2003 Test 2 - Solutions

2003 Test 2 - Solutions - Name Student number Chemistry...

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Name: Page 1 of 15 Student number: Continued on next page. Chemistry 1AA3 Midterm Test March 14 th , 2003 McMaster University Version A – Solutions & part marks Instructors: M. Austen, P. Lock Duration: 120 minutes This test contains 18 numbered pages. There are 26 multiple-choice questions appearing on pages numbered 3 to 15, and a periodic table on page 18. Page 17 is for rough work. You may tear off the last page to view the periodic table and the first page to view the data below. Question 1 identifies the version of the test that you are writing. Be sure to answer this question correctly. Questions 2 to 21 are each worth 2 marks, questions 22 – 26 are each worth 3 marks; the total marks available are 55. There is no additional penalty for incorrect answers. You are responsible for ensuring that your copy of the question paper is complete. Bring any discrepancy to the attention of your invigilator. ANSWER ALL QUESTIONS ON THE ANSWER SHEET PROVIDED. No work written on the question sheets will be marked. Instructions for entering multiple-choice answers are given on page 2. Select one answer in each question from the answers (A) through (E). Your answers to all questions must be entered onto THE ANSWER SHEET IN PENCIL . Enter one and only one answer for each question. Only Casio FX 991 electronic calculators may be used; but they must NOT be transferred between students. Use of periodic tables, other than the table on page 18, is not allowed. Some general data are provided on this page. Other data appears with the questions. R = 8.314 J/(K mol) = 0.08206 L atm/(K mol) N A = 6.022 × 10 23 mol 1 1 atm = 760 mm Hg = 101.325 kPa 0 ° C = 273.15 K K w = 1.0 × 10 14 k = Ae -Ea /RT ln[A] - ln[A] o = ln ([A]/[A] o ) = – kt
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Name: Page 2 of 15 Student number: Continued on next page. You are writing VERSION A . Please choose answer A for question 1. (A) YES (B) no (C) no (D) no (E) no Questions 2 through 21 are worth two (2) marks each. Answers have been highlighted in blue . Part marks are noted in green. 1. For the reaction N 2 (g) + 3H 2 (g) Æ 2NH 3 (g), under some conditions, the instantaneous rate of appearance of ammonia ( NH 3 ) is 1.00 × 10 5 mol of NH 3 / L·s. At the same instant, what is the rate of disappearance of hydrogen gas ( H 2 )? (A) 5.00 × 10 6 mol of H 2 / L·s (B) 6.67 × 10 6 mol of H 2 / L·s (C) 1.00 × 10 5 mol of H 2 / L·s (D) 1.50 × 10 5 mol of H 2 / L·s 2 (E) 3.00 × 10 5 mol of H 2 / L·s 2. Which of the following rate laws have an overall order of two ? (i) Rate = k[I] 2 [Ar] 1 2 – 1 = 1 (ii) Rate = k[H 2 ] 3/2 [Br 2 ] 1/2 3/2 + ½ = 4/2 = 2 (iii) Rate = k[S 2 O 8 2 ] [I ] 1 + 1 = 2 (iv) Rate = k[NO 2 ] 2 2 = 2 Overall order = sum of exponents in the rate law (A) (i) and (iv) (B) (i), (ii) and (iii) (C) (ii) and (iii) 1 (D) (ii), (iii) and (iv) 2 (E) (iv) only 0.5 [ ] [] × = = = s L mol dt H d dt NH d dt H d dt H d dt NH d 5 2 3 2 2 3 10 00 . 1 2 3 2 3 3 1 2 1
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Name: Page 3 of 15 Student number: Continued on next page.
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2003 Test 2 - Solutions - Name Student number Chemistry...

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