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Exam 12: Intermolecular Forces: Liquids, Solids, and Phase Changes

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Question 41

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Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.

A) C₇H₁₆, C₅H₁₂
B) CCl₄, CBr₄
C) H₂O, H₂S
D) CH₃CH₂OH, CH₃-O-CH₃
E) Xe, Kr

F) B) and C)
G) A) and D)

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Question 42

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Examine the phase diagram for the substance Bogusium (Bo) and select the correct statement.

A) Bo(s) has a lower density than Bo(l) .
B) The triple point for Bo is at a higher temperature than the melting point for Bo.
C) Bo changes from a solid to a liquid as one follows the line from C to D.
D) Bo changes from a liquid to a gas as one follows the line from C to D.
E) Point B represents the critical temperature and pressure for Bo.

F) C) and D)
G) None of the above

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Question 43

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When liquid bromine is cooled to form a solid, which of the following types of solid would it form?

The highest temperature at which superconductivity has been achieved is approximately

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

In cubic closest packing, the unit cell is body-centered cubic.

The Clausius-Clapeyron equation is used in calculations of

For the solid forms of the following elements, which one is most likely to be of the molecular type?

Which of the following should have the highest surface tension at a given temperature?

Which of the following has a boiling point which does not fit the general trend?

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases.

a. Explain what is meant by the term "unit cell". b. Copper metal has a face-centered cubic unit cell. The edge length of the unit cell is 361 pm, and the atomic weight of copper is 63.55 amu. Calculate the density of the copper in g/cm³. (1 amu = 1.661 × 10^-24 g.) c. From the data in (b), calculate the radius of a copper atom in pm.

Strontium metal crystallizes in a cubic unit cell which has an edge length of 612 pm. If the mass of an atom of Sr is 87.62 amu, and the density of Sr metal is 2.54 g/cm³, calculate the number of atoms per unit cell. (1 amu = 1.661 × 10^-24 g.)

Liquid crystal displays are most commonly constructed of smectic type liquid crystals.

Germanium is a semiconductor. With the aid of diagrams showing bands of molecular orbital, explain why it is a poor conductor and how doping it with phosphorus increases its conductivity.

Examine the following phase diagram and determine what phase exists at point F.

Crystal structures may be conveniently measured using

What adjective best describes the solid compound IF₇?

Assuming that atoms are spherical, calculate the fraction of space which is occupied by atoms (i.e., the packing efficiency) in a metal with a face-centered cubic unit cell.

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are