CHEM_108_TWO_7

CHEM_108_TWO_7 - CHEMISTRY 108-02 NAME Brent Koplitz Exam...

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NAME CHEMISTRY 108-02 Brent Koplitz Exam #2 March 22,2006 You must show thinking where appropriate! (10 pts) 1. (10 pts) 2. (14 pts) 4. - (24 pts) 5. - (12 pts) 6. (16pts) 7. - 100 pts Useful / Useless Information = 1.0 10-l4
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(10 pts) 1. At temperatures less than 500 K, the reaction between CO and NO2 follows the rate expression Rate = klN021a, the observed law. Which of the three mechanisms best describes the observed rate law? Mechanism 1: NO, + CO - CO, + NO Mechanism 2: NO, + NO, - + NO (slow) + CO - + CO, (fast) Mechanism 3: NO, - + 0 (slow) CO + 0 - CO, (fast) Please explain briefly your reasoning (10 pts) 2.) State whether a 1.0 M solution of each of the following salts would be acidic (A), neutral (N), or basic (B). K2S KOH NH,Cl NaCl N%CO,
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(14 pts) 3a.) Write the equilibrium constant expressions (K's) for the reactions shown below. (ii) MgO(s) + SO,(g) + l/z 02(g) + MgSO,(s) (iii) SiH,(g) + 2 + SiOt (s) + 2H,O(g) 3b.) Consider a tank at 250 OC that contains an equilibrium mixture of Cl,, PCl,, and PCl,. Qualitatively, what will happen to the number of moles of C1, present if: I) PCI, is added to the container.
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CHEM_108_TWO_7 - CHEMISTRY 108-02 NAME Brent Koplitz Exam...

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