S10FA1-AK - Name _ Chem 0120 - Golde Spring Term 2010...

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Name ________________________ Signature ____________________ Chem 0120 - Golde FINAL EXAM Spring Term 2010 Thursday, April 29 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 29 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. Answer Question 30 (8 points) on the exam sheet. *** The last 18 points will be given for your written answers to questions marked *** in the exam. The answer key will be posted on our Courseweb site, hopefully Thursday evening. 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) 0 ° C = 273 K G ° = -nE ° F F = 96,500 Coul/mol e - E = E o - RT nF ln(Q) = E ° - 0.0257 ln(Q) n [at 298K] 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 and Acids and Bases 1. In a precipitation experiment, Pb(NO 3 ) 2 solution was added to KI solution and the following equilibrium was established: PbI 2 (s) Pb 2+ (aq) + 2 I - (aq), K sp = K c = 6.50 x 10 -9 At equilibrium, the Pb 2+ concentration was 0.0256M. Determine the I - molar concentration at equilibrium. A) 1.87 x 10 -3 M B) 1.60 x 10 -5 M C) 5.08 x 10 -7 M D) 0.0252M E) 0.0512M F) 0.250M G) 5.04 x 10 -4 M H) 3.23 x 10 -3 M I) 0.124M J) 6.41 x 10 -5 M 2. A bottle contained a 0.0318M solution of a weak monoprotic acid, HX. This can be taken as the initial concentration. A sample taken from the bottle was found to have a pH of 4.170. Determine the acid ionization constant, K a , of this acid. *** Show your work A) 1.03 x 10 -3 B) 1.44 x 10 -7 C) 1.63 x 10 -2 D) 8.32 x 10 -6 E) 6.76 x 10 -5 F) 2.13 x 10 -3 G) 1.32 x 10 -4 H) 2.15 x 10 -6 I) 7.63 x 10 -3 J) 2.76 x 10 -7
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3. Consider the following reaction: A(g) + 2 B(g) 2 C(g) + D(g) Which one statement is definitely true when equilibrium is attained? A) All the species, A, B, C and D, have the same concentration B) ΔG o = 0 C) The rate constant for the left-to-right reaction equals the rate constant for the right-to-left reaction. D) The rate for the left-to-right reaction equals the rate for the right-to-left reaction.
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This note was uploaded on 02/20/2011 for the course CHEM 110 taught by Professor Dr.huston during the Spring '06 term at Pittsburgh.

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S10FA1-AK - Name _ Chem 0120 - Golde Spring Term 2010...

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