Question 1

The measure of the resistance to flow of a liquid is

Accepted Answer

A) London forces. 
B) van der Waals forces. 
C) viscosity. 
D) vapor pressure. 
E) surface tension. 
A) London forces. 
B) van der Waals forces. 
C) viscosity. 
D) vapor pressure. 
E) surface tension.

Question 2

For a given pure metal which of the following cubic unit cells would result in the highest metal density?

Accepted Answer

A) It depends on the identity of the metal. 
B) The density would be identical for all these cells if the edge length of each cell were the same. 
C) A face-centered cubic cell. 
D) A simple cubic cell. 
E) A body-centered cubic cell. 
A) It depends on the identity of the metal. 
B) The density would be identical for all these cells if the edge length of each cell were the same. 
C) A face-centered cubic cell. 
D) A simple cubic cell. 
E) A body-centered cubic cell.

Question 3

A liquid has an enthalpy of vaporization of 29.1 kJ/mol.At 274 K it has a vapor pressure of 103 mmHg.What is the normal boiling point of this liquid? (R = 8.31 J/(K· mol))

Accepted Answer

A) 294 K 
B) 325 K 
C) 274 K 
D) 257 K 
E) 237 K 
A) 294 K 
B) 325 K 
C) 274 K 
D) 257 K 
E) 237 K

Question 4

Calcium crystallizes in a face-centered cubic lattice.The radius of calcium is 196 pm.What is the edge length of the unit cell?

Accepted Answer

A) 554 pm 
B) 392 pm 
C) 784 pm 
D) 415 pm 
E) 196 pm 
A) 554 pm 
B) 392 pm 
C) 784 pm 
D) 415 pm 
E) 196 pm

Question 5

Assuming the following metals all have the same unit cell structure,which of the following would be expected to have the highest density: Sc,Ti,Mn,or Co?

Accepted Answer

A) Mn 
B) Ti 
C) Co 
D) Sc 
E) cannot be determined from the information given. 
A) Mn 
B) Ti 
C) Co 
D) Sc 
E) cannot be determined from the information given.

Question 6

The vapor pressure of a given liquid will increase if

Accepted Answer

A) the liquid is moved to a container in which its surface is very much larger. 
B) the volume of the liquid is increased. 
C) the temperature is increased. 
D) the volume of the vapor phase is increased. 
E) a more volatile liquid is added to the given liquid. 
A) the liquid is moved to a container in which its surface is very much larger. 
B) the volume of the liquid is increased. 
C) the temperature is increased. 
D) the volume of the vapor phase is increased. 
E) a more volatile liquid is added to the given liquid.

Question 7

Which is the best reason for why water in a glass capillary has a concave meniscus,while mercury in a glass capillary has a convex meniscus?

Accepted Answer

A) Mercury has a greater dispersion force than water. 
B) The water is attracted more strongly to the glass than the mercury is attracted to the glass. 
C) The mercury is attracted more strongly to the glass than the water is attracted to the glass. 
D) Water is a molecular compound while mercury is a metallic element. 
E) Water has a greater dispersion force than mercury. 
A) Mercury has a greater dispersion force than water. 
B) The water is attracted more strongly to the glass than the mercury is attracted to the glass. 
C) The mercury is attracted more strongly to the glass than the water is attracted to the glass. 
D) Water is a molecular compound while mercury is a metallic element. 
E) Water has a greater dispersion force than mercury.

Question 8

A bottle is filled with a small amount of a volatile liquid and sealed.Sometime later it is observed that no liquid is evident in the sealed bottle.Which of the following statements would explain this observation?

Accepted Answer

A) More time is needed to establish equilibrium. 
B) Liquid and vapor are at equilibrium in the bottle. 
C) Too little liquid was added to achieve a liquid vapor equilibrium in the closed system. 
D) The vapor state is favored when equilibrium is established. 
E) The liquid has undergone sublimation. 
A) More time is needed to establish equilibrium. 
B) Liquid and vapor are at equilibrium in the bottle. 
C) Too little liquid was added to achieve a liquid vapor equilibrium in the closed system. 
D) The vapor state is favored when equilibrium is established. 
E) The liquid has undergone sublimation.

