Exam-2010-answers - Name Student Number CHEMISTRY 1E03 13...

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Name: ________________________ Student Number: _______________ continued on next page . .. Version 1 Page 1 CHEMISTRY 1E03 13 DECEMBER 2010 McMASTER UNIVERSITY - FINAL EXMINATION - answers DURATION: 3 HOURS Instructor: J. Barbier This examination paper contains 21 pages and 35 multiple-choice questions . The last pages include extra blank pages for rough work, a page with some useful data and equations, and a Periodic Table. You may tear off the last five pages. You are responsible for ensuring that your copy of the question paper is complete . Bring any discrepancy to the attention of your invigilator. Questions 1-25 are each worth 2 marks, questions 26-35 are each worth 3 marks. There is no penalty for incorrect answers. Answer all questions on the answer sheet, in pencil . Instructions for entering multiple-choice answers are given on page 2. Select one answer only for each question. These question sheets must be returned with your answer sheet. However, no work written on the question sheets will be marked . You must enter your full name and student number on this question sheet, as well as on the answer sheet. Your invigilator will be checking your student card for identification. Make sure to enter the correct version number of your examination (shown at the bottom of each page) in the correct column on the answer sheet (see instructions on page 2). Only Casio FX 991 electronic calculators may be used; but they must NOT be transferred between students. Use of periodic tables or any aids other than those provided, is not allowed. Note: Academic dishonesty may include, among other actions, communication of any kind (verbal, visual, etc.) between students, sharing of materials between students, copying or looking at other students’ work.
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Name: ________________________ Student Number: _______________ continued on next page . .. Version 1 Page 2 QUESTIONS 1–25 ARE WORTH 2 MARKS EACH. 1. The electrolysis of NaCl(aq) yields chlorine gas and hydrogen gas as per the u nbalanced reaction below: Cl (aq) + H 2 O(l) OH (aq) + H 2 (g) + Cl 2 (g). Balance the reaction and identify the false statement below. A) The electrolysis of 1 mole of sodium chloride produces 2 moles of hydrogen gas. B) The oxidation state of oxygen remains unchanged. C) A total of 2 moles of electrons are transferred during the production of 1 mole of chlorine gas. D) Water acts as an oxidizing agent in the reaction. E) The pH of the NaCl(aq) solution changes from neutral to basic during electrolysis. 2. As 20.0 g of solid NH 4 NO 3 is dissolved in 100.0 cm 3 of pure water, the temperature of the solution changes from 22.3°C to 7.0°C. Calculate the e nthalpy of dissolution of NH 4 NO 3 ( in kJ mol –1 ). Assume that the specific heat of the solution is equal to that of pure water (4.184 J·g –1 ·K –1 ). A)
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Exam-2010-answers - Name Student Number CHEMISTRY 1E03 13...

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