Question 1

Use the diagram below to answer the following questions.  
-The solid and liquid phases can exist in equilibrium along line

Accepted Answer

A) AC. 
B) CB. 
C) CD. 
D) BD. 
A) AC. 
B) CB. 
C) CD. 
D) BD.

Question 2

The highest coordination number for spherical packing is found in the

Accepted Answer

A) body-centered cubic structure. 
B) simple cubic structure. 
C) body-centered cubic and face-centered cubic. 
D) cubic closest-packing and hexagonal closest packing. 
A) body-centered cubic structure. 
B) simple cubic structure. 
C) body-centered cubic and face-centered cubic. 
D) cubic closest-packing and hexagonal closest packing.

Question 3

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?

Accepted Answer

A) The forces of attraction between the glass and water are weaker than those in water. 
B) The forces of attraction between the glass and water are stronger than those in water. 
C) The forces of attraction between the glass and water are the same as those in water. 
D) Intermolecular forces are irrelevant to this situation. 
A) The forces of attraction between the glass and water are weaker than those in water. 
B) The forces of attraction between the glass and water are stronger than those in water. 
C) The forces of attraction between the glass and water are the same as those in water. 
D) Intermolecular forces are irrelevant to this situation.

Question 4

Identify the packing in the figure shown below.

Accepted Answer

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

Question 5

Hydroquinone is an antioxidant that is also used as a photographic reducer and developer.The normal boiling point of hydroquinone is 310°C.Calculate the pressure at which hydroquinone will boil at 200°C given that its ΔHvap is 73.38 kJ/mol.

Accepted Answer

A) 1.210 × 10-4 mm Hg 
B) 1.35 mm Hg 
C) 22.5 mm Hg 
D) 757 mm Hg 
A) 1.210 × 10-4 mm Hg 
B) 1.35 mm Hg 
C) 22.5 mm Hg 
D) 757 mm Hg

Question 6

What phase changes occur when the temperature is held constant at 140°C and the pressure is increased from 0.25 atm to 1.4 atm?

Accepted Answer

A) gas → liquid → solid 
B) gas → solid → liquid 
C) liquid → solid → gas 
D) solid → liquid → vapor 
A) gas → liquid → solid 
B) gas → solid → liquid 
C) liquid → solid → gas 
D) solid → liquid → vapor

Question 7

From the plot of vapor pressure as a function of temperature shown below,the normal boiling point for tert-butyl alcohol is approximately

Accepted Answer

A) 0°C. 
B) 40°C. 
C) 85°C. 
D) 100°C. 
A) 0°C. 
B) 40°C. 
C) 85°C. 
D) 100°C.

Question 8

Aluminum has a face-centered cubic structure and has a density of 2.70 g/cm3.What is its atomic radius?

Accepted Answer

A) 143 pm 
B) 286 pm 
C) 405 pm 
D) 1150 pm 
A) 143 pm 
B) 286 pm 
C) 405 pm 
D) 1150 pm

Question 9

The coordination number of each atom in a body-centered cubic unit cell is ________.

Accepted Answer

The answer of The coordination number of each atom in...

Question 10

While mercury is very useful in barometers,mercury vapor is toxic.Given that mercury has a ΔHvap of 59.11 kJ/mol and its normal boiling point is 356.7°C,calculate the vapor pressure in mm Hg at room temperature,25°C.

Accepted Answer

A) 2.68 × 10-3 mm Hg 
B) 2.99 mm Hg 
C) 372 mm Hg 
D) 753 mm Hg 
A) 2.68 × 10-3 mm Hg 
B) 2.99 mm Hg 
C) 372 mm Hg 
D) 753 mm Hg

Question 11

The plots below represent vapor pressure vs.temperature curves for diethyl ether,ethanol,mercury,and water,not necessarily in that order.  
-Based on the relative strengths of the intermolecular forces of attraction of each substance,which is the most likely vapor pressure vs.temperature curve for water?

Accepted Answer

A) curve (a) 
B) curve (b) 
C) curve (c) 
D) curve (d) 
A) curve (a) 
B) curve (b) 
C) curve (c) 
D) curve (d)

Question 12

Which of the following compounds forms a covalent network solid?

Accepted Answer

A) Na 
B) diamond 
C) N2 
D) CS2 
A) Na 
B) diamond 
C) N2 
D) CS2

Question 13

For which of the following phase changes is the sign of ΔS negative?

