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Chemistry 1A - Fall 1995 - Pines - Final

Chemistry 1A - Fall 1995 - Pines - Final - Chemistry 1A...

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Chemistry 1A Final Exam Dec 11, 1995 Professor Pines (Closed Book, 3 hours, 260 points) Page 1 of 13 Name:_______________________________ Lab TA_____________________________ SID: ____________ ____________________ Discussion TA _______________________ Exam Version: A1 Identification Sticker Write your name on all 13 pages. This test consists of two parts : Multiple choice and problems requiring a longer answer. For the multiple choice section, mark one correct answer for each question AND use a #2 pencil to bubble in one correct answer on your Scantron form for each question. ° Budget your time. Anticipate spending about 90 minutes on the first part and 60 minutes on the second. ° Be sure to leave sufficient time to transfer your multiple choice answers to the Scantron form. ° The last three pages of the exam contain potentially useful formulae, tables and a blank piece of scratch paper which can be detached for your convenience. ° Good luck and have a nice break! Anticipate writing 10-15 words for each written answer. Only the first 25 words will be graded. (For Administrative Use Only) Multiple Choice Question 2 Question 1 Total
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Name Page 2 of 13 Part I: Multiple Choice, 5 points each, 150 points total MARK THE CORRECT ANSWER ON YOUR EXAM AND SHADE IN THE BUBBLE OF THE CORRECT ANSWER FOR EACH QUESTION WITH A #2 PENCIL ON YOUR SCANTRON FORM. 1.) The answer to 1 is A. Bubble in A for #1. 2.) The answer to 2 is A. Bubble in A for #2. 3.) How many atoms are there in 12.00 grams of 13 C? A) 12 B) 13 C) 5.559 x 10 23 D) 6.022 x 10 23 E) 6.524 x 10 23 4.) If the root-mean-square velocity of H 2 molecules is 1,000 meters . sec -1 then the velocity of He atoms at the same temperature is (in meters . sec -1 ) : 5.) What is the Lewis electron-dot structure of formaldehyde (CH 2 O)? O : H H C : : : H H C : :: : C : : H : O H : C : : H : O H H H O :: C : 6.) The empirical formula of a gaseous fluorocarbon is CF 2 . If 1.17 g of this compound occupies 0.174 L at STP, what is the molecular formula? 7.) Which of the following has a non-zero dipole moment? A) BF 3 B) CCl 4 C) SF 6 D) CH 2 Cl 2 E) CO 2
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Name Page 3 of 13 8.) A formic acid (HCOOH, K a = 1.77 x 10 -4 ) solution of unknown concentration required 50.0 mL 0.10 M NaOH to reach the equivalence point . What volume (mL) of 0.10 M HCl must be added to give pH = 3.75?
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