exam final 1 - Name _ Section _ TA _ Chemistry 112 FINAL...

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Name _________________________ Chemistry 112 Section ____________ FINAL EXAM Total Points = 200 TA ___________________________ Thursday, 3:20 PM May 1, 2008 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 10-digit identification number (PUID) on the answer sheet. THIS IS VERY IMPORTANT! 5. CODE your lab 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 68 multiple-choice questions worth 2.94 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 15 pages plus a Periodic Table. Please check to be sure that you have them all! Useful information: Gas constant (R) = 0.0821 L atm mol 1 K 1 STP 273 K and 1 atm (760. torr) END OF EXAM 1) Please make sure that you have entered 68 answers on your scan sheet. 2) Make sure that you have entered your name, 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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Chem 112 – Final Exam – 05/01/08 2 _____ 1. Given a fixed quantity of gas at constant temperature, calculate the new volume if the pressure was changed as follows: Initial volume = 3.00 L, initial pressure = 2.00 atm, and final pressure = 5.00 atm. (a) 0.833 L (b) 1.20 L (c) 1.20 atm (d) 3.33 L (e) 0.333 L _____ 2. What pressure is required to compress 925 L of N 2 at 1.25 atm into a container whose volume is 6.35 L? (a) 6.35 atm (b) 5.49 atm (c) 182 atm (d) 925 atm (e) 4699 atm _____ 3. Which of the following species could not act as a Brønsted-Lowry acid? (a) K 2 O (b) HCl (c) H 2 O (d) NH 4 + (e) CH 3 COOH _____ 4. If 79.0 L of He at 27.0 ° C is compressed to 32.0 L at constant pressure, what is the new temperature? (a) 10.9 ° C (b) 151 ° C (c) 741 K (d) 151 K (e) 122 ° C _____ 5. A 6.25 L sample of gas exerts a pressure of 1.46 atm at 25°C. What would the pressure of this gas sample be at 298 K if it were compressed to a volume of 5.05 L? (a) no change (1.46 atm) (b) 1.18 atm (c) 1.75 atm (d) Cannot determine without knowing the identity of the gas. (e) 1.81 atm
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Chem 112 – Final Exam – 05/01/08 3 _____ 6. Calculate the number of moles of 6.8 g NH 3 (g) and the volume it would occupy at STP. (a) 1 mole, 9.0 L (b) 0.40 moles, 22.4 L (c) 1 mole, 22.4 L (d) 0.40 moles, 9.0 L (e) none of the above _____ 7. What volume of hydrogen is required to react with 12 L of O 2 (g) at STP? Remember to balance the chemical equation. H 2 (g) + O 2 (g) H 2 O(g) (a) 24 L (b) 12 L (c) 6 L (d) 4 L (e) 36 L _____ 8. In air bags used in automobiles, the gas that fills the bags is produced from the reaction of sodium azide (NaN 3 ): NaN 3 (s) Na(s) + N 2 (g) What mass of sodium azide is needed to fill a 2.50 L air bag with N 2 at a pressure of 1.50 atm and 25 ° C?
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This note was uploaded on 04/03/2011 for the course CHEM 112 taught by Professor Harwood during the Spring '11 term at Purdue University-West Lafayette.

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exam final 1 - Name _ Section _ TA _ Chemistry 112 FINAL...

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