Question 1

The density of ice is less than the density of liquid water due to the formation of hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 2

The number of atoms in a body-centered cubic unit cell is

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 8 
A) 1 
B) 2 
C) 3 
D) 4 
E) 8

Question 3

Butter melts over a range of temperatures, rather than with a sharp melting point.Butter is classified as a/an

Accepted Answer

A) metallic crystal. 
B) covalent solid. 
C) molecular crystal. 
D) amorphous solid. 
E) ionic crystal. 
A) metallic crystal. 
B) covalent solid. 
C) molecular crystal. 
D) amorphous solid. 
E) ionic crystal.

Question 4

Which of the following liquids would have the lowest viscosity at 25°C?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 5

The molar heats of sublimation and fusion of iodine are 62.3 kJ/mol and15.3 kJ/mol, respectively.Calculate the molar heat of vaporization of liquid iodine.

Accepted Answer

A) -77.6 kJ/mol 
B) -47.0 kJ/mol 
C) 4.07 kJ/mol 
D) 47.0 kJ/mol 
E) 77.6 kJ/mol 
A) -77.6 kJ/mol 
B) -47.0 kJ/mol 
C) 4.07 kJ/mol 
D) 47.0 kJ/mol 
E) 77.6 kJ/mol

Question 6

The meniscus for water is curved upward at the edges (i.e., it is "concave up").Explain this phenomenon in terms of cohesion and adhesion.

Accepted Answer

Adhesion of water to

Question 7

What phase exists at the point labeled a?

Accepted Answer

The answer of What phase exists at the point labeled...

Question 8

Which of the following liquids would have the highest viscosity at 25°C?

Accepted Answer

A) CH3OCH3 
B) CH2Cl2 
C) C2H5OH 
D) CH3Br 
E) HOCH2CH2OH 
A) CH3OCH3 
B) CH2Cl2 
C) C2H5OH 
D) CH3Br 
E) HOCH2CH2OH

Question 9

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3.What is the radius of the platinum atom?

Accepted Answer

A) 69 pm 
B) 98 pm 
C) 139 pm 
D) 196 pm 
E) 277 pm 
A) 69 pm 
B) 98 pm 
C) 139 pm 
D) 196 pm 
E) 277 pm

Question 10

In the following picture, each arrow represents a molecule or atom.Based on the arrangement in the solid state as shown, which of the following best represents the unit cell?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 11

Which would be expected to have the higher boiling point CH4 or CH3OH?

Accepted Answer

Question 12

Which would have the higher boiling point NH3 or CH4?

Accepted Answer

Question 13

The normal boiling point of methanol (CH3OH)is 64.6°C.Given that the vapor pressure of methanol is 75.0 torr at 15.2°C, calculate the molar enthalpy of vaporization of methanol.

Accepted Answer

A) 0.383 kJ/mol 
B) 3.00 kJ/mol 
C) 27.5 kJ/mol 
D) 38.0 kJ/mol 
E) 74.7 kJ/mol 
A) 0.383 kJ/mol 
B) 3.00 kJ/mol 
C) 27.5 kJ/mol 
D) 38.0 kJ/mol 
E) 74.7 kJ/mol

Question 14

A phase change from the gas phase directly to the solid phase is called:

Accepted Answer

A) Sublimation 
B) Condensation 
C) Freezing 
D) Melting 
E) Deposition 
A) Sublimation 
B) Condensation 
C) Freezing 
D) Melting 
E) Deposition

Question 15

Ethanol (C2H5 - OH)will have a greater viscosity than ethylene glycol (HO - CH2CH2 - OH)at the same temperature.

Accepted Answer

A) True 
 B)False

Question 16

Which type of intermolecular force is the strongest? (ionic, ion-dipole, dipole-dipole, hydrogen bonding, dispersion)

Accepted Answer

The answer of Which type of intermolecular force is the...

Question 17

Which is expected to have a higher vapor pressure, CH3CH2CH2CH2CH3 or C(CH3)4?

