Question 1

For the following phase diagram the area labeled IV is

Accepted Answer

A)  gas 
B)  liquid 
C)  solid 
D)  super critical fluid 
E)  supercooled liquid 
A)  gas 
B)  liquid 
C)  solid 
D)  super critical fluid 
E)  supercooled liquid C

Question 2

Which of the following is the most polarizable?

Accepted Answer

A)  He 
B)  Xe 
C)  Ar 
D)  Kr 
E)  Ne 
A)  He 
B)  Xe 
C)  Ar 
D)  Kr 
E)  Ne B

Question 3

The process of a gas converting directly to a solid is

Accepted Answer

A)  evaporation 
B)  condensation 
C)  sublimation 
D)  deposition 
E)  freezing 
A)  evaporation 
B)  condensation 
C)  sublimation 
D)  deposition 
E)  freezing D

Question 4

While many solids are crystalline with a well ordered structure of molecules, glasses are amorphous solids in which the structure of the molecules is random. How is a glass different from a liquid?

Accepted Answer

A)  The glass will have a lower diffusion coefficient. 
B)  The glass will be rigid. 
C)  The glass will be more compressible. 
D)  a & b 
E)  all of the above 
A)  The glass will have a lower diffusion coefficient. 
B)  The glass will be rigid. 
C)  The glass will be more compressible. 
D)  a & b 
E)  all of the above

Question 5

Given the phase diagram below, at 200K and a pressure of 150 atm. What phase(s) is (are) present?

Accepted Answer

A)  gas 
B)  liquid 
C)  solid 
D)  liquid and solid 
E)  gas and liquid 
A)  gas 
B)  liquid 
C)  solid 
D)  liquid and solid 
E)  gas and liquid

Question 6

The density of a gas is typically

Accepted Answer

A)  1000 times smaller than a liquid. 
B)  10 times smaller than a liquid. 
C)  approximately the same as a liquid. 
D)  10 times greater than a liquid. 
E)  1000 times greater than a liquid. 
A)  1000 times smaller than a liquid. 
B)  10 times smaller than a liquid. 
C)  approximately the same as a liquid. 
D)  10 times greater than a liquid. 
E)  1000 times greater than a liquid.

Question 7

The vapor pressure of methanol (CH3OH) at 25°C is 93.3 Torr. If 1 g of methanol is placed into an evacuated 10 L container at a constant temperature of 25°C, what is the final pressure in the container?

Accepted Answer

A)  58.1 Torr 
B)  93.3 Torr 
C)  376 Torr 
D)  1 atm 
E)  none of the above 
A)  58.1 Torr 
B)  93.3 Torr 
C)  376 Torr 
D)  1 atm 
E)  none of the above

Question 8

For a given substance, the vapor pressure of a liquid can never be

Accepted Answer

A)  equal to the pressure at the triple point. 
B)  equal to the critical temperature. 
C)  lower than the vapor pressure of the solid. 
D)  higher than the vapor pressure of the solid. 
E)  greater than 1 atm. 
A)  equal to the pressure at the triple point. 
B)  equal to the critical temperature. 
C)  lower than the vapor pressure of the solid. 
D)  higher than the vapor pressure of the solid. 
E)  greater than 1 atm.

Question 9

The potential energy of a molecule at the surface of a liquid is

Accepted Answer

A)  higher than that of a molecule in the bulk. 
B)  lower than that of a molecule in the bulk. 
C)  exactly the same as that of a molecule in the bulk. 
D)  higher or lower depending on the liquid. 
E)  higher or lower depending on the pressure. 
A)  higher than that of a molecule in the bulk. 
B)  lower than that of a molecule in the bulk. 
C)  exactly the same as that of a molecule in the bulk. 
D)  higher or lower depending on the liquid. 
E)  higher or lower depending on the pressure.

Question 10

The critical temperature for cyclohexane is 553.5 K and the critical pressure is 40.7 bar. A sample of cyclohexane at a temperature of 532 K and a pressure of 40.7 is

Accepted Answer

A)  a gas 
B)  a liquid 
C)  a super critical fluid 
D)  a super heated fluid 
E)  a super heated vapor 
A)  a gas 
B)  a liquid 
C)  a super critical fluid 
D)  a super heated fluid 
E)  a super heated vapor

Question 11

The critical temperature for methanol is 512.6 K and the critical pressure is 81 bar. If a sample starts at a temperature of 590 K and a pressure of 45.3 bar and is cooled at constant pressure to a temperature of 512.6 K, what if any, phase transition are observed?

