112_Fa11_Ex1-B

112_Fa11_Ex1-B - C h e m is t r y 1 1 2 N am e E xa m I F o...

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Chemistry 112 Name _______________________ Exam I Form B Section _______________________ September 13, 2011 eMail _______________________ IMPORTANT : On the scantron (answer sheet), you MUST clearly fill your name , your student number , section number , and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 25 questions on this exam. Check that you have done all of the problems and filled in the first 25 bubbles on the scantron. The maximum score on this exam is 25 points. Your score will be reported in percent (max 100%). Exam policy Calculators with text-programmable memory are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (on the Exam Schedule page). You must turn in your cover sheet with your scantron answer form. Hints As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing.
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CHEMISTRY 112 EXAM 1 SEPTEMBER 13, 2011 FORM B ------------------------------------------------------------------------------------------------------------ 1. Consider the following mechanism: Step 1: 2 NO (g) N 2 O 2 (g) Step 2: N 2 O 2 (g) + H 2 (g) N 2 O(g) + H 2 O(g) Step 3: N 2 O(g) + H 2 (g) N 2 (g) + H 2 O(g) Identify the intermediate(s). A. N 2 O 2 (g) B. N 2 O(g) C. N 2 O 2 (g)and N 2 O(g) D. H 2 O(g), N 2 O 2 (g) and N 2 O(g) E. N 2 (g) and H 2 O(g) ------------------------------------------------------------------------------------------------------------ 2. For a first order decomposition reaction, 50% of the reactant decomposes in 10.2 seconds. How long does it take for 75% of the reactant to decompose? A. 4.2 s B. 5.1 s C. 15.3 s D. 17.9 s E. 20.4 s ------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------ 3 Based on the following reaction profile, which of the following is correct? 1. There are three intermediates. 2. There are two transition states. 3. The first step of the reaction is the rate-limiting step. 4. The final step of the reaction is faster than the first step. A. 1 only B. 1 and 2 only C. 3 only D. 1, 2 and 4 only E. 4 only ------------------------------------------------------------------------------------------------------------ 4. For the first order reaction of A to produce B, the rate constant is 2.5 × 10 ʵ 3 s ʵ 1 . How long does it take for [A] to decrease to 1/3 of its initial value? A. 7.5
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112_Fa11_Ex1-B - C h e m is t r y 1 1 2 N am e E xa m I F o...

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