key1(2) - CHEM 1212 Test I Multiple Choice (3 points each)...

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CHEM 1212 Test I Multiple Choice (3 points each) 1 What is the name given to a substance that increases the rate of a chemical reaction but is not itself consumed? A) reactant B) product C) intermediate D) catalyst E) element 2 What is the overall order of the reaction below 2 NO(g) + 2 H 2 (g) N 2 (g) + 2 H 2 O(g) if it proceeds via the following rate expression? = k[NO] 2 [H 2 ] A) zero-order B) first-order C) second-order D) third-order E) fourth-order 3 For a second-order decomposition reaction, 2A B rate = k [A] 2 which of the following functions can be plotted versus time to give a straight line? A) [A] B) [A] 2 C) ln D) ln[A] E) 4 The half-life of a first-order decomposition reaction is 8496 seconds. If the initial concentration of reactant is 0.52 M, what is the concentration of reactant after 752 seconds? A) 0.046M B) 0.16M C) 0.26M D) 0.47M E) 0.49M 5 For the second-order reaction below, the initial concentration of reactant A is 0.24 M. If the rate constant for the reaction is 5.5 × 10 -3 M -1 s -1 , what is the concentration of A after 265 seconds? 2A B + C rate = k [A] 2 A) 0.056M B) 0.035M C) 0.18M D) 0.21M E) 0.37M 6 According to collision theory, which condition(s) must be met in order for molecules to react? 1. The reacting molecules must collide with each other to react. 2. A catalyst must be in contact with the reacting molecules for a reaction to occur. 3. The reacting molecules must collide with an orientation that can lead to rearrangement of the atoms. A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1 and 3 7 The Arrhenius equation, k = A relates the rate of reaction and temperature. A plot of ln( k ) versus 1/ T will yield a straight line with a slope of ____. A) -E a /R B) - E a C) A D) ln (-E a /R) E) 1/ RT
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8 The effect of adding a catalyst to a reaction is to A) increase the number of collisions between reactants. B) increase the energy of the products.
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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(2) - CHEM 1212 Test I Multiple Choice (3 points each)...

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