2005 - Chem 2 Key #1 Exam #2 March 4, 2005 1. The following...

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Chem 2 Exam #2 March 4, 2005 Key #1 1. The following reaction was observed for carbon monoxide and hydrogen: CO (g) + 2 H 2(g) 6 CH 3 OH (g) The concentration of H 2 was measured as a function of time. The rate of the reaction is equal to: a) b) c) rate H t =− Δ Δ [] 2 rate H t = Δ Δ 2 rate H t = 2 2 Δ Δ d) e) rate H t = Δ Δ 2 2 rate H t Δ Δ 2 2 2. Using the data below, estimate the rate of the reaction at 3.0 s for the reaction in Question #1. time, s [CO], atm 0 0.100 1.0 0.099 2.0 0.098 3.0 0.097 4.0 0.096 a) 0.003 atm/s b) 0.001 atm/s c) 0.004 atm/s d) 0.097 atm/s e) -0.003 atm/s
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3. Acetone (CH 3 -CO-CH 3 ) reacts with bromine in the following reaction: CH 3 -CO-CH 3 + Br 2 6 CH 3 -CO-CH 2 Br + HBr The following data were obtained in 0.05 M H + . Experiment # [acetone], M [Br 2 ], M initial rate, M /s 1 0.30 0.050 5.7 x 10 -5 2 0.60 0.050 1.1 x 10 -4 3 0.60 0.10 1.1 x 10 -4 What is the order of the reaction with respect to acetone? a) first order b) second order c) zero order d) third order e) half order 4. Using the data in Question #3, what is the order of the reaction with respect to Br 2 ? a) first order b) second order c) zero order d) third order e) half order 5. For the reaction in Question #3, if the [H + ] was increased to 0.10 M in Experiment #1, the initial rate was 1.1 x 10 -4 . This indicates that H + was: a) an inhibitor b) an intermediate c) a catalyst d) none of the above
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6. For the reaction below: 2 ClO 2(aq) + 2 OH - (aq) 6 ClO 3 - (aq) + ClO 2 - (aq) + H 2 O the following empirical rate law was obtained: rate = k [ClO 2 ] 2 [OH - ] and the initial rate was 0.0248 M /s for [ClO 2 ] = 0.060 M and [OH-] = 0.030 M . What is the value of k? a) 230 M /s b) 14 M -1 s -1 c) 14 M -2 s -1 d) 230 M -2 s -1 e) 2.7 x 10 -6 M 3 s -1 7. In Question #6, what will happen to the initial rate of the reaction if the concentration of ClO 2 is doubled to 0.12 atm, and the concentration of OH - remains constant at 0.030 M ? a) the initial rate will double b) the initial rate will be unchanged c) the initial rate will decrease by ½ d) the initial rate will quadruple e) the initial rate will decrease by 1/4 8. In Question #6, what will happen to the initial rate of the reaction if the concentration of OH - is doubled to 0.060 atm, and the concentration of ClO 2 remains constant at 0.060 M ? a) the initial rate will double b) the initial rate will be unchanged c) the initial rate will decrease by ½ d) the initial rate will quadruple e) the initial rate will decrease by 1/4
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9. For the following reaction, the activation energy for the forward reaction was found to be 33.3 kJ.
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This note was uploaded on 04/07/2008 for the course CHEM 002 taught by Professor Ryan during the Spring '08 term at Marquette.

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2005 - Chem 2 Key #1 Exam #2 March 4, 2005 1. The following...

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