Question 1

What is the dominant intermolecular force in HF(l)?

Accepted Answer

A)  Dispersion forces 
B)  Hydrogen bonding 
C)  Ionic bonding 
D)  Dipole forces 
E)  Induced dipole forces 
A)  Dispersion forces 
B)  Hydrogen bonding 
C)  Ionic bonding 
D)  Dipole forces 
E)  Induced dipole forces

Question 2

What type of solid is conductive when melted but not as a solid?

Accepted Answer

A)  Metallic 
B)  Ionic 
C)  Molecular 
D)  Crystalline 
E)  Covalent 
A)  Metallic 
B)  Ionic 
C)  Molecular 
D)  Crystalline 
E)  Covalent

Question 3

Rhodium (atomic mass 102.9 g/mol)crystallizes in a face-centered cubic unit cell.In addition,rhodium has an atomic radius of 135 pm.What is the density (in g/cm3)of rhodium?

Accepted Answer

A)  1.53 g/cm3 
B)  6.14 g/cm3 
C)  17.4 g/cm3 
D)  12.3 g/cm3 
E)  27.8 g/cm3 
A)  1.53 g/cm3 
B)  6.14 g/cm3 
C)  17.4 g/cm3 
D)  12.3 g/cm3 
E)  27.8 g/cm3

Question 4

In the phase diagram below,which phase is most dense?

Accepted Answer

A)  solid 
B)  liquid 
C)  gas 
D)  supercritical fluid 
E)  none of the above 
A)  solid 
B)  liquid 
C)  gas 
D)  supercritical fluid 
E)  none of the above

Question 5

Which of the following equations is a correct form of the Clausius-Clapeyron equation?

Accepted Answer

A)  $\ln \frac{P_{2}}{P_{1}}=-\frac{R}{\Delta H_{\mathrm{vap}}}\left[\frac{1}{T_{2}}-\frac{1}{T_{1}}\right]$ 
B)  $\ln \frac{P_{2}}{P_{1}}=-\frac{\Delta H_{\text {vap }}}{R}\left[\frac{1}{T_{2}}-\frac{1}{T_{1}}\right]$ 
C)  $\ln \frac{P_{2}}{P_{1}}=-\Delta H_{\text {vap }}\left[\frac{1}{T_{2}-T_{1}}\right]$ 
D)  $\ln \frac{P_{2}}{P_{1}}=\frac{\Delta H_{\text {vap }}}{R}\left[\frac{1}{T_{2}-T_{1}}\right]$ 
E)  $\ln \frac{P_{2}}{P_{1}}=-\frac{\Delta H_{\text {vap }}}{R}\left[\frac{1}{T_{2}-T_{1}}\right]$ 
A)  $\ln \frac{P_{2}}{P_{1}}=-\frac{R}{\Delta H_{\mathrm{vap}}}\left[\frac{1}{T_{2}}-\frac{1}{T_{1}}\right]$ 
B)  $\ln \frac{P_{2}}{P_{1}}=-\frac{\Delta H_{\text {vap }}}{R}\left[\frac{1}{T_{2}}-\frac{1}{T_{1}}\right]$ 
C)  $\ln \frac{P_{2}}{P_{1}}=-\Delta H_{\text {vap }}\left[\frac{1}{T_{2}-T_{1}}\right]$ 
D)  $\ln \frac{P_{2}}{P_{1}}=\frac{\Delta H_{\text {vap }}}{R}\left[\frac{1}{T_{2}-T_{1}}\right]$ 
E)  $\ln \frac{P_{2}}{P_{1}}=-\frac{\Delta H_{\text {vap }}}{R}\left[\frac{1}{T_{2}-T_{1}}\right]$

Question 6

Which one of the following molecules has the lowest boiling point?

Accepted Answer

A)  CH4 
B)  CHCl3 
C)  CH2Cl2 
D)  CH3Cl 
E)  CCl4 
A)  CH4 
B)  CHCl3 
C)  CH2Cl2 
D)  CH3Cl 
E)  CCl4

Question 7

Which of the following substances will exhibit dipole forces?

