Key1 - CHEM 1212 Test I MULTIPLE CHOICE(3 points each 1 Consider the following reaction 3A 2B The average rate of appearance of B is given by[B/t

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Test I MULTIPLE CHOICE (3 points each). 1) Consider the following reaction: 3 A Æ 2B The average rate of appearance of B is given by [B]/ t. Comparing the rate of appearance of B and the rate of disappearance of A, we get [B]/ t = _____ x (- [A]/ t). A) +2/3 B) -3/2 C) +1 D) -2/3 E) +3/2 2) Of the following, all are valid units for a reaction rate except __________. A) mol/hr B) mol/L-hr C) g/s D) M/s E) mol/L 3) Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO 2 Æ 2NO + O 2 In a particular experiment at 300 o 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) 3.5 x 10 -5 B) 7.0 x 10 -5 C) 7.0 x 10 -3 D) 3.5 x 10 -3 E) 1.8 x 10 -5 4) Which one of the following is not a valid expression for the rate of the reaction below? 4NH 3 + 7O 2 Æ 4NO 2 + 6H 2 O A) - 1/7 [O 2 ]/ t B) 1/6 [H 2 O]/ t C) - 1/4 [NH 3 ]/ t D) 1/4 [NO 2 ]/ t E) All of the above are valid expressions of the reaction rate. 5) A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) Æ 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 The average rate of disappearance of A between 10 s and 20 s is __________ mol/s. A) 9.90 x 10 -3 B) 4.4 x 10 -3 C) 454 D) 1.1 x 10 -3 E) 2.2 x 10 -3 6) If the rate law for the reaction 2A + 3B Æ products is first order in A and second order in B, then the rate law is rate = __________. A) k[A][B] B) k[A] 2 [B] C) k[A] 2 [B] 3 D) k[A] 2 [B] 2 E) k[A][B] 2 7) A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________. A) decrease by a factor of the cube root of 3 B) remain constant C) increase by a factor of 27 D) increase by a factor of 9 E) triple 8) For a first-order reaction, a plot of __________ versus __________ is linear. A) [A]
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This note was uploaded on 11/16/2011 for the course CHEM 1212k taught by Professor Wood during the Spring '08 term at Valdosta State University .

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Key1 - CHEM 1212 Test I MULTIPLE CHOICE(3 points each 1 Consider the following reaction 3A 2B The average rate of appearance of B is given by[B/t

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