Accepted Answer

A)  condensation 
B)  evaporation 
C)  condensation followed by evaporation 
D)  there are no phase transitions 
A)  condensation 
B)  evaporation 
C)  condensation followed by evaporation 
D)  there are no phase transitions

Question 12

Rank the following in order of increasing boiling point.
CHCl3, Ne, H2O, MgO

Accepted Answer

A)  CHCl3, Ne, H2O, MgO 
B)  MgO, Ne, H2O, CHCl3 
C)  Ne, H2O, MgO, CHCl3 
D)  Ne, CHCl3, H2O, MgO 
E)  MgO, CHCl3, H2O, Ne 
A)  CHCl3, Ne, H2O, MgO 
B)  MgO, Ne, H2O, CHCl3 
C)  Ne, H2O, MgO, CHCl3 
D)  Ne, CHCl3, H2O, MgO 
E)  MgO, CHCl3, H2O, Ne

Question 13

Based on intermolecular forces, which organic compound should have the highest boiling point?

Accepted Answer

A)  Propane 
B)  Dimethyl ketone (acetone) 
C)  Ethanol 
D)  Propanol 
E)  Hexane 
A)  Propane 
B)  Dimethyl ketone (acetone) 
C)  Ethanol 
D)  Propanol 
E)  Hexane

Question 14

Which of the following is true for a liquid at its equilibrium vapor pressure?

Accepted Answer

A)  the rate of evaporation exceeds that of condensation. 
B)  the rate of condensation exceeds that of evaporation. 
C)  the rate of condensation and evaporation are the same. 
D)  the system is neither evaporating nor condensing. 
E)  the system is at the critical point. 
A)  the rate of evaporation exceeds that of condensation. 
B)  the rate of condensation exceeds that of evaporation. 
C)  the rate of condensation and evaporation are the same. 
D)  the system is neither evaporating nor condensing. 
E)  the system is at the critical point.

Question 15

The vapor pressure of methanol (CH3OH) at 25°C is 93.3 Torr. If 10 g of methanol is placed into an evacuated 10 L container at a constant temperature of 25°C, what is the final pressure in the container?

Accepted Answer

A)  58.1 Torr 
B)  93.3 Torr 
C)  376 Torr 
D)  1 atm 
E)  none of the above 
A)  58.1 Torr 
B)  93.3 Torr 
C)  376 Torr 
D)  1 atm 
E)  none of the above

Question 16

At 20°C the vapor pressure of dry ice is 56.5 atm. If 100 g of dry ice is place in an evacuated 0.5 L chamber at a constant temperature of 20°C, how many grams of solid will sublime?

Accepted Answer

A)  0.0872 g 
B)  10.1 g 
C)  28.1 g 
D)  51.7 g 
E)  100 g 
A)  0.0872 g 
B)  10.1 g 
C)  28.1 g 
D)  51.7 g 
E)  100 g

Question 17

The thermal expansion coefficient of most liquids is

Accepted Answer

A)  larger than that for most solids. 
B)  larger than that for most gases. 
C)  smaller than that for most solids. 
D)  smaller than that for most gases. 
E)  b & c
F) a & d 
A)  larger than that for most solids. 
B)  larger than that for most gases. 
C)  smaller than that for most solids. 
D)  smaller than that for most gases. 
E)  b & c
F) a & d

Question 18

The boiling point of CCl4 is slightly higher than that of CHCl3. The boiling point of CHF3 is significantly higher than CF4. Why is this?

