Final Exam Practice - General and Inorganic Chemistry | CEM 142, Exams of Inorganic Chemistry

Download Final Exam Practice - General and Inorganic Chemistry | CEM 142 and more Exams Inorganic Chemistry in PDF only on Docsity!

Final Examination Fall 2003 127 FINAL EXAMINATION CHEMISTRY 142 FALL 2003 Tuesday December 9th 2003 1. ‘Two ways in increase the rate of a reaction are to increase the temperature and to add a catalyst. The increase in tate in each case is due to: Raising the temperature... Adding a catalyst... a. increases the collisions with sufficient energy lowers activation energy b. decreases the collisions with sufficient energy raises the activation energy c. drives the equilibrium to the right makes reaction more favorable d. produces a more endothermic reaction makes AG more negative e. lowers the activation energy increases the energy of the products 2. The decomposition of phosphine, PH,, follows first-order kinetics. 4PH,@ = P@ + 6H) The half-life for the reaction at 550°C is 81.3 seconds. How long does it take for 99% of a phosphine sample to decompose? a 9.2x 104s b. 85x 10%s c. 5.7x10%s d. 85x 1071s 5.4 x 107 s f£ 8.0x 10s g 82x107+s h. 80x J0's 3. Given the initial rate data for the decomposition reaction: A 7 2B determine the rate expression for the reaction. [Al, M initial rate (M /s) 0.125 5.14 x 10? 0.175 1.01 x 104 0.250 2.06 x 103 a. rate=4.11 x 103[A] b. rate =4.11 x 10°[A}? ©. tate = 3.29 x 104[A]? d. tate = 5.14 x 10? e. tate = 3.29 x 104[A] f£ rate = 5.14 x 107[A][B]? 4, A large equilibrium constant... indicates that a reaction has a large rate constant is obtained with catalysts. indicates the formation of products is favored. is common for equilibria at high temperatures. is common for equilibria at high pressures. indicates that a reaction has a small activation barrier. wme ao oe indicates that the reaction will occur.