topic10 - X. Liquids, Solids, and Intermolecular...

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Liquids, Solids, and Intermolecular Attractions Use the following answers to answer questions 1 and 3. (A) A network solid with covalent bonding (B) A molecular solid with zero dipole moment (C) A molecular solid with hydrogen bonding (D) an ionic solid (E) A metallic solid 1. Solid ethyl alcohol, C 2 H 5 OH Answer: C 2. Silicon Dioxide, SiO 2 Answer: A 3. The following is a list of hydrogen halides and their boiling points: (HF, 19), (HCl, -85), (HBr, -67), (HI, -35). The relatively high boiling point of HF can be correctly explained by which of the following? (A) HF gas is more ideal (B) HF is the strongest acid (C) HF molecules have a smaller dipole moment (D) HF is much less soluble in water (D) HF molecules tend to form hydrogen bonds Answer: E 4. The critical temperature of a substance is: (A) temperature at which the vapor pressure of the liquid is equal to the external pressure (B) temperature at which the vapor pressure of the liquid is equal the760 mm Hg (C) temperature at which the solid, liquid, and vapor phases are in equilibrium (D) temperature at which liquid and vapor phases are in equilibrium at 1 atm (E) lowest temperature above which a substance cannot be liquefied at any applied pressure Answer: E 5. Which of the following statements is always true about the phase diagram of any one-component system? (A) the slope of the curve representing equilibrium between the vapor and liquid phase is negative (B) the slope of the curve representing equilibrium between liquid and solid phases is negative (C) The slope of the curve representing equilibrium between the liquid and solid phases is positive (D) The temperature at the triple point is greater than the normal freezing point (E) The pressure at the triple point is greater than 1 atm. Answer: A
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topic10 - X. Liquids, Solids, and Intermolecular...

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