Rutgers University

• CHEM 01:160:162

• Student Name (Print): ___________________ RuID ___________________ The exam booklet has 19 questions for credit and one additional question to check the color of your exam booklet. Please answer all 20 questions on the OpScan sheet. There is no penalty for guessing. If you do not find the exact answer, bubble in the best choice. A proctor will check your picture ID, OpScan form, signature and calculator during the exam. The use of calculators with permanent memories (graphing calculators), cell phones, pagers, PDAs or other electronic devices other than a basic scientific calculator is expressly forbidden. The last pages of the booklet contain a periodic table along with other useful data. The use of any other notes or information on this test or taking extra time to bubble in your answers will be considered a violation of the Academic Honesty provisions of the student code. Exam scores will be posted as soon as possible. On the Opscan Form: (Use a #2 pencil or darker) 1. Sign your name across the top of the form. 2. Code the following information (blacken circles) Your Name (Last Name First) Your Ru ID Number [Start under Box A and continue to Box I] Your Exam Form Number under box P Your EXAM FORM is 1 C162s19e1v1 2 Your EXAM FORM is 1 1 Negative deviations from Raoult’s law (lower vapor pressure than predicted by Raoult’s law) are caused by: A. Increasing the pressure on the system. B. Greater repulsion between the solute and solvent than solute-solute or solvent- solvent attraction. C. The solute being non-volatile. D. The solvent being non-volatile. E. Greater attraction between the solute and solvent than solute-solute and solvent-solvent attractions. 2 The vapor pressure of pure water at 20 o C is 17.54 torr. When 50.0 g of urea, CO(NH2)2, is dissolved in 150 g of water, what is the vapor pressure of the resultant solution? Urea is a non-electrolyte. A. 15.95 torr B. 16.73 torr C. 18.48 torr D. 19.52 torr E. 15.14 torr 3 A solution is prepared by dissolving 0.30 mol of a weak acid HX in 500 g of water. This solution has a freezing point of -1.17 o C. Kf = 1.86 o C m-1 for water What is the % ionization of the weak acid