PBL16 - Name Date 1 The units of"reaction rate are A L mol1...

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Name: __________________________ Date: _____________ 1. The units of "reaction rate" are A) L mol –1 s –1 B) L 2 mol –2 s –1 C) s –1 D) s –2 E) mol L –1 s –1 2. For the reaction BrO 3 - + 5Br - + 6H + 3Br 2 + 3H 2 O at a particular time, -∆ [BrO 3 - ]/ t = 1.5 × 10 - 2 M/s. What is -∆ [Br - ]/ t at the same instant? A) 13 M/s B) 7.5 × 10 - 2 M/s C) 1.5 × 10 - 2 M/s D) 3.0 × 10 - 3 M/s E) 330 M/s 3. For the reaction C 6 H 14 (g) C 6 H 6 (g) + 4H 2 (g), P(H 2 )/ t was found to be 2.5 × 10 - 2 atm/s, where P(H 2 ) is the change in pressure of hydrogen. Determine P(C 6 H 14 )/ t for this reaction at the same time. A) 2.5 × 10 - 2 atm/s B) - 6.2 × 10 - 3 atm/s C) - 2.5 × 10 - 2 atm/s D) 0.10 atm/s E) 6.2 × 10 - 3 atm/s 4. For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H 2 S(g) + O 2 (g) 2S(s) + 2H 2 O(l) A) The reaction is third-order overall. Page 1
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B) The reaction is second-order overall. C) The rate law is, rate = k[H 2 S] 2 [O 2 ]. D) The rate law is, rate = k[H 2 S] [O 2 ]. E) The rate law cannot be determined from the information given. 5. For the hypothetical reaction A + 3B 2C, the rate should be expressed as A) rate = [A]/ t B) rate = - [C]/ C) rate = - 3 ( [B]/ t) D) rate = (1/2) ( [C]/ t) E) rate = (1/3) ( [B]/ t) 6. The reaction A + 2B products has been found to have the rate law, rate = k[A] [B] 2 . While holding the concentration of A constant, the concentration of B is increased from x to 3 x . Predict by what factor the rate of reaction increases. A) 3 B) 6 C) 9 D) 27 E) 30 7. The reaction A + 2B products has the rate law, rate = k[A][B] 3 . If the concentration of B is doubled while that of A is unchanged, by what factor will the rate of reaction increase? A) 2 B) 4 C) 6 D) 8 E) 9 Page 2
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8. The reaction A + 2B products was found to have the rate law, rate = k[A] [B] 2 . Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled. A) 2 B) 4 C) 6 D) 8 E) 9 9. Appropriate units for a first-order rate constant are A) M/s B) 1/M·s C) 1/s D) 1/M 2 ·s 10. It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25 ° C. How long will it take for the reaction to be 90% complete? A) 13.0 min B) 86.0 min C) 137 min D) 222 min E) 284 min Page 3
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11. Use the following data to determine the rate law for the reaction 2NO + H 2 N 2 O + H 2 O. Expt. # [NO] 0 [H 2 ] 0 Initial rate 1 0.021 0.065 1.46 M/min 2 0.021 0.260 1.46 M/min 3 0.042 0.065 5.84 M/min A) rate = k[NO] B) rate = k[NO] 2 C) rate = k[NO][H 2 ] D) rate = k[NO] 2 [H 2 ] E) rate = k[NO] 2 [H 2 ] 2 Page 4
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12. The data below were determined for the reaction S
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This homework help was uploaded on 04/20/2008 for the course CHEM 1300/ taught by Professor Ballester during the Fall '08 term at Nova Southeastern University.

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PBL16 - Name Date 1 The units of"reaction rate are A L mol1...

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