Accepted Answer

Question 18

Which would be expected to be more viscous C5H12 or C5H10(OH)2?

Accepted Answer

Question 19

Solid iodine has a vapor pressure of 1.0 mmHg at 39°C.How many moles of iodine will sublime into a 500.mL flask at this temperature? If the volume of the flask is doubled at constant temperature, what will happen to the equilibrium vapor pressure of I2? (Assume some solid I2 is always present in the container.)

Accepted Answer

A) 2.1 × 10-4 mol; vapor pressure increases 
B) 2.0 × 10-2 mol; vapor pressure increases 
C) 2.6 × 10-5 mol; no change in vapor pressure 
D) 2.1 × 10-4 mol; no change in vapor pressure 
E) 2.6 × 10-5 mol; vapor pressure decreases 
A) 2.1 × 10-4 mol; vapor pressure increases 
B) 2.0 × 10-2 mol; vapor pressure increases 
C) 2.6 × 10-5 mol; no change in vapor pressure 
D) 2.1 × 10-4 mol; no change in vapor pressure 
E) 2.6 × 10-5 mol; vapor pressure decreases

Question 20

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C.What is the vapor pressure of CS2 at 0°C?

Accepted Answer

A) 4160 torr 
B) 447 torr 
C) 313 torr 
D) 139 torr 
E) 5.47 torr 
A) 4160 torr 
B) 447 torr 
C) 313 torr 
D) 139 torr 
E) 5.47 torr

Exam 11: Intermolecular Forces and Liquids and Solids

The density of ice is less than the density of liquid water due to the formation of hydrogen bonds.

The number of atoms in a body-centered cubic unit cell is

Butter melts over a range of temperatures, rather than with a sharp melting point.Butter is classified as a/an

Which of the following liquids would have the lowest viscosity at 25°C?

The molar heats of sublimation and fusion of iodine are 62.3 kJ/mol and15.3 kJ/mol, respectively.Calculate the molar heat of vaporization of liquid iodine.

The meniscus for water is curved upward at the edges (i.e., it is "concave up").Explain this phenomenon in terms of cohesion and adhesion.

What phase exists at the point labeled a?

Which of the following liquids would have the highest viscosity at 25°C?

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3.What is the radius of the platinum atom?

In the following picture, each arrow represents a molecule or atom.Based on the arrangement in the solid state as shown, which of the following best represents the unit cell?

Which would be expected to have the higher boiling point CH4 or CH3OH?

Which would have the higher boiling point NH3 or CH4?

The normal boiling point of methanol (CH3OH)is 64.6°C.Given that the vapor pressure of methanol is 75.0 torr at 15.2°C, calculate the molar enthalpy of vaporization of methanol.

A phase change from the gas phase directly to the solid phase is called:

Ethanol (C2H5 - OH)will have a greater viscosity than ethylene glycol (HO - CH2CH2 - OH)at the same temperature.

Which type of intermolecular force is the strongest? (ionic, ion-dipole, dipole-dipole, hydrogen bonding, dispersion)

Which is expected to have a higher vapor pressure, CH3CH2CH2CH2CH3 or C(CH3)4?

Which would be expected to be more viscous C5H12 or C5H10(OH)2?

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C.What is the vapor pressure of CS2 at 0°C?

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

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Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³.What is the radius of the platinum atom?

Which would be expected to have the higher boiling point CH₄ or CH₃OH?

Which would have the higher boiling point NH₃ or CH₄?

The normal boiling point of methanol (CH₃OH)is 64.6°C.Given that the vapor pressure of methanol is 75.0 torr at 15.2°C, calculate the molar enthalpy of vaporization of methanol.

Ethanol (C₂H₅ - OH)will have a greater viscosity than ethylene glycol (HO - CH₂CH₂ - OH)at the same temperature.

Which is expected to have a higher vapor pressure, CH₃CH₂CH₂CH₂CH₃ or C(CH₃)₄?

Which would be expected to be more viscous C₅H₁₂ or C₅H₁₀(OH)₂?

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C.What is the vapor pressure of CS₂ at 0°C?