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Exam 10: Liquids,solids,and Phase Changes

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Question 91

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-If figure (1) represents the vapor pressure of water,at 25°C,which figure represents the vapor pressure of mercury at 25°C?

A) figure (2)
B) figure (3)
C) figure (4)

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Question 92

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The layers of graphite are held together by

A) covalent bonds.
B) dipole-dipole forces.
C) London dispersion forces.
D) All of these

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Question 93

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Which of the following should have the largest dipole moment?

A certain mineral crystallizes in the cubic unit cell shown below. -How many cations and how many anions are in the unit cell?

What is the physical phase of the substance at T = 100 K and P = 0.1 atm?

Which drawing best represents hydrogen bonding?

A certain mineral,M_xM'_yA_z,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions. -If cation M has a 2+ charge and anion A has a 2- charge,what is the oxidation state of cation M'?

Manganese crystallizes in a body-centered cubic structure.What is the coordination number of each atom?

Ni has a face-centered unit cell.The number of Ni atoms in the unit cell is ________.

-If figure (1) represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of water at 45°C?

Helium can be liquefied when He atoms are attracted to one another by intermolecular ________ forces.

How many atoms are in one face-centered cubic unit cell of a metal?

As a liquid evaporates at a temperature below its boiling point,the temperature of the liquid

-In the drawing of acetaldehyde,CH₃CHO,the largest partial positive charge (δ+) occurs on

How many H^- ions are around each Na⁺ ion in NaH,which has a cubic unit cell with H^- ions on each corner and each face?

-In the drawing of acetic acid,CH₃CO₂H,a partial negative charge (δ-) occurs on

The phase diagram of a substance is shown below. -The approximate normal boiling point of this substance is

Identify the packing in the figure shown below.

CFC-11 (trichlorofluoromethane,CCl₃F) has been used for many years as the working fluid in refrigerators.Given its heat of vaporization is 26.88 kJ/mol and its entropy of vaporization is 90.51 J/(mol ∙ K) ,what is the boiling point of CFC-11?

When a narrow diameter glass tube is inserted into a body of water,water rises in the tube and its surface inside is concave upwards.Which statement,concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules,is accurate?