chem1A-fa10-mt1-Stacy-soln

chem1A-fa10-mt1-Stacy-soln - Chemistry 1A Fall 2010 Midterm...

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Chemistry 1A, Fall 2010 Midterm Exam #1 September 15, 2010 (90 min, closed book) Name:___________ KEY __________________ SID:___________________________________ GSI Name:________________ x The test consists of 5 short answer questions and 18 multiple choice questions. x Put your written answers in the boxes provided. Answers outside the boxes may not be considered in grading. x Write your name on every page of the exam. Question Page Points Score Multiple Choice (1-18) 2-6 54 Anesthetics Short Answer 4 7 Mohs Short Answer 6 4 Nail Polish Short Answer 6 10 Total 75 Useful Equations and Constants: PV = nRT ± ² nRT nb V V n a P ³ ¸ ¸ ¹ · ¨ ¨ © § ´ 2 2 2 2 1 mv KE P total = P A + P B = X A P total + X B P total N 0 = 6.02214 x 10 23 mol -1 T (K) = T (°C) + 273.15 R = 0.0821 L atm K -1 mol -1 1 atm = 760 mm Hg = 760 torr § 1 bar
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Name_____________________GSI__________ Page 2 of 6 Airbags Experiment In the airbag lab, you were challenged to generate the largest gas volume in a plastic bag by reacting baking soda, NaHCO 3 , with acetic acid, CH 3 COOH. NaHCO 3 (s) + CH 3 COOH (aq) Æ CH 3 COONa (aq) + H 2 O (l) + CO 2 (g) A pair of students performed the following trials in building their airbags. Trial Moles of sodium bicarbonate, NaHCO 3 Moles of acetic acid, CH 3 COOH Moles of carbon dioxide, CO 2 A 0.012 mol 0.017 moles B 0.018 mol 0.017 moles C 0.018 mol 0.025 moles D 0.012 mol 0.025 moles 1. Which of the trials shown in the table produced the optimal GREEN airbag (minimal unreacted starting material)? A (3) B (4) C D 2. CO 2 (g) produced in the reaction of baking soda and acetic acid is collected in a 100 mL metal container. What amount of CO 2 (g) will fill the container to 5 atm at 300 K? A) 0.020 moles (2) B) 100 mL C) 0.020 grams D) 20 moles 3. A sample of CO 2 is sealed in a metal container at 300 K. The pressure inside the container is 6 atm. What is an estimate of the pressure inside the container if you cool the gas to 100 K? At this temperature, CO 2 is a solid. 4. Helium, He, and carbon dioxide, CO 2 , gases are confined in identical containers. The graph of P vs T for the gases is shown. Why is the slope for the He larger than that for CO 2 ? A) The volume of He atoms is smaller. B) The temperature of He is larger. C) The volume of the container with the CO 2 sample is smaller.
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