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chapter12q

# chapter12q - Chapter 12 Intermolecular Forces Liquids...

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Chapter 12 Intermolecular Forces Liquids Solids and Phase Changes 1. Pentane, C 5 H 12 , boils at 35°C. Which of the following is true about kinetic energy, E k , and potential energy, E p , when liquid pentane at 35°C is compared with pentane vapor at 35°C? A. E k ( g ) < E k ( l ); E p ( g ) E p ( l ) B. E k ( g ) > E k ( l ); E p ( g ) E p ( l ) C. E p ( g ) < E p ( l ); E k ( g ) E k ( l ) D. E p ( g ) > E p ( l ); E k ( g ) E k ( l ) E. E p ( g ) E p ( l ); E k ( g ) E k ( l ) 5. The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true? A. Solid xenon has a higher density than liquid xenon. B. Solid xenon has the same density as liquid xenon. C. The phase diagram cannot be used to predict which phase of xenon is denser. D. Freezing xenon is an endothermic process. E. None of these statements is true. 9. Liquid sodium can be used as a heat transfer fluid. Its vapor pressure is 40.0 torr at 633°C and 400.0 torr at 823°C. Calculate its heat of vaporization. A. 43.4 kJ/mol B. 52.5 kJ/mol C. 70.6 kJ/mol D. 1.00 × 10 2 kJ/mol E. none of these choices is correct 13. Consider the following phase diagram and identify the process occurring as one goes from point C to point D. A. increasing temperature with a phase change from solid to liquid B. increasing temperature with a phase change from solid to vapor C. increasing temperature with a phase change from liquid to vapor D.

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