Exam 1-Winter 2011

Exam 1-Winter 2011 - Chemistry 100A Exam I Winter Quarter,...

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1 Chemistry 100A Exam I Winter Quarter, 2011 University of California, San Diego DIRECTIONS ********** Turn off your cell phone ********** READ THIS FIRST This test is designed to be taken with the provided Scantron . You must use a #2 lead pencil to take the test. There is only one correct answer to each question, and there is no penalty for incorrect responses. You should answer every question. DO NOT take the examination booklet with you when you leave the room. You may, however, write on the examination booklet. MARK YOUR SCANTRON SHEET Print your last name, first name, and middle name on the line next to NAME. On the line next to SUBJECT, enter A01, A03, A04, or A05. Write and bubble in your ID number below I.D. NUMBER. When bubbling, “A” must be replaced by “1”. If this is not done correctly, your scantron will not be graded. Ignore TEST FORM and EXAM NUMBER. There are two columns on the front page. Use only the column that starts with 1. When you have selected your answer, blacken the corresponding space on the answer sheet. Make a heavy, full mark, but no stray marks. If you decide to change an answer, erase ANY unwanted mark carefully and completely. Any question for which more than one response has been blackened will be counted as wrong. Any question that is unanswered will also be counted as wrong. DO THIS AFTER THE TEST For the answer key, go to WebCT Chem100A > Exams > Exam_I_Key. This is a 25-question exam. Each question is worth 4 points. Maximum possible points is 100 (=4 x 25)
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2 Make sure your test booklet has the following type and number of questions: Self Study Exercise (Questions 1 – 6) Buret Preparation and Calibration (Questions 7 – 12) Homogeneous Chemical Equilibrium (Questions 13 – 19) Hydroxide and Carbonate Mixture and Citric Acid in Soft Drink (Questions 20 – 25)
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3 Self Study Exercise (Questions 1 – 6) 1. In the following spreadsheet, the number that appears in D8 is the same as a. 2 10 5 . 1 * b. 2 10 5 . 1 c. 2 5 . 1 e , where e = 2.718282 d. 2 5 . 1 e e. None of the above. 2. The formula bar in the figure below shows that “=A2/B$2” is in cell B4. Now, suppose you are going to “copy” the formula from B4 to C4 (i.e., select B4 then hold and drag the “fill handle” of B4 horizontally to C4), the number that will appear in C4 is going to be? a. 1 b. 2
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4 c. 24 d. 36 e. none of the above.* Ans. The formula in C4 is going to be =B2/C$2. Since there is nothing in C$2, #DIV/0! will appear in C4. 3. The following spreadsheet gives a set of measured values along with the mean and standard deviation (sd). Using these numbers, determine the 95% confidence interval of these five numbers. Replicates Measurements 1 0.514 2 0.503 3 0.486 4 0.497 5 0.472 Mean 0.4944 SD 0.016102795 a. 0.461 – 0.528 b. 0.474 – 0.514* c. 0.476 – 0.513 d. 0.483 – 0.505 e. 0.484 – 0.505 Ans. For this set of 5 replicates, the degree of freedom is 4 and at 95% confidence interval, the student t-value is 2.78. Thus the interval is 2.78 0.0161 0.4944 5  4. Given the following numbers Which of the following is the mode for this set of numbers?
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Exam 1-Winter 2011 - Chemistry 100A Exam I Winter Quarter,...

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