Test2-2011-solutions

Test2-2011-solutions - CHEMISTRY 1E03 Instructor: J....

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Version 1 Page 1 CHEMISTRY 1E03 11 NOVEMBER 2011 Instructor: J. Barbier Answers for Version 1 MCMASTER UNIVERSITY - TERM TEST # 2 - DURATION: 120 minutes This test contains 18 pages and 30 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 26–30 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 test (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. If a problem arises, please ask an invigilator to deal with it for you.
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Version 1 Page 2 QUESTIONS 1–25 ARE WORTH 2 MARKS EACH. 1. Which of the following pairs of substances would not produce a gas when reacting together? A) Zn(s) an HCl(aq) B) S(s) and O 2 (g) C) Ca(s) and H 2 O(l) D) Cu(s) and HNO 3 (aq) E) CuO(s) and H 2 SO 4 (aq) 2 marks Reaction A produces H 2 Reaction B produces SO 3 Reaction C produces H 2 Reaction D produces NO or NO 2 Reaction E: CuO + H 2 SO 4 (aq) CuSO 4 (aq) + H 2 O 2. What is the minimum photon frequency (in Hz or s -1 ) required to ionize one hydrogen atom in its second excited state (i.e. when the electron is in the energy level n = 3)? A) 3.66 10 14 2 m B) 1.10 10 15 0.5 m C) 2.74 10 15 D) 3.29 10 14 E) 8.23 10 15 Transition from n = 3 to n = with E n = -R H /n 2 E = R H /9 = h = R H /9h = 3.66 10 14 Hz 3. Which of the following contains the greatest number of atoms ? A) 2 mol Ar 2 m B) 0.5 mol H 2 O C) 1 mL H 2 gas at 25 C and 1 atm D) 100 g Pb E) 5 g He 1 mL H 2 (g) at 25 C and 1 atm contains n = PV/RT = 1 10 -3 / 0.08206 298.15 = 4.08 10 –5 mole H 2 100 g Pb contains 100/207.2 = 0.483 mole Pb 5 g He contains 5/4.003 = 1.25 mole He
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Version 1 Page 3 4. To determine the enthalpy change for the process C(graphite)
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Test2-2011-solutions - CHEMISTRY 1E03 Instructor: J....

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