1 292 K 2 315 K 3 216 K 4 107 K 5 136 K correct Explanation Follow the 1 atm

1 292 k 2 315 k 3 216 k 4 107 k 5 136 k correct

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1. 292 K 2. 315 K 3. 216 K 4. 107 K 5. 136 K correct Explanation: Follow the 1 atm line horizontally to the solid/liquid line and read from the tempera- ture scale 136 K. 023 (part 2 of 3) 10 points In the previous phase diagram, the three zones that are depicted as I, II, and III are which of the following? 1. I-liquid; II-gas; III-solid 2. I-vapor; II-solution; III-blend 3. I-solid; II-liquid; III-gas 4. I-gas; II-solid; III-plasma 5. I-liquid; II-solid; III-gas correct Explanation: Zone II is solid, zone III is gas, and zone I is liquid. 024 (part 3 of 3) 10 points Referring to the same phase diagram, the sub- stance is heated from 100 K to 300 K at a pressure of 50 atm. Which of the following happens to the substance? 1. sublimation 2. deposition 3. vaporization 4. fusion and sublimation 5. condensation 6. fusion 7. sublimation and vaporization 8. condensation and vaporization 9. solidification 10. melting and vaporization correct Explanation: The solid/liquid line is crossed, so melting occurs. Then the liquid/gas line is crossed, so vaporization occurs. 025 (part 1 of 1) 10 points Which of the following statements about col- ligative properties of aqueous solutions is FALSE? 1. The higher the concentration of solute in the solution, the higher the vapor pressure of the solvent. correct 2. Osmosis is a colligative property. 3. Colligative properties only depend on the number of solute particles present in solu- tion. 4. For a given solution, the freezing point will be lowered more than the boiling point will be raised.
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Yoon, Seong Meen – Exam 1 – Due: Sep 18 2007, 3:00 pm – Inst: James Holcombe 9 Explanation: Colligative properties, which include osmo- sis, vapor pressure lowering, melting and boil- ing point elevations, depend only on the num- ber of solute particles present in solution, not on their properties. The effect on the melting point of a given solution is less than the effect on its boiling point. With a higher concentration of non-volatile solute the concentration of the solvent in the solution is lower, causing the vapor pressure of the solution to be lower. 026 (part 1 of 1) 10 points Henry’s Law would allow one to predict 1. the extent of dissociation of solute in solution. 2. elevation in boiling point with the addi- tion of a non-volatile solute. 3. the new pressure of a gas if only the volume of the vessel containing the gas were changed. 4. the vapor pressure of the solvent above the pure solvent. 5. the solubility of a gas in a liquid given the pressure of gas above the solution. correct Explanation: Henry’s law states that the pressure of a gas above the surface of a solution is proportional to the concentration of gas dissolved in the solution. 027 (part 1 of 1) 10 points In discussions of global warming, CO 2 and H 2 O are considered “greenhouse gases” be- cause 1. together they make up a major portion ( > 50%) of the atmosphere above the planet.
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