Accepted Answer

A)  The dipole of CHF3 is larger than that of CHCl3. 
B)  The dipole of CHF3 is smaller than that of CHCl3. 
C)  The dispersion forces are larger in CF4 than CCl4. 
D)  The dispersion forces are larger in CF4 than CCl4 
E)  b & c
F) a & d 
A)  The dipole of CHF3 is larger than that of CHCl3. 
B)  The dipole of CHF3 is smaller than that of CHCl3. 
C)  The dispersion forces are larger in CF4 than CCl4. 
D)  The dispersion forces are larger in CF4 than CCl4 
E)  b & c
F) a & d

Question 19

A liquid kinetically trapped below its freezing temperature is called a

Accepted Answer

A)  glassy liquid. 
B)  condensed liquid. 
C)  fluid liquid. 
D)  supercooled liquid. 
E)  frozen liquid. 
A)  glassy liquid. 
B)  condensed liquid. 
C)  fluid liquid. 
D)  supercooled liquid. 
E)  frozen liquid.

Question 20

Arrange the follow in order of increasing boiling point: H2O, H2S, H2Se, H2Te

Accepted Answer

A)  H2O, H2S, H2Se, H2Te 
B)  H2Te, H2Se, H2S, H2O 
C)  H2O, H2Te, H2Se, H2S 
D)  H2S, H2Se, H2Te, H2O 
E)  H2S, H2Se, H2O, H2Te 
A)  H2O, H2S, H2Se, H2Te 
B)  H2Te, H2Se, H2S, H2O 
C)  H2O, H2Te, H2Se, H2S 
D)  H2S, H2Se, H2Te, H2O 
E)  H2S, H2Se, H2O, H2Te

Exam 10: Solids, Liquids, and Phase Transitions

For the following phase diagram the area labeled IV is

Which of the following is the most polarizable?

The process of a gas converting directly to a solid is

While many solids are crystalline with a well ordered structure of molecules, glasses are amorphous solids in which the structure of the molecules is random. How is a glass different from a liquid?

Given the phase diagram below, at 200K and a pressure of 150 atm. What phase(s) is (are) present?

The density of a gas is typically

The vapor pressure of methanol (CH3OH) at 25°C is 93.3 Torr. If 1 g of methanol is placed into an evacuated 10 L container at a constant temperature of 25°C, what is the final pressure in the container?

For a given substance, the vapor pressure of a liquid can never be

The potential energy of a molecule at the surface of a liquid is

The critical temperature for cyclohexane is 553.5 K and the critical pressure is 40.7 bar. A sample of cyclohexane at a temperature of 532 K and a pressure of 40.7 is

The critical temperature for methanol is 512.6 K and the critical pressure is 81 bar. If a sample starts at a temperature of 590 K and a pressure of 45.3 bar and is cooled at constant pressure to a temperature of 512.6 K, what if any, phase transition are observed?

Rank the following in order of increasing boiling point. CHCl3, Ne, H2O, MgO

Based on intermolecular forces, which organic compound should have the highest boiling point?

Which of the following is true for a liquid at its equilibrium vapor pressure?

The vapor pressure of methanol (CH3OH) at 25°C is 93.3 Torr. If 10 g of methanol is placed into an evacuated 10 L container at a constant temperature of 25°C, what is the final pressure in the container?

At 20°C the vapor pressure of dry ice is 56.5 atm. If 100 g of dry ice is place in an evacuated 0.5 L chamber at a constant temperature of 20°C, how many grams of solid will sublime?

The thermal expansion coefficient of most liquids is

The boiling point of CCl4 is slightly higher than that of CHCl3. The boiling point of CHF3 is significantly higher than CF4. Why is this?

A liquid kinetically trapped below its freezing temperature is called a

Arrange the follow in order of increasing boiling point: H2O, H2S, H2Se, H2Te

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

Binding in Transition Metal Compounds and Coordination Complexes

The Gaseous State

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

The vapor pressure of methanol (CH₃OH) at 25°C is 93.3 Torr. If 1 g of methanol is placed into an evacuated 10 L container at a constant temperature of 25°C, what is the final pressure in the container?

Rank the following in order of increasing boiling point. CHCl₃, Ne, H₂O, MgO

The vapor pressure of methanol (CH₃OH) at 25°C is 93.3 Torr. If 10 g of methanol is placed into an evacuated 10 L container at a constant temperature of 25°C, what is the final pressure in the container?

The boiling point of CCl₄ is slightly higher than that of CHCl₃. The boiling point of CHF₃ is significantly higher than CF₄. Why is this?

Arrange the follow in order of increasing boiling point: H₂O, H₂S, H₂Se, H₂Te