Chem0120 Final Exam

Chem0120 Final Exam - Name _ Chem 0120 Spring Term 2007...

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Name ________________________ Signature ____________________ Chem 0120 FINAL EXAM Spring Term 2007 Thursday, April 26 INSTRUCTIONS DO NOT TEAR ANY PAGES OFF YOUR EXAM, EXCEPT THE LAST PAGE. PRINT AND SIGN YOUR NAME AT THE TOP OF THIS PAGE. The exam contains 30 multiple-choice questions (6 points each) to be answered on the machine-scored sheet, using a soft pencil. Be sure to write and code in your name on this sheet (last name – space - first name). Do all your working on the exam sheets. *** The last 20 points will be given for your written answers to questions marked *** in the exam. USEFUL INFORMATION SEE BACK PAGE GOOD LUCK GOOD LUCK GOOD LUCK ***Have you answered the QUESTION??*** ***Does your Answer MAKE SENSE??***
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USEFUL INFORMATION G = H - T ⋅∆ S Charge = current x time G ° = -RT ln K R = 8.31 J/mol K G = G ° + RT ln Q G ° = -nE ° F F = 96,500 Coul/mol e - E = E ° - 0.0257 n n Q 0 ° C = 273 K t 0 [A] ln [A] = -kt ln 1 2 k k = E R T T T T a 2 1 1 2 - t ½ = ln 2 k or ln 1 2 k k = 2 1 a T 1 - T 1 R E HA + H 2 O H 3 O + + A - , K c = K a pH = -log 10 [H 3 O + ] M = mol/L K w = 1.0 x 10 -14 = [H 3 O + ] [OH - ] K w = K a .K b Avogadro’s Number = 6.02 x 10 23 /mol 6.02 x 10 23 amu = 1 g For ax 2 + bx + c = 0, x = - ± - b b ac a 2 4 2 > means greater than; < means less than
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1. Consider the reaction: A(g) + 2 B(g) 2 C(g) When this reaction reaches equilibrium , which of the following statements is/are definitely correct ? 1. The concentration of B is twice that of A 2. The rate of the forward reaction (left-to-right) is equal to the rate of the reverse reaction (right-to-left) 3. 2 x [C] [A] x 2 x [B] = K c , where K c is the equilibrium constant of the reaction a) 1 only b) 2 only c) 3 only d) 1 and 2 e) 1 and 3 f) 2 and 3 g) All of them h) None of them 2. Halogens can react with each other, as follows: Br 2 (g) + Cl 2 (g) 2 BrCl(g) At 350K, this reaction was carried out in a reaction vessel and came to equilibrium, with the following concentrations: [Br 2 ] = 0.0550M, [Cl 2 ] = 0.0850M; [BrCl] = 0.0150M. No chemicals were added to or removed from the reaction vessel, but the temperature was then increased to 380K, at which temperature the new equilibrium constant was K c = 0.0175. Reaction occurred to reach the new position of equilibrium. Determine the equilibrium concentrations of Br 2 and BrCl at 380K. *** Show your work [Br 2 ] [BrCl] a) 0.0506M 0.0238M b) 0.0506M 0.0106M c) 0.0578M 0.0094M d) 0.0578M 0.0122M e) 0.0700M 0.0150M f) 0.0700M 0.2100M 3. Which condition makes it certain that reaction will occur in the Left-to-Right direction? a) Q < K
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This note was uploaded on 04/13/2008 for the course CHEM 0120 taught by Professor Golde during the Spring '07 term at Pittsburgh.

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Chem0120 Final Exam - Name _ Chem 0120 Spring Term 2007...

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