103B Exam 1-C - Exam I master Page 1 Chemistry 103B Exam 1...

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Page 1 Exam I master 4/10/2008 12:19:34 AM http://www.chem.arizona.edu/~kellerp/exams/Exam1/Exam1Can/Exam1Can.htm Chemistry 103B Exam 1 Answer Key Form C 1. (2) A reaction has just one elementary step , C 2 2 C [slow]. The rate constant k has the value 7.1 x 10 -2 s -1 . At the start of the reaction (t = 0) the concentrations of C 2 and C were 0.300mol/L and 0 mol/L, respectively . What is the concentration of product after 18 seconds ? The elementary step is unimolecular. The concentration of C 2 after 18 s is The concentration of C 2 decreased by 0.300 0.0836= 0.2164. The concentration of C increased by twice that amount, 0.433mol/L. (a) 0.084mol/L (b) 0.279mol/L (c) 0.433mol/L (d) 0.216mol/L (e) 0.000mol/L 2. (2) Carbon-14 is a radioactive isotope with a half lifeof 5730years. What is the rate constant for its decay in units of years -1 ? (a) 5.25 x10 -5 years -1 (b) 3.49 x10 -4 years -1 (c) 1.75 x10 -4 years -1 (d) 3.97 x10 -4 years -1 (e) 1.21x10 -4 years -1
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Page 2 Exam I master 4/10/2008 12:19:34 AM
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103B Exam 1-C - Exam I master Page 1 Chemistry 103B Exam 1...

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