Question 9

If the liquid of a pure substance has a lower density than the solid,what is the effect on the pressure-temperature phase diagram?

Accepted Answer

A) The vapor-pressure curve arches upward. 
B) The normal melting point is above room temperature. 
C) The melting-point curve has a negative slope. 
D) The vapor-pressure curve arches downward. 
E) The melting-point curve has a positive slope. 
A) The vapor-pressure curve arches upward. 
B) The normal melting point is above room temperature. 
C) The melting-point curve has a negative slope. 
D) The vapor-pressure curve arches downward. 
E) The melting-point curve has a positive slope.

Question 10

Which of the following is a molecular solid?

Accepted Answer

A) carborundum,SiC 
B) quartz 
C) glass 
D) hydrogen chloride 
E) potassium 
A) carborundum,SiC 
B) quartz 
C) glass 
D) hydrogen chloride 
E) potassium

Question 11

The metal palladium crystallizes in a face-centered cubic lattice with an edge length of 388.8 pm.What is the density of palladium?​

Accepted Answer

A) ​0.751 g/cm3 
B) ​3 g/cm3 
C) ​1.5 g/cm3 
D) 6.01 ​g/cm3 
E) ​12 g/cm3 
A) ​0.751 g/cm3 
B) ​3 g/cm3 
C) ​1.5 g/cm3 
D) 6.01 ​g/cm3 
E) ​12 g/cm3

Question 12

Given the accompanying phase diagram,under what conditions will solid be found in equilibrium with either liquid or gas?

Accepted Answer

A) Anywhere along curve AB. 
B) Anywhere along curve AC. 
C) Anywhere along curve AD. 
D) Anywhere along curve AB and AD. 
E) Anywhere along curve AC and AD. 
A) Anywhere along curve AB. 
B) Anywhere along curve AC. 
C) Anywhere along curve AD. 
D) Anywhere along curve AB and AD. 
E) Anywhere along curve AC and AD.

Question 13

How much heat is released at constant pressure if a 15.0-L tank containing 47.0 atm of hydrogen sulfide gas condenses at its boiling point of -60.0oC? The enthalpy of vaporization of hydrogen sulfide is 18.7 kJ/mol at -60.0oC.(R = 0.0821 L • atm/(K • mol))

Accepted Answer

A) 1.31 × 102 J 
B) 2.68 × 106 J 
C) 4.64× 102 J 
D) 1.87× 104 J 
E) 7.54 × 105 J 
A) 1.31 × 102 J 
B) 2.68 × 106 J 
C) 4.64× 102 J 
D) 1.87× 104 J 
E) 7.54 × 105 J

Question 14

Which one of the following decreases as the strength of the attractive intermolecular forces increases?

Accepted Answer

A) The normal boiling temperature. 
B) The vapor pressure of a liquid. 
C) The extent of deviations from the ideal gas law. 
D) The heat of vaporization. 
E) The sublimation temperature of a solid. 
A) The normal boiling temperature. 
B) The vapor pressure of a liquid. 
C) The extent of deviations from the ideal gas law. 
D) The heat of vaporization. 
E) The sublimation temperature of a solid.

Question 15

A particular compound has an enthalpy of vaporization of 28400 J/mol.At 274 K it has a vapor pressure of 122 mmHg.What is its vapor pressure at 311 K? (R = 8.31 J/(K· mol))

Accepted Answer

A) 117 mmHg 
B) 262 mmHg 
C) 27.6 mmHg 
D) 538 mmHg 
E) 126 mmHg 
A) 117 mmHg 
B) 262 mmHg 
C) 27.6 mmHg 
D) 538 mmHg 
E) 126 mmHg

Question 16

In which of the following processes will energy be evolved as heat?

Accepted Answer

A) crystallization 
B) melting 
C) sublimation 
D) vaporization 
E) none of these 
A) crystallization 
B) melting 
C) sublimation 
D) vaporization 
E) none of these

Question 17

Which of the following statements concerning the accompanying phase diagram is false?

