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Exam 11: Intermolecular Forces and Liquids and Solids

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Question 21

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Butter melts over a range of temperature, rather than with a sharp melting point. Butter is classified as a/an

A) metallic crystal.
B) covalent solid.
C) molecular crystal.
D) amorphous solid.
E) ionic crystal.

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Question 22

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Potassium crystallizes in a body-centered cubic lattice.How many atoms are there per unit cell?

A) 1
B) 2
C) 4
D) 6
E) 8

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Question 23

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Indicate all the types of intermolecular forces of attraction in CH₂O(g).

Given that the heat of vaporization of mercury is 59.0 kJ/mol and the vapor pressure of mercury is 0.0017 torr at 25°C, calculate the normal boiling point of mercury.

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Which of the following liquids would have the lowest viscosity at 25°C?

Which one of the following substances crystallizes as a covalent crystal?

Helium atoms do not combine to form He₂ molecules, yet He atoms do attract one another weakly through

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of the platinum atom?

Use the following data to determine the molar heat of vaporization of chlorine.

Which is expected to have a higher boiling point, C₅H₁₂ or C(CH₃)₄?

Of the given pair of compounds, which would have the higher boiling point? CH₃Cl or CH₄

The structural form of the element Ge closely resembles the structure of

Which one of the following crystallizes in a metallic lattice?

Copper crystallizes in a face-centered cubic unit cell. The density of copper is 8.94 g/cm³.Calculate the length of the edge of the unit cell in pm.

Each of the following substances is a liquid at -50°C. Place these liquids in order of increasing vapor pressure: dimethyl ether (CH₃OCH₃) , propane (C₃H₈) , and ethanol (CH₃CH₂OH) _.

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

Calculate the amount of heat that must be absorbed by 10.0 g of ice at -20°C to convert it to liquid water at 60.0°C. Given: specific heat (ice) = 2.1 J/g·°C; specific heat (water) = 4.18 J/g·°C; $\Delta$ H_fus = 6.0 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.

How much energy (heat) is required to convert 52.0 g of ice at -10.0°C to steam at 100°C?