Accepted Answer

A)  SO3 
B)  H2S 
C)  CH4 
D)  SF6 
E)  N2 
A)  SO3 
B)  H2S 
C)  CH4 
D)  SF6 
E)  N2

Question 8

Water has an equilibrium vapor pressure of 23.8 mm Hg at 25°C.What mass of water vapor is present,at equilibrium,in a room with dimensions of 7.0 m × 8.0 m × 2.7 m? (760 mm Hg = 1 atm,R = 0.0821 L.atm/mol.K)

Accepted Answer

A)  0.0050 kg 
B)  0.029 kg 
C)  0.28 kg 
D)  3.5 kg 
E)  5.0 kg 
A)  0.0050 kg 
B)  0.029 kg 
C)  0.28 kg 
D)  3.5 kg 
E)  5.0 kg

Question 9

All of the following statements concerning dispersion forces are correct EXCEPT

Accepted Answer

A)  the strength of dispersion forces depends on the number of electrons in a molecule. 
B)  dispersion forces are the primary attractive forces in metal-metal bonding. 
C)  dispersion forces involve the attraction between induced dipoles. 
D)  dispersion forces are the primary attractive force in molecular solids consisting of nonpolar molecules. 
E)  dispersion forces exist in all molecular solids. 
A)  the strength of dispersion forces depends on the number of electrons in a molecule. 
B)  dispersion forces are the primary attractive forces in metal-metal bonding. 
C)  dispersion forces involve the attraction between induced dipoles. 
D)  dispersion forces are the primary attractive force in molecular solids consisting of nonpolar molecules. 
E)  dispersion forces exist in all molecular solids.

Question 10

Use the phase digram to answer the following questions:  
-According to the phase diagram ,which point corresponds to conditions where solid,liquid,and gas phases all exist?

Accepted Answer

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

Question 11

Arrange NH3,CH4,and PH3 in order from lowest to highest boiling points.

Accepted Answer

A)  CH4 3 3 
B)  CH4 3 3 
C)  PH3 3 4 
D)  NH3 4 3 
E)  PH3 4 3 
A)  CH4 3 3 
B)  CH4 3 3 
C)  PH3 3 4 
D)  NH3 4 3 
E)  PH3 4 3

Question 12

All of the following substances will exhibit dipole forces EXCEPT

Accepted Answer

A)  SO3. 
B)  SF2. 
C)  H2Se. 
D)  NO2. 
E)  NO. 
A)  SO3. 
B)  SF2. 
C)  H2Se. 
D)  NO2. 
E)  NO.

Question 13

What type of solid is malleable?

Accepted Answer

A)  Metallic 
B)  Ionic 
C)  Molecular 
D)  Crystalline 
E)  Covalent 
A)  Metallic 
B)  Ionic 
C)  Molecular 
D)  Crystalline 
E)  Covalent

Question 14

Which one of the following molecules will exhibit dipole forces as a pure liquid or solid?

Accepted Answer

A)  CS2 
B)  C2H2 
C)  CCl4 
D)  Br2 
E)  PH3 
A)  CS2 
B)  C2H2 
C)  CCl4 
D)  Br2 
E)  PH3

Question 15

Ethanol has a molar heat of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3°C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.31 J/K⋅mol)

Accepted Answer

A)  -83.8°C 
B)  -24.4°C 
C)  62.6°C 
D)  73.0°C 
E)  78.0°C 
A)  -83.8°C 
B)  -24.4°C 
C)  62.6°C 
D)  73.0°C 
E)  78.0°C

Question 16

Elemental phosphorus is a molecular solid consisting of P4 molecules.It melts at 44°C.What is the principal force present in P4(s)?

Accepted Answer

A)  Dipole forces 
B)  Hydrogen bonding 
C)  Dispersion forces 
D)  Metallic bonding 
E)  Ionic bonding 
A)  Dipole forces 
B)  Hydrogen bonding 
C)  Dispersion forces 
D)  Metallic bonding 
E)  Ionic bonding

Question 17

Niobium crystallizes in a body-centered cubic unit cell.If the radius of a niobium atom is 0.145 nm,what is the length of an edge of the unit cell?

Accepted Answer

A)  0.251 nm 
B)  0.290 nm 
C)  0.335 nm 
D)  0.410 nm 
E)  0.502 nm 
A)  0.251 nm 
B)  0.290 nm 
C)  0.335 nm 
D)  0.410 nm 
E)  0.502 nm

Question 18

Mount Everest rises to a height of 29,035 ft (8.850 × 103 m)above sea level.At this height,the atmospheric pressure is 230 mm Hg.At what temperature does water boil at the summit of Mount Everest? (ΔHvap for H2O = 40.7 kJ/mole,R = 8.31 J/K.mol)

