230_F09_E3_Wkst1 - CHEM 230 F09 E3 Worksheet 1 1 1) Ca(OH)...

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Unformatted text preview: CHEM 230 F09 E3 Worksheet 1 1 1) Ca(OH) 2 has K sp = 10-6 . If 0.1 mol of Ca(OH) 2 was added to 1 L of pure water, what would be the approximate pH of the resulting solution? A) 2 B) 8 C) 12 D) 13 E) None of the above 2) Phenolphthalein is an acid-base indicator that is colorless in its acid form and pink in its basic form, changing at pH = 8.5. Bromcresol green is yellow in its acidic form and blue in its basic form, changing at pH = 4.8. A solution is colorless in phenolphthalein and blue in bromcresol green. Therefore we can conclude that the pH of the solution is __________. A) exactly 7.0 B) greater than 8. C) between 7.0 and 8.5 D) between 4.8 and 8.5 E) less than 4.8 3) A weak base with pK a = 10 is titrated with a strong acid. At what pH will the stoichiometric point occur? A) Less than 7 B) Exactly 7 C) Greater than 7 4) Which characteristic of an electrochemical cell is affected by the number of electrons that appears while balancing a redox reaction? A) the voltage B) the current the current depends on how fast the electrons are drawn by the external circuit C) the work = -nF ! E D) B & C E) all of the above F) none of the above 5) Iron is oxidized from Fe 2+ to Fe 3+ by MnO 4-2 in aqueous acid solution. When the reaction Fe 2+ (aq) + MnO 4 1- (aq) " Fe 3+ (aq) + Mn 2+ (aq) is balanced in acid, what is the coefficient of H 2 O? A) 1 B) 2 C) 3 D) 4 E) 5 CHEM 230 F09 E3 Worksheet 1 2 6) Which of the following is the strongest reducing agent? A) K (s) B) Cr 2+ (aq) C) H 2(g) D) Fe 2+ (aq) 7) How long would it take to plate 4.53 g of nickel onto an electrode from a solution of NiCl 2 at a current of 12.34 amps? A) 1447 sec B) 17850 sec C) 7855 sec D) None of the above 8) An overall reaction is made up of two elementary reactions. After the first step, the concentration of one particular species has increased. What could be the role of the species? A) Product B) Reactant C) Intermediate D) Catalyst E) Either (a) or (c) F) Either (b) or (d) 9) The overall reaction below has the reaction mechanism listed. The overall rate is dependent on the pH of the solution. Which step is the rate-determining step? ClO- (aq) + Br - (aq) ! BrO- (aq) + Cl- (aq) Step 1: ClO- (aq) + H 2 O (l) ! HOCl- (aq) + OH- (aq) Step 2: Br - (aq) + HOCl- (aq) ! HOBr (aq) + Cl- (aq) Step 3: OH- (aq) + HOBr (aq) ! H 2 O (l) + BrO- (aq) A) step 1 is the rate determining step B) step 2 is the rate determining step C) step 3 is the rate determining step D) More than one step is the rate determining step 4.53 gNi * 1 molNi 58.7 gNi * 2 mol e " 1 moleNi + 2 * 96485 C 1 mole " * s 12.34 C = 1217 s CHEM 230 F09 E3 Worksheet 1 3 10) The overall reaction below has the rate law shown. The reaction mechanism is outlined below. Which step is the rate-determining step?...
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This note was uploaded on 07/11/2011 for the course CHEM 230 taught by Professor Sharp during the Spring '08 term at University of Michigan.

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230_F09_E3_Wkst1 - CHEM 230 F09 E3 Worksheet 1 1 1) Ca(OH)...

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