2005 Midterm 2 Solutions

2005 Midterm 2 Solutions - Name Student Number Chemistry...

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Name: Student Number: Chemistry 1A03/1E03 Test 2 November 11, 2005 McMaster University VERSION 1 – ANSWERS & Full Solutions Instructors: A. Bain, J. Barbier, R. Dumont. P. Lock, I. Vargas-Baca Duration: 120 minutes This test contains 22 numbered pages printed on both sides. There are 30 multiple-choice questions appearing on pages numbered 3 to 18. Pages 19 and 20 are extra space for rough work. Page 21 includes some useful data and equations, and there is a periodic table on page 22. You may tear off the last page to view the periodic table and the data provided. You must enter your 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. 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 to 23 are each worth 2 marks, questions 24 – 30 are each worth 3 marks; the total marks available are 67. There is no additional penalty for incorrect answers. BE SURE TO ENTER THE CORRECT VERSION OF YOUR TEST (shown near the top of page 1), IN THE SPACE PROVIDED ON THE ANSWER SHEET. ANSWER ALL QUESTIONS ON THE ANSWER SHEET, IN PENCIL. Instructions for entering multiple-choice answers are given on page 2. SELECT ONE AND ONLY ONE ANSWER FOR EACH QUESTION from the answers (A) through (E). No work written on the question sheets will be marked . The question sheets may be collected and reviewed in cases of suspected academic dishonesty. 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 you have a problem please ask the invigilator to deal with it for you. Do not make contact with other students directly. Try to keep your eyes on your own paper – looking around the room may be interpreted as an attempt to copy. 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. Page 1 of 18 Continued on next page
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Name: Student Number: You are writing VERSION 1 of this test. Make sure you have correctly entered your version number (“1”) in the correct column on your scan sheet (see p. 2 for details). Questions 1 through 23 are worth two (2) marks each. ANSWERS are shown in blue. 1. A sample of a barium salt weighing 0.6760 g was completely dissolved in water and treated with an excess of sodium sulfate, Na 2 SO 4 . A precipitate formed which was dried and weighed, yielding 0.4105 g. What is the mass percentage of barium in the original sample? The reaction will look something like:
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This note was uploaded on 02/14/2011 for the course CHEM 1b03 taught by Professor Hughes during the Spring '11 term at McMaster University.

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2005 Midterm 2 Solutions - Name Student Number Chemistry...

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