Chem 130 Questions Essay

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14.1 Multiple-Choice and Bimodal Questions 1) Consider the following reaction: [pic] The average rate of appearance of B is given by[pic]. Comparing the rate of appearance of B and the rate of disappearance of A, we get [pic] A) -2/3 B) +2/3 C) -3/2 D) +1 E) +3/2 Answer: B Diff: 1 Page Ref: Sec. 14.2 2) Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: [pic] In a particular experiment at 300 °C, [pic]drops from 0.0100 to 0.00650 M in [pic] The rate of appearance of [pic] for this period is __________ M/s. A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: A Diff: 1 Page Ref: Sec. 14.2 3) Which substance in the reaction below either appears or disappears the fastest? [pic] A) [pic] B) [pic] C) [pic] D) [pic] E) The rates of appearance/disappearance are the same for all of these. Answer: B Diff: 1 Page Ref: Sec. 14.2 4) Consider the following reaction: [pic] The average rate of appearance of C is given by[pic]. Comparing the rate of appearance of C and the rate of disappearance of A, we get[pic]. A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: A Diff: 1 Page Ref: Sec. 14.2 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: [pic] 5) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s. A) [pic] B) [pic] C) [pic] D) 454 E) [pic] Answer: A Diff: 1 Page Ref: Sec. 14.2 6) The average rate of disappearance of A between 20 s and 40 s is __________ mol/s. A) [pic] B) [pic] C) 590 D)[pic] E) [pic] Answer: B Diff: 1 Page Ref: Sec. 14.2 7) The average rate of appearance of B between 20 s and 30 s is __________ mol/s. A) [pic] B) [pic] C) [pic]

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