final_exam_sample

final_exam_sample - CHEMISTRY 15 FINAL EXAM-Version A...

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CHEMISTRY 15 FINAL EXAM-Version A (White) Dr. M. Richards-Babb June 29, 2001 An optical scoring machine will grade this examination. The machine is not programmed to accept the correct one of two sensed answers and will not sense answers which are lightly marked. Mark your answer sheet carefully with a No. 2 soft lead pencil and erase any undesired marks COMPLETELY . Avoid making any extraneous marks on the answer sheet other than the information asked below. On the answer sheet: 1. Print your name in the space for NAME (Last name first, CIRCLE your last name) . 2. In the space marked SUBJECT write Chem 15. 3. In the space marked TEST NO . write FE. 4. In the space marked DATE write Summer 2001. 5. In the space marked HOUR write Babb . 6. Check to see that you have 50 examination questions, periodic table, scratch paper and a scantron with NO mark in the upper right hand corner. HAND IN ONLY THE ANSWER SHEET. Useful Conversions N A = 6.0220×10 23 R = 0.08206 L-atm/mol-K 1 mol = 22.4 L 1 atm = 760 mm Hg = 760 torr c p (H 2 O (L) )=4.18 J/g-C 1 lb = 453.59 g
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CHEM 15 FINAL EXAM (Version A, White) CHOOSE THE ONE BEST ANSWER Summer I ’ 2001 1. What mass of MgO can be formed by the reaction of 73.0 g Mg with excess Mg(NO 3 ) 2 ? 8 Mg(s) + Mg(NO 3 ) 2 (s) — > Mg 3 N 2 (s) + 6 MgO(s) A. 90.8 g B. 726 g C. 53.8 g D. 7.98 g E. 121 g 2. How many molecules of SO 2 present in 21 g SO 2 ? A. 5.2×10 -25 molecules B. 1.3×10 25 molecules C. 0.98 molecules D. 1.8×10 24 molecules E. 2.0×10 23 molecules 3. Which of the following contains the MOST atoms ? A. 5 molecules N 2 O 5 B. 7 molecules NO C. 3 mole NO D. 2 mole N 2 O 5 E. Both B and D. 4. Consider the reaction shown below, C 2 H 4 + 3 O 2 — > 2 CO 2 + 2 H 2 O What mass of CO 2 can be obtained by the reaction of 14. g C 2 H 4 with 24. g O 2 ? (Molar masses: C 2 H 4 =28.05; CO 2 =44.01) A. 45 g B. 33 g C. 9.0 g D. 22 g E. 110 g 5. Mark the same answer as for the preceding question. This means that the preceding question is worth double.
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6. A 2.691 g sample of a compound containing C and H was decomposed and found to contain 2.224 g C. The empirical formula of this compound is: A. C 5 H 12 B. C 2 H 5 C. CH 3 D. C 2 H 3 E. C 3 H 7 7. During a titration, 13.77 mL of 0.20 M NaOH was needed to titrate 25.0 mL of H 2 SO 4 solution. What was the concentration of the H 2 SO 4 solution? (HINT: Write a balanced equation first.) A. 0.22 M B. 0.015 M C. 0.055 M D. 2.9 M E. 0.15 M 8. Write a net ionic equation for the aqueous reaction taking place in the last question. The spectator ions are: A. H + and OH - B. Na + only C. OH - and SO 4 -2 D. Na + and SO 4 -2 E. All ions are spectators. No net ionic equation can be written. 9.
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This note was uploaded on 04/26/2008 for the course CHEM 115 taught by Professor Chigwada during the Spring '07 term at WVU.

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final_exam_sample - CHEMISTRY 15 FINAL EXAM-Version A...

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