Accepted Answer

A) evaporation of water 
B) formation of raindrops from water vapor in clouds 
C) melting of ice cream 
D) sublimation of CO2 
A) evaporation of water 
B) formation of raindrops from water vapor in clouds 
C) melting of ice cream 
D) sublimation of CO2

Question 14

Which of the following forms a molecular solid?

Accepted Answer

A) lithium chloride 
B) water 
C) graphite 
D) gold 
A) lithium chloride 
B) water 
C) graphite 
D) gold

Question 15

When a substance melts at its normal melting point,the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.

Accepted Answer

A) +,- 
B) -,+ 
C) +,+ 
D) -,- 
A) +,- 
B) -,+ 
C) +,+ 
D) -,-

Question 16

The boiling point of a liquid is 64 °C and the enthalpy change for the conversion of this liquid to the gas is 32.21 kJ/mole.What is the entropy change for vaporization,ΔSvap?

Accepted Answer

A) 2061 J/mol*K 
B) 10.9 J/mol*K 
C) 503 J/mol*K 
D) 96 J/mol*K 
A) 2061 J/mol*K 
B) 10.9 J/mol*K 
C) 503 J/mol*K 
D) 96 J/mol*K

Question 17

How many unit cells share an atom that is on the face of a face-centered cubic unit cell?

Accepted Answer

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

Question 18

Which of the following compounds forms an ionic solid?

Accepted Answer

A) water 
B) carbon dioxide 
C) potassium bromide 
D) zince 
A) water 
B) carbon dioxide 
C) potassium bromide 
D) zince

Question 19

What is the physical phase of the substance at T = 225 K and P = 1.1 atm?

Accepted Answer

A) gas 
B) liquid 
C) solid 
D) supercritical fluid 
A) gas 
B) liquid 
C) solid 
D) supercritical fluid

Question 20

What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 200 pm?

Accepted Answer

A) 71 pm 
B) 566 pm 
C) 20 pm 
D) 110 pm 
A) 71 pm 
B) 566 pm 
C) 20 pm 
D) 110 pm

Exam 11: Liquids, solids, and Phase Changes

Use the diagram below to answer the following questions. -The solid and liquid phases can exist in equilibrium along line

The highest coordination number for spherical packing is found in the

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?

Identify the packing in the figure shown below.

Hydroquinone is an antioxidant that is also used as a photographic reducer and developer.The normal boiling point of hydroquinone is 310°C.Calculate the pressure at which hydroquinone will boil at 200°C given that its ΔHvap is 73.38 kJ/mol.

What phase changes occur when the temperature is held constant at 140°C and the pressure is increased from 0.25 atm to 1.4 atm?

From the plot of vapor pressure as a function of temperature shown below,the normal boiling point for tert-butyl alcohol is approximately

Aluminum has a face-centered cubic structure and has a density of 2.70 g/cm3.What is its atomic radius?

The coordination number of each atom in a body-centered cubic unit cell is ________.

While mercury is very useful in barometers,mercury vapor is toxic.Given that mercury has a ΔHvap of 59.11 kJ/mol and its normal boiling point is 356.7°C,calculate the vapor pressure in mm Hg at room temperature,25°C.

Which of the following compounds forms a covalent network solid?

For which of the following phase changes is the sign of ΔS negative?

Which of the following forms a molecular solid?

When a substance melts at its normal melting point,the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.

The boiling point of a liquid is 64 °C and the enthalpy change for the conversion of this liquid to the gas is 32.21 kJ/mole.What is the entropy change for vaporization,ΔSvap?

How many unit cells share an atom that is on the face of a face-centered cubic unit cell?

Which of the following compounds forms an ionic solid?

What is the physical phase of the substance at T = 225 K and P = 1.1 atm?

What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 200 pm?

Chemical Tools: Experimentation and Measurement

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Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

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Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Solutions and Their Properties

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Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

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Hydroquinone is an antioxidant that is also used as a photographic reducer and developer.The normal boiling point of hydroquinone is 310°C.Calculate the pressure at which hydroquinone will boil at 200°C given that its ΔH_vap is 73.38 kJ/mol.

Aluminum has a face-centered cubic structure and has a density of 2.70 g/cm³.What is its atomic radius?

While mercury is very useful in barometers,mercury vapor is toxic.Given that mercury has a ΔH_vap of 59.11 kJ/mol and its normal boiling point is 356.7°C,calculate the vapor pressure in mm Hg at room temperature,25°C.

When a substance melts at its normal melting point,the sign of ΔH is and the sign of ΔS of this phase change is .

The boiling point of a liquid is 64 °C and the enthalpy change for the conversion of this liquid to the gas is 32.21 kJ/mole.What is the entropy change for vaporization,ΔS_vap?