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Exam 11: Intermolecular Forces and Liquids and Solids

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Question 41

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A face-centered cubic unit cell is the repeating unit in which type of crystal packing?

A) hexagonal close-packed
B) cubic close-packed
C) body centered
D) simple
E) all of the above

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Question 42

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Crystals of elemental sulfur are easily crushed, and melt at 113°C.Liquid sulfur does not conduct electricity.What kind of crystal is this?

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Question 43

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Magnesium oxide, MgO, melts at 2,800°C and is very hard.The liquid conducts electricity very well.What kind of crystal is this?

Which would have the higher boiling point CH₃Cl or CH₄?

Which property of water allows a razor blade to float on it without sinking?

Use the graph of vapor pressure to determine the normal boiling point of CHCl₃.

The number of atoms in a face-centered cubic unit cell is

The molar enthalpy of vaporization of hexane (C₆H₁₄) is 28.9 kJ/mol, and its normal boiling point is 68.73°C.What is the vapor pressure of hexane at 25°C?

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure.The edge length of this cubic unit cell is 540.9 pm.Determine the density of zincblende.

The intermolecular forces present in HSCH₂CH₂SH include which of the following? I.dipole-dipole II.ion-dipole III.dispersion IV.hydrogen bonding

Which of the following phase changes is endothermic?

The intermolecular forces present in CH₃NH₂ include which of the following? I.dipole-dipole II.ion-dipole III.dispersion IV.hydrogen bonding

The triple point of iodine is at 0.12 atm and 115°C.Thus, liquid I₂

A liquid boils when its

Calculate the amount of enthalpy required to heat 25.0 g of solid benzene (C₆H₆)at -10°C to liquid benzene at 20.0°C.Thermodynamic data for benzene: specific heat of solid benzene = 1.52 J/g·°C; specific heat of liquid benzene = 1.73 J/g·°C; melting point = 5.5°C; $\Delta$ H_fus = 9.9 kJ/mol.

Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm?

Osmium tetroxide, OsO₄, is a soft crystal that melts at 40°C.The liquid does not conduct electricity.What kind of crystal is this?

Find the temperature at which water boils on a day in the mountains when the barometric pressure is 593 mmHg.(Given: the heat of vaporization of water is 40.79 kJ/mol)

Suppose the atoms in a two-dimensional crystal have the following arrangement: On the drawing above, sketch the unit cell of this crystal.

Iron crystallizes in a body-centered cubic unit.The edge of this cell is 287 pm.Calculate the density of iron.