178Exam1BKeyF06

178Exam1BKeyF06 - STACEY STOFFREGEN FALL 2006 CHEM 178 HOUR...

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STACEY STOFFREGEN CHEM 178 NAME FALL 2006 HOUR EXAM I (Yellow) RECIT. INSTR. RECIT. SECT. THIS EXAM CONSISTS OF 13 QUESTIONS ON 7 PAGES Teaching Assistants and Recitation Sections Name Section Time Alex Blom 2,5 9:00, 10:00 Sayantan Bose 3,9 9:00, 12:10 Beth Prince 1,4,6 8:00, 10:00, 11:00 Matthew Soyk 7,8 11:00, 12:10 PAGE POINTS SCORE 2 24 pts _________ 3 27 pts _________ 4 14 pts _________ 5 15 pts _________ 6 20 pts _________ TOTAL 100 pts _________ SHOW ALL OF YOUR WORK ON THESE EXAM PAGES. NUMERICAL ANSWERS SHOULD BE GIVEN IN THE CORRECT NUMBER OF SIGNIFICANT FIGURES AND UNITS. PUT YOUR ANSWERS IN THE ANSWER SPACES. THE LAST PAGE CONTAINS A PERIODIC TABLE. THIS SHOULD BE REMOVED AND USED FOR REFERENCE AND SCRATCH PAPER. THIS IS A CLOSED-NOTE, CLOSED-BOOK EXAM. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #6 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE COURSE WEBSITE
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1) (9 pts) Consider the following mechanism (1) CH 3 CHO(g) + I 2 (g) CH 3 I(g) + HI(g) + CO(g) (slow) (2) CH 3 I(g) + HI(g) CH 4 (g) + I 2 (g) (fast) a) What is the overall equation for the reaction? CH 3 CHO(g) CH 4 (g) + CO(g) b) What is/are the catalyst(s) in the reaction if any? I 2 ( g ) c) What is/are the intermediate(s) in the reaction in any? HI(g) and CH 3 I(g) 2) (3 pts) Predict the effect of decreasing the temperature on the amount of the reactants in the following reaction (increase, decrease, or stay the same). C 2 H 2 (g) + H 2 O(g) CH 3 CHO(g); H rxn = -151 kJ Because the reaction is exothermic, the amount of reactants will decrease with decreasing temperature. 3a) (6 pts) Write the equilibrium expression in terms of pressure for the following reaction.
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178Exam1BKeyF06 - STACEY STOFFREGEN FALL 2006 CHEM 178 HOUR...

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