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Exam 11: Liquids, solids, and Phase Changes

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Question 1

Multiple Choice

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Which of the following compounds has the highest boiling point?

A) H₂O
B) HCl
C) N₂
D) Ar

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A

Question 2

Multiple Choice

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Which type of spherical packing has the most unused space?

A) body-centered cubic
B) cubic closest-packed
C) cubic closest-packed and hexagonal closest-packed
D) simple cubic

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Question 3

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How much heat is released when 95.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol,the enthalpy of fusion for water is 6.01 kJ/mol,the molar heat capacity of liquid water is 75.4 J/(mol ∙ °C) ,and the molar heat capacity of ice is 36.4 J/(mol ∙ °C) .

Consider a compound that undergoes sublimation at 125°C and a pressure of one atm.Which of the following could be a heating curve appropriate for heating the compound from 100°C to 150°C?

First-order diffraction of X-rays with d = 154.2 pm at an angle of 32.5° is caused by layers of atoms in a crystalline solid with a spacing of ________ pm.

A crystalline solid of unknown origin forms an aqueous solution that conducts an electrical current.The solid has a high melting point and shatters when struck with a hammer.The solid is likely to be

Which of the following forms an ionic solid?

The magnitude of the heats of vaporization,fusion and sublimation of a substance reflect the

-If figure (1) represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of ethanol,CH₃CH₂OH at 25°C?

Use the diagram below to answer the following questions. -Melting occurs along the

The two most efficiently packed unit cells have the hexagonal closest-packed and the ________ the atomic arrangements.

Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

The temperature and pressure at which all three phases can coexist in equilibrium is

A compound having A ions on each corner and B ions on each face of a cubic unit cell has the empirical formula ________.

Cubic closest-packing

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

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

The phase change H₂(g)→ H₂(s)is called ________,and the enthalpy change,ΔH,for this phase change has a ________ sign.

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

Of C₂H₅OH and C₃H₅(OH)₃ the one expected to have the higher viscosity is ________,and the one expected to have the higher surface tension is ________.