Accepted Answer

A)  −17°C 
B)  31°C 
C)  48°C 
D)  57°C 
E)  69°C 
A)  −17°C 
B)  31°C 
C)  48°C 
D)  57°C 
E)  69°C

Question 19

Methyl alcohol,CH3OH,has a vapor pressure of 203 mm Hg at 35°C.If 5.00 g CH3OH is sealed in a 10.0 L flask,what mass will remain in the liquid phase when equilibrium is established at 35°C? Assume any liquid remaining in the flask has a negligible volume.(760 mm Hg = 1 atm,R = 0.0821 L⋅atm/mol⋅K)

Accepted Answer

A)  0.00 g 
B)  1.62 g 
C)  2.08 g 
D)  2.27 g 
E)  4.69 g 
A)  0.00 g 
B)  1.62 g 
C)  2.08 g 
D)  2.27 g 
E)  4.69 g

Question 20

Dorothy Crowfoot Hodgkin was famous for what?

Accepted Answer

A)  The discovery of x-rays 
B)  The invention of x-ray diffraction 
C)  The discovery of supercritical fluids 
D)  The determination of the structure of insulin 
E)  All of the above 
A)  The discovery of x-rays 
B)  The invention of x-ray diffraction 
C)  The discovery of supercritical fluids 
D)  The determination of the structure of insulin 
E)  All of the above

Exam 9: Liquids and Solids

What is the dominant intermolecular force in HF(l)?

What type of solid is conductive when melted but not as a solid?

Rhodium (atomic mass 102.9 g/mol)crystallizes in a face-centered cubic unit cell.In addition,rhodium has an atomic radius of 135 pm.What is the density (in g/cm3)of rhodium?

In the phase diagram below,which phase is most dense?

Which of the following equations is a correct form of the Clausius-Clapeyron equation?

Which one of the following molecules has the lowest boiling point?

Which of the following substances will exhibit dipole forces?

Water has an equilibrium vapor pressure of 23.8 mm Hg at 25°C.What mass of water vapor is present,at equilibrium,in a room with dimensions of 7.0 m × 8.0 m × 2.7 m? (760 mm Hg = 1 atm,R = 0.0821 L.atm/mol.K)

All of the following statements concerning dispersion forces are correct EXCEPT

Use the phase digram to answer the following questions: -According to the phase diagram ,which point corresponds to conditions where solid,liquid,and gas phases all exist?

Arrange NH3,CH4,and PH3 in order from lowest to highest boiling points.

All of the following substances will exhibit dipole forces EXCEPT

What type of solid is malleable?

Which one of the following molecules will exhibit dipole forces as a pure liquid or solid?

Ethanol has a molar heat of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3°C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.31 J/K⋅mol)

Elemental phosphorus is a molecular solid consisting of P4 molecules.It melts at 44°C.What is the principal force present in P4(s)?

Niobium crystallizes in a body-centered cubic unit cell.If the radius of a niobium atom is 0.145 nm,what is the length of an edge of the unit cell?

Mount Everest rises to a height of 29,035 ft (8.850 × 103 m)above sea level.At this height,the atmospheric pressure is 230 mm Hg.At what temperature does water boil at the summit of Mount Everest? (ΔHvap for H2O = 40.7 kJ/mole,R = 8.31 J/K.mol)

Dorothy Crowfoot Hodgkin was famous for what?

Matter and Measurements

Atoms, molecules, and Ions

Mass Relations in Chemistry;stoichiometry

Reactions in Aqueous Solution

Gases

Electronic Structure and the Periodic Table

Covalent Bonding

Thermochemistry

Solutions

Rate of Reaction

Gaseous Chemical Equilibrium

Acids and Bases

Equilibria in Acid-Base Solutions

Complex Ion and Precipitation Equilibria

Spontaneity of Reaction

Electrochemistry

Nuclear Reactions

Complex Ions

Chemistry of the Metals

Chemistry of the Nonmetals

Organic Chemistry

Organic Polymers, natural and Synthetic

Filters

Rhodium (atomic mass 102.9 g/mol)crystallizes in a face-centered cubic unit cell.In addition,rhodium has an atomic radius of 135 pm.What is the density (in g/cm³)of rhodium?

Arrange NH₃,CH₄,and PH₃ in order from lowest to highest boiling points.

Elemental phosphorus is a molecular solid consisting of P₄ molecules.It melts at 44°C.What is the principal force present in P₄(s)?

Mount Everest rises to a height of 29,035 ft (8.850 × 10³ m)above sea level.At this height,the atmospheric pressure is 230 mm Hg.At what temperature does water boil at the summit of Mount Everest? (ΔH_vap for H₂O = 40.7 kJ/mole,R = 8.31 J/K.mol)