Final - Spring 2006

Final - Spring 2006 - Name _ Chem 0120 - Golde Section...

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Name ________________________ Signature ____________________ Chem 0120 - Golde Section Final Exam Spring Term 2006 Tuesday, April 25 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. 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 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. Which is the correct equilibrium constant expression for the following reaction? Zn(OH) 2 (s) + 2 OH - (aq) Zn(OH) 4 2- (aq) a) K c = 2- 4 - 2 [Zn(OH) ] [Zn(OH) ][OH ] b) K c = - 2 2- 4 [OH ] [Zn(OH) ] c) K c = 2- 4 - 2 [Zn(OH) ] [OH ] d) K c = 2- -2 4 - -1 2 [Zn(OH) ] [Zn(OH) ][OH ] e) K c = 2- 4 - 2 [Zn(OH) ] [Zn(OH) ] + 2[OH ] 2. A flask contains 30.0mL of 0.155M HCl. To the flask were added 7.55 x 10 -3 mole of NaOH. The following acid-base reaction took place: HCl(aq) + NaOH(aq) NaCl(aq) + H 2 O(l) (i) Which is the limiting reagent? (ii) What is the molar concentration of the excess reagent following the reaction? Assume that the volume of the solution is still 30.0mL. (i) (ii) a) HCl [HCl] = 4.65 x 10 -3 M b) HCl [NaOH] = 0.0967M c) HCl [NaOH] = 0.252M d) NaOH [HCl] = 0.145M e) NaOH [NaOH] = 0.252M f) NaOH [HCl] = 0.0186M
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3. At a certain temperature, the reaction: CO 2 (g) + C(s) 2 CO(g) has an equilibrium constant, K c = 0.168. If pure CO 2 , with an initial concentration of 0.755M, is mixed with solid C (no CO is present initially), what is the concentration of CO when equilibrium is established? The volume of the container does not change. *** Show your work
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Final - Spring 2006 - Name _ Chem 0120 - Golde Section...

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