115 Final Exam Spring 2004

115 Final Exam Spring 2004 - Name Chemistry 115 Section...

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Name _____________________________ Chemistry 115 Section ____________ FINAL EXAM Total Points = 250 Social Security # ___________________ Wednesday, 8:00 AM Instructor ________________________ May 5, 2004 Directions : 1. Each student is responsible for following directions. Read this page carefully. 2. Write your name and other requested information on this page and on the separate answer sheet. 3. CODE your name on the answer sheet using an ordinary (#2) pencil. 4. CODE your correct nine-digit identification number ( Social Security ) on the answer sheet. THIS IS VERY IMPORTANT! 5. CODE your section number on the answer sheet. Please use all four digits, 0101, 0102, 0201, etc. This is also very important! 6. Put all calculations on the examination pages. DO NOT PUT ANY EXTRA MARKS ON THE COMPUTER ANSWER SHEET! 7. This exam consists of 40 multiple-choice questions worth 6.25 points each. Choose the one best or correct answer for each question and write it both on your exam paper and on the computer answer sheet. The computer answer sheet is the only one that will be graded! 8. This exam consists of 10 pages plus a Periodic Table. Please check to be sure that you have them all! Useful Information: 0.0821 L @ atm ) mol @ K Avogadro’s number = 6.022 x 10 23 Density = mass / volume = MW x n/V END OF EXAM 1) Please make sure that you have entered 40 answers on your scan sheet. 2) Make sure that you have entered your name, (9 digit) ID number, and lab section number (4 digits). 3) You MUST turn the scan sheet in to your TA before leaving the exam!
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2 Chem 115 ! Final Exam ! 5/5/04 _A____ 1. Which of the following is not an empirical formula? (a) H 2 O 2 (b) CH 4 (c) CO 2 (d) H 2 O (e) CuSO 4 • 5H 2 O _C____ 2. The number of hydrogen atoms in 0.050 mol of C 3 H 8 O 3 is: (a) 3.0 x 10 22 (b) 1.2 x 10 23 (c) 2.4 x 10 23 (d) 4.8 x 10 23 (e) none of the above _C____ 3. In the combustion analysis of 0.300 g of glucose ( C 6 H 12 O 6 ), what mass, in grams of CO 2 would be produced? (Hint: What is the relationship between mol glucose combusted and mol CO 2 produced?) (a) 0.120 (b) 0.210 (c) 0.440 (d) 1.10 (e) 1.47 _D____ 4. What is the name of N 2 O 5 ? (a) dinitrogen oxide (b) nitrogen(II) oxide (c) nitrogen(IV) oxide (d) dinitrogen pentoxide _B____ 5. What is the mass in grams of 0.250 mol of calcium carbonate? (a) 4.00 x 10 2 g (b) 25.0 g (c) 4.00 x 10 – 2 g (d) 2.5 x 10 – 3 g _C____ 6. What is the stoichiometric coefficient that balances the CO in the following reaction. (Note: all coefficients should be integers). Ca 3 (PO 4 ) 2 + SiO 2 + C CaSiO 3 + CO + P 4 (a) 6 (b) 8 (c) 10 (d) 12 (e) 14
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3 Chem 115 ! Final Exam ! 5/5/04 _C____ 7. For the following reaction, if 80 g of methane and 128 g of O 2 gas are available, how many grams of CO 2 will be produced? CH 4 + 2 O 2 CO 2 + 2 H 2 O (a) 22 (b) 44 (c) 88 (d) 220 (e) can’t be determined _C____ 8. If 16 g of methane are combusted in excess oxygen, what is the percent yield for the reaction if 40 g of CO 2 are produced? CH 4 + 2 O 2 CO 2 + 2 H 2 O (a) 75 % (b) 80 % (c) 91 % (d) 100 % (e) 250 % _D____ 9. How many mL of a 0.550 M sodium hydroxide solution are needed to neutralize 45 mL of a 1.2 M solution of HCl?
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115 Final Exam Spring 2004 - Name Chemistry 115 Section...

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