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122 midtermII V2final sp05 wkey

122 midtermII V2final sp05 wkey - Midterm II Chemistry 122...

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Midterm II, Chemistry 122 Spring 2005 Wednesday May 18th 6:30-7:48 PM, Dr. Allen (25 questions; each question worth 7 points) Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Consider the following reaction: 3A ¬ 2B The average rate of appearance of B is given by D [B]/ D t. Comparing the rate of appearance of B and the rate of disappearance of A, we get D [B]/ D t = _____ x (- D [A]/ D t). A) +2/3 B) +3/2 C) +1 D) -3/2 E) -2/3 2) Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO 2 ¬ 2NO + O 2 In a particular experiment at 300 e C, [NO 2 ] drops from 0.0100 to 0.00650 M in 100 s. The rate of appearance of O 2 for this period is __________ M/s. A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) ¬B(g). The following data are obtained for [A] as the reaction proceeds: Time (s) 1 10 20 30 40 Moles of A 0.124 0.110 0.088 0.073 0.054 3) The average rate of appearance of B between 20 s and 30 s is __________ mol/s. The peroxydisulfate ion (S 2 O 8 2- ) reacts with the iodide ion in aqueous solution via the reaction: S 2 O 8 2- (aq) + 3I - ¬ 2SO 4 (aq) + I3 - (aq) An aqueous solution containing 0.050 M of S 2 O 8 2- i on and 0.072 M of I - is prepared, and the progress of the reaction followed by measuring [I - ]. The data obtained is given in the table below. Time (s) 0 400 800 1200 1600 [I - ] (M) 0.072 0.057 0.046 0.037 0.029
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