Final - Spring 2007

Final - Spring 2007 - Name Chem 0120 Golde Section Spring...

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Name ________________________ Signature ____________________ Chem 0120 - Golde Section 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. An answer key will be available in Room 101 Chevron after the exam (about 2-3pm). It will also be posted on our Courseweb site. 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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Equilibria, Acids and Bases and Solubility 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
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