CH116_PracticeExam2Key

CH116_PracticeExam2Key - page 1 of 8 KEY Name _ Last 5...

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page 1 of 8 Name _____________________________________ KEY Last 5 digits of Student Number: XXX – X ___ – ___ ___ ___ ___ Chem 116 Sample Examination #2 This exam consists of eight (8) pages, including this cover page. Be sure your copy is complete before beginning your work. If this test packet is defective, ask for another one. A copy of the Periodic Table is attached at the back of the exam. You may remove it and use the back side of the Periodic Table as scratch paper. No work on scratch paper will be graded or collected. The following information may be useful: Equations More Equations Arrhenius equation: TR E a eA k ± k t half 693 . 0 for a first-order reaction Constants of nature R = 8.314 = 0.08206 K mol atm L x x Differential rate laws: 0. rate of change of [A] = k [A] 0 1. rate of change of [A] = k [A] 1 2. rate of change of [A] = k [A] 2 Integrated rate laws: 0. [A] = [A] o + k t 1. > @ > @ tk ± o A ln A ln 2. >@ ² o A 1 A 1 K mol J x DO NOT WRITE BELOW THIS LINE Part I: Q u e s t i o n s 1 - 7 Q u e s t i o n 8 Q u e s t i o n 9 Q u e s t i o n 1 0 _________ (maximum 35) _________ (maximum 7) _________ (maximum 8) _________ (maximum 10) Part II: Q u e s t i o n 1 Q u e s t i o n 2 E x t r a c r e d i t _________ (maximum 20) _________ (maximum 20) _________ (maximum 2) Total (out of 100) Disclaimer: This is a copy of a typical Exam 2 given in Chem 116 during the academic year. Your test will be different. This test is being posted to give you a sense of the format, style, scope and level of a typical test on this material. This test may have questions on topics that may not be covered on your exam. Moreover, your test may have questions on topics not covered in this practice exam. Posting this test in no way limits the format, style, scope and level of the test that you will take. Do not limit your preparation to the material in this practice exam.
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page 2 of 8 Part I. Multiple-Choice or Short Response There are 10 questions. Questions 1-7 are multiple-choice and are each worth 5 points. Question 8 is worth 7 points. Question 9 is worth 8 points. Question 10 is worth 10 points. 1. An aqueous solution contains 2.05 g of an unknown, non-ionic solute in 50.0 g of water. The solution boils at 100.062 ºC. What is the molar mass of the unknown solute? The boiling point constant for water is 0.5121 ºC/ m . A A) 340 g/mol mK iT bp bp ' and the solute is non-ionic so i = 1 B) 1290 g/mol m = ±² ¸ ¹ · ¨ © § m C 5121 . 0 1 C 062 . 0
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CH116_PracticeExam2Key - page 1 of 8 KEY Name _ Last 5...

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