. Not sufficient information available.
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Exam%203%20Spring%202007%20crib-aec - CRIB Kinetics 1...

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