This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Version PREVIEW Exam 1 VANDEN BOUT (53585) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Mlib 05 3027 001 10.0 points At a certain elevated temperature and pres- sure, diamond and graphite are in equilib- rium. When graphite changes to diamond under these conditions 1. the change in standard molar Gibbs free energy is zero. 2. the change in molar Gibbs free energy is a minimum. 3. the molar Gibbs free energy for diamond is zero and so is that of graphite. 4. the change in molar Gibbs free energy is a maximum. 5. the change in molar Gibbs free energy is zero. correct Explanation: At equilibrium, G for the process is zero. Msci 14 0212 002 10.0 points Consider a series of chloride salts (MCl 2 ). As the charge-to-size ratio of M 2+ (decreases, increases) the hydration energy of M 2+ (de- creases, increases, does not change) in magni- tude and the crystal lattice energy of MCl 2 (decreases, increases, may increase or de- crease) in magnitude. 1. increases; decreases; decreases 2. decreases; increases; increases 3. increases; does not change; may increase or decrease 4. increases; increases; decreases 5. increases; increases; increases correct 6. decreases; decreases; increases 7. increases; decreases; increases Explanation: As charge-to-size ratio increases, hydration energy and crystal latice energy also increase. Sparks vp 010 003 10.0 points Consider two closed containers. Container X is a 2 L container that contains 0.5 L of acetone. Container Y is a 3 L container that contains 1.8 L of acetone. Both containers and contents are at 28 C. Which of the following is true? 1. You would need information about the shape of the containers to be able to answer this question. 2. The vapor pressure in container X is greater. 3. The vapor pressure in container Y is greater. 4. The vapor pressures in both containers are equal. correct Explanation: Msci 13 1304 004 10.0 points Consider the phase diagram for water (not to scale) Version PREVIEW Exam 1 VANDEN BOUT (53585) 2 Solid Liquid Gas A B C D 2.1 4.6 355 218 atm 0.01 374 Temperature ( C) Pressure and for carbon dioxide (not to scale) Solid Liquid Gas A B C 1 5 10 73 atm- 78- 57 31 Temperature ( C) Pressure Which of the following statements is NOT true? 1. Liquid water is more dense than ice. 2. Carbon dioxide cannot exist as a liquid at temperatures below- 57 C. 3. Water cannot exist as a liquid at- 5 C. correct 4. Water cannot exist as a liquid at pressures below 4.6 torr. 5. We could cause gaseous carbon dioxide to solidify at- 78 C by increasing the pressure to greater than 1 atm....
View Full Document
- Spring '07