exam 1 chem 112

exam 1 chem 112 - ., . Chemistry 112 fly (gig/mpepé \ ,...

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Unformatted text preview: ., . Chemistry 112 fly (gig/mpepé \ , Name Section EXAM I Total Points = 125 r , . 1 , TA Wednesday, 7:00 PM \JK (mum- Cal/ti? January 30, 2008 XMrfl/{Cd 5%" ’42:”) AWL . 5547.22 arm/(Ll: Directions: " , .. ’ ,6/t/ww (ma 1 fare; 1. Each student is responsible for following directions. Read this page carefully. flfl‘w’fi " 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 IO-digit identification number (PUID) on the answer sheet. THIS IS VERY IMPORTANT! 5. CODE your section number on the answer sheet. Please use all fo_ur_ 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 21 multiple-choice questions worth 5.95 points each. Choose the 9% best or correct answer for each question and write it both on your exam paper w on the computer answer sheet. The computer answer sheet is the only one that will be graded! 8. This exam consists of 5 pages plus a Periodic Table. Please check to be sure that you have them all! END OF EXAM 1) Please make sure that you have entered 21 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! Chem 1 12 w Exam 1 — 01/30/08 1. A bicycle tire is inflated to a totai pressure of 125 psi. What is the pressure in mm Hg? [1 atm a 760 mm Hg = 14.7 psi] (a) 165 (b) 8,500 (c) 8.50 (d) 6.46 (e) 6.46 x 103 The following are all properties of gases except: (a) Gas particles do not have strong attraction forces. (b) The kinetic energy of a gas does NOT depend on temperature. (c) Collisions of gas particles are elastic. (d) Gases have no definite shape or volume. (e) Gas particles are separated by a lot of Space. The absolute temperature scale has the following units: (a) Kelvin (K) (b) Celsius (°C) (c) Fahrenheit (°F) (d) Pascal (Pa) (6) (EU-(C) The intramolecular attraction forces in sodium nitrate (N aN03) are best described as: (a) Ionic (b) Dipoie (C) Hydrogen bonding. (d) Dispersion forces (e) None of the above A cylinder equipped with a movable piston has applied pressure of 4.0 atm and a volume of 6000 mL. What is the volume of the cylinder if the applied pressure is decreased to 760 mm H g? (a) 24 L (b) 240 mL (0) 32 mL (d) 32 L (e) Cannot be determined A 25.0 g sample of dry ice (C02(s}) was allowed to warm up to room temperature. What volume will be occupied by the C02 gas at 20°C and 1 atm? [Molar masses: C = 12.01 and c = 16.00 g mol—l; R = 0.0821 L atm mol‘1K“] (a) 21.5 L (b) 13.7 L (c) 13.7 mL (d) 0.93 L (e) 601. L Chem l 12 — Exam I — 7/2/03 3 7. Calculate the volume occupied by 0.845 mol oil]; gas at a pressure of 1.37 atm and a temperature of 420°C; R = 0.0821 L atin moi" K—1 (a) 1.60 L (b) 160 L (c) 16.0 L (d) 160 mL (e) 16 mL 8. Ethanol (CH3CH20H) boils at 79 °C and 1 atm of pressure, while ethanethiol (CH3CHQSH) boils at 35°C at the same pressure. The difference between the two boiling points is due to: (a) larger size of sulfur than oxygen. (‘0) hydrogen bonding in ethanol. (0) dispersion forces in ethanol. ((1) sulfur being more electronegative than oxygen. (e) higher specific heat capacity of ethanol. 9. Which of the following temperatures cannot be reached? (a) -100°C (b) 2 K (c) “290°C (d) 200°C (8) -50°F 10. A plot of the pressure of a gas versus its temperature (°C) yields a: (a) linear relationship with no intercept. (b) linear relationship with a negative y—intercept. (c) quadratic relationship with a positive y—intercept at 0°C. (d) no relationship whatsoever. (e) linear relationship with a negative x-intercept at —273.15°C. ll. A sample of gas has a mass of 0.311 g. Its volume is 0225 L at a temperature of55°C and a pressure of 886 mm Hg. What is the gas’s molar mass? R = 0.0821 L atm rnol—l K—1 and 1 atm = 760 mm Hg (a) 28.6 g mol—1 (b) 40.7 g incl—1 (0) 31.9 g 11101"1 (a) 2.00 g mol“‘ (e) None of the above 12. The gas described in question #11 above is: (a) 02 (b) Air (0) N2 (d) He (6) H2 Chem 1 l2 - Exam 1— 7/2/03 13. 14. 15. 16. 17. A mixture of He, Ne, and Ar has a total pressure of 558 mm Hg. If the partial pressure of He is 341 mm Hg and the partial pressure of Ne is 112 mm Hg, what is the partial pressure of Ar? (a) 1011 mm Hg (b) 778 mm Hg (0) 329 mm Hg ((1) 105 mm Hg (e) 105 atm The following are all allotropes of carbon except: (a) diamond. (1)) Steel. (c) Graphite. (d) fullerenes (e) (a) - (d) are all allotropes of carbon. How much energy is released as 50.0 g of water in the form of steam at 100°C is converted to water at 100°C? [Molar heat of vaporization for water = 40.7 k] moi—l. Molar masses: H 21.01 and O :160 g molmil (a) 113 id (10) 113 J (c) 2035 Id (a) 11.3 k} (e) 907 kJ How many liters of oxygen gas form when 294 g of KClO3 completely decompose in the following reaction, which is used in the ignition of fireworks? KCIOg(s) —> KCI(S) + 02(g) Assume that the oxygen gas is collected at a pressure of 755 mm Hg and temperature of 32°C. [1 atm a 760 mm Hg]. Hint: remember to balance the reaction. R = 0.0821 L atm mol"1 Km]; Molar Mass of KClO3 = 122.55 g mol—1 (a) 40.3 L (b) 60.5 L (c) 90.7 L (d) 10.2 L (e) 1700 L A liquid boils at 82°C at sea level. At an elevation of4000 m, the liquid’s boiling point would: (a) increase. (1)) decrease. (0) remain unchanged. (d) become difficult to measure. (e) vary depending on the outside temperature. Chem 1 12 — Exam I — 7/2/03 18. The gas over a rapidly boiling pot of water is sampled and analyzed. Which of the following gases do you expect to compose a large fraction of the gas sample? (2:) H20 (13) 02 (C) H2 (‘31) 03 (e) Cannot predict without knowing the location of boiling water. 19. Calculate the amount of water in grams that can be vaporized at its boiling point (100°C) with 155 kJ of heat. [AHvap (at 100°C) = 40.7 kJ mol‘1 (molar heat of vaporizationfl. (a) 3.6 kg (1)) 350.5 g (c) 3-8 g (d) 6.86 g (e) 68.6 g 20. Which of the following compounds is an ionic solid? (8) H20(S) (ice) (b) (30(3) (c) Steel (d) CaClg (3) C32 21. Which of the following compounds is a molecular solid? (a) H20(S) (ice) (b) Co(s) (c) 032(3) ((1) CaCIz (6) (a) and (C) THE END! OHM u; 5cm}? 1/. ‘c, /.2. n fly) ...
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This note was uploaded on 02/27/2012 for the course CHEM 112 taught by Professor Harwood during the Spring '11 term at Purdue.

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exam 1 chem 112 - ., . Chemistry 112 fly (gig/mpepé \ ,...

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