Fall 2006 CH101 Mock Exam 3 Ver[1]. II

Fall 2006 CH101 Mock Exam 3 Ver[1]. II - CHEM 101, Fall...

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CHEM 101, Fall 2006 Mock Exam 3 1. For the reaction: C (graphite) + O 2 (g) → CO 2 (g) ∆H 0 f =-393 kJ How many grams of C (graphite) must be burned to release 275 kJ of heat? A. 22.3 g D. 17.1 g B. 0.70 g E. 8.40 g C. 12.0 g 2. For a system undergoing a particular process, q = 20 kJ and w = 15 kJ at constant pressure. Which of the following statements is true? A. Heat flows from the system to the surroundings B. The system does work on the surroundings C. ∆E = 35 kJ D. All of the above are true 3. What is the sign of q for the following process: NaCl (s) NaCl (l) A. negative, and the process is endothermic B. positive, and the process is endothermic C. negative, and the process is exothermic D. positive, and the process is exothermic 4. Ammonium nitrate can decompose explosively when heated according to the equation: 2NH 4 NO 3 (s) 2N 2 (g) + 4 H 2 O (g) + O 2 (g) How many liters of gas would be formed at 450 0 C and 1.00 atm pressure by explosion of 450 grams of NH 4 NO 3 ? A. 208 liters C. 1450 liters B. 2340 liters D. 1167 liters 5. Which of these statements is true? I. Real gases act more like ideal gases as the temperature increases. II. When n and T are constant, a decrease in P results in a decrease in V. III. At 1 atm and 273 K, every molecule in a sample of a gas has the same speed. IV. At constant T, CO 2 molecules at 1 atm and H 2 molecules at 5 atm have the same average kinetic energy. A. D. B. E. C. 6. Which one of the following indicates the presence of weak intermolecular forces in a liquid? A. a high heat of vaporization B. a high boiling point C. a high vapor pressure D. a high viscosity 7. The molecules in a sample of solid SO 2 are attracted to each other by a combination of A. London forces and H-bonding B. H-bonding and ionic bonding C. covalent bonding and dipole-dipole interactions D. London forces and dipole-dipole interactions 8. What are all of the intermolecular forces that are
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Fall 2006 CH101 Mock Exam 3 Ver[1]. II - CHEM 101, Fall...

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