Accepted Answer

A) The solid is more dense than the liquid. 
B) Point C is the critical point of the substance. 
C) Point A is the triple point of the substance. 
D) The normal boiling point is above the triple point. 
E) The curve AD divides the solid region from the gas region. 
A) The solid is more dense than the liquid. 
B) Point C is the critical point of the substance. 
C) Point A is the triple point of the substance. 
D) The normal boiling point is above the triple point. 
E) The curve AD divides the solid region from the gas region.

Question 18

For a particular liquid,raising its temperature from 339 K to 365 K causes its vapor pressure to double.What is the enthalpy of vaporization of this liquid? (R = 8.31 J/(K · mol))

Accepted Answer

A) 27 kJ/mol 
B) 221 kJ/mol 
C) 3 kJ/mol 
D) 307 kJ/mol 
E) 149 kJ/mol 
A) 27 kJ/mol 
B) 221 kJ/mol 
C) 3 kJ/mol 
D) 307 kJ/mol 
E) 149 kJ/mol

Question 19

How many atoms are there in a cubic close-packed unit cell of platinum?

Accepted Answer

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

Question 20

Below is a phase diagram for a substance.   What is the name for point Z on the diagram?

Accepted Answer

A) normal boiling point. 
B) critical point. 
C) melting point. 
D) boiling point. 
E) triple point. 
A) normal boiling point. 
B) critical point. 
C) melting point. 
D) boiling point. 
E) triple point.

Exam 11: States of Matter; Liquids and Solids

The measure of the resistance to flow of a liquid is

For a given pure metal which of the following cubic unit cells would result in the highest metal density?

A liquid has an enthalpy of vaporization of 29.1 kJ/mol.At 274 K it has a vapor pressure of 103 mmHg.What is the normal boiling point of this liquid? (R = 8.31 J/(K· mol))

Calcium crystallizes in a face-centered cubic lattice.The radius of calcium is 196 pm.What is the edge length of the unit cell?

Assuming the following metals all have the same unit cell structure,which of the following would be expected to have the highest density: Sc,Ti,Mn,or Co?

The vapor pressure of a given liquid will increase if

Which is the best reason for why water in a glass capillary has a concave meniscus,while mercury in a glass capillary has a convex meniscus?

A bottle is filled with a small amount of a volatile liquid and sealed.Sometime later it is observed that no liquid is evident in the sealed bottle.Which of the following statements would explain this observation?

If the liquid of a pure substance has a lower density than the solid,what is the effect on the pressure-temperature phase diagram?

Which of the following is a molecular solid?

The metal palladium crystallizes in a face-centered cubic lattice with an edge length of 388.8 pm.What is the density of palladium?​

Given the accompanying phase diagram,under what conditions will solid be found in equilibrium with either liquid or gas?

How much heat is released at constant pressure if a 15.0-L tank containing 47.0 atm of hydrogen sulfide gas condenses at its boiling point of -60.0oC? The enthalpy of vaporization of hydrogen sulfide is 18.7 kJ/mol at -60.0oC.(R = 0.0821 L • atm/(K • mol))

Which one of the following decreases as the strength of the attractive intermolecular forces increases?

A particular compound has an enthalpy of vaporization of 28400 J/mol.At 274 K it has a vapor pressure of 122 mmHg.What is its vapor pressure at 311 K? (R = 8.31 J/(K· mol))

In which of the following processes will energy be evolved as heat?

Which of the following statements concerning the accompanying phase diagram is false?

For a particular liquid,raising its temperature from 339 K to 365 K causes its vapor pressure to double.What is the enthalpy of vaporization of this liquid? (R = 8.31 J/(K · mol))

How many atoms are there in a cubic close-packed unit cell of platinum?

Below is a phase diagram for a substance. What is the name for point Z on the diagram?

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The metal palladium crystallizes in a face-centered cubic lattice with an edge length of 388.8 pm.What is the density of palladium?

How much heat is released at constant pressure if a 15.0-L tank containing 47.0 atm of hydrogen sulfide gas condenses at its boiling point of -60.0^oC? The enthalpy of vaporization of hydrogen sulfide is 18.7 kJ/mol at -60.0^oC.(R = 0.0821 L • atm/(K • mol))