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Exam 11: Intermolecular Forces and Liquids and Solids

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Question 41

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A liquid boils when its

A) vapor pressure is exactly 1 atmosphere.
B) vapor pressure is equal to, or greater than, the external pressure pushing on it.
C) temperature is equal to 273 K (standard temperature) .
D) temperature is greater than room temperature.

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Question 42

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

A) viscosity
B) surface tension
C) density
D) specific heat
E) triple point

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Question 43

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The intermolecular forces present in CH₃NH₂ 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 number of atoms in a face-centered cubic unit cell is

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

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

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

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

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

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)

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?

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

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

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

Which would have the higher boiling point CH₃Cl or CH₄?

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.

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

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