06ex3practice - CHEM 260. Practice exam 3. June 13, 2006...

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CHEM 260. Practice exam 3. June 13, 2006 PRINT NAME_______________________ ________________________ first last “To give an idea of the significance of this work it suffices to say that a very considerable part of the laws and relationships which have, in the mean time, been discovered in physical chemistry and which have led to such an astonishing development of the field within the last decade are found in this paper more or less thoroughly developed. …. . . Why did this work achieve no success commensurate with its importance? Why immediately upon its appearance, did not those effects follow which have since been attained in another way? There are many answers. Above all, the blame must be laid to the uninviting form in which the author recorded his results. In a strictly mathematical manner, and with a text so concentrated that every page requires the active cooperation of the reader, the author takes us through his 700 equations, only seldom illuminating his results with any suggestive applications.” Wilhelm Ostwald commenting, in 1896, on Gibbs’ classical paper “On Heterogeneous Equilibria”, which appeared in the Journal of The New England Academy of Sciences in 1876 TABLE I, USEFUL INFORMATION k B = Boltzmann's constant = 1.38 x 10 -23 J/K h = Planck's constant = 6.6 x 10 -34 Jsec C = velocity of light = 3 x 10 8 m/sec m e = the mass of the electron = 9.1 x 10 -31 kg a 0 = Bohr radius = 53 pm N a = Avogadro’s number = 6.022 × 10 23 molecules/mol 1amu = 1.67 × 10 -27 kg Question I(%) Short Answer questions. *1. Under certain conditions, the rate law for the reaction: S 2 O 8 = + 3I - 2SO 4 = + I 3 - is: -d [ S 2 O 8 = ]/ dt = k[S 2 O 8 = ][I - 3 ] 2 The order of the overall reaction is: a. 0 b. 1 c. 2 d. 3 e. 4 *2 True or False . A likely mechanism for the above reaction involves a termolecular collision between two I 3 - ions and an S 2 O 8 = ion. 1
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*3 True or False . A possible mechanism for the above reaction involves a termolecular collision between two I 3 - ions and an S 2 O 8 = ion. *4. The half-life of radioactive carbon 14 is approximately 5730 years. If a sample of soot found at an old camp-site of some cave-people has a level of radioactivity equal to about one eighth the level of the same amount of soot produced in a fire today, the approximate age of the camp-site is: a. 5730 years b. 11460 years c. 17190 years d. 22920 years . e. 2865 years *5. A catalyst increases the rate of a chemical reaction by lowering the _______ _______ _______ for the reaction . *6.
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This test prep was uploaded on 04/09/2008 for the course CHEM 260/261 taught by Professor Davids.newman during the Spring '06 term at University of Michigan.

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06ex3practice - CHEM 260. Practice exam 3. June 13, 2006...

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