Question 1

From a consideration of the phase diagram below,a change from point M to point N corresponds to

Accepted Answer

A) sublimation. 
B) liquefaction. 
C) evaporation. 
D) condensation. 
E) freezing. 
A) sublimation. 
B) liquefaction. 
C) evaporation. 
D) condensation. 
E) freezing. E

Question 2

What is the maximum number of hydrogen bonds in which a water molecule could participate?

Accepted Answer

A) 2 
B) 4 
C) 3 
D) 6 
E) 5 
A) 2 
B) 4 
C) 3 
D) 6 
E) 5 B

Question 3

Knowing that ΔHvap for water is 40.7 kJ/mol,calculate Pvap of water at 37°C.

Accepted Answer

A) 52.7 torr 
B) 25.4 torr 
C) 18.7 torr 
D) 12.4 torr 
E) 6.90 torr 
A) 52.7 torr 
B) 25.4 torr 
C) 18.7 torr 
D) 12.4 torr 
E) 6.90 torr A

Question 4

Sulfur trioxide (SO3)is able to be liquefied at low temperatures due to which intermolecular force?

Accepted Answer

A) ionic bonding 
B) covalent bonding 
C) hydrogen bonding 
D) dipole-dipole 
E) London dispersion 
A) ionic bonding 
B) covalent bonding 
C) hydrogen bonding 
D) dipole-dipole 
E) London dispersion

Question 5

What is the enthalpy of vaporization of a compound that has a vapor pressure of 151 mmHg at 247 K and 1.52 mmHg at 187 K? (R = 8.31 J/(K· mol))

Accepted Answer

A) 636 kJ/mol 
B) 2 kJ/mol 
C) 4 kJ/mol 
D) 29 kJ/mol 
E) 290 kJ/mol 
A) 636 kJ/mol 
B) 2 kJ/mol 
C) 4 kJ/mol 
D) 29 kJ/mol 
E) 290 kJ/mol

Question 6

Which of the following pure substances has the lowest melting point?

Accepted Answer

A) Cs2O 
B) CsCl 
C) CsBr 
D) CsI 
E) CsF 
A) Cs2O 
B) CsCl 
C) CsBr 
D) CsI 
E) CsF

Question 7

Lithium chloride crystallizes in a face-centered cubic structure.The unit cell length is 5.14 × 10-8 cm.The chloride ions are touching each other along the face diagonal of the unit cell.The lithium ions fit into the holes between the chloride ions.What is the mass of Li Cl in a unit cell?

Accepted Answer

A) 5.63 × 10-22 g 
B) 1.41 × 10-22 g 
C) 4.22 × 10-22 g 
D) 7.04 × 10-23 g 
E) 2.82 × 10-22 g 
A) 5.63 × 10-22 g 
B) 1.41 × 10-22 g 
C) 4.22 × 10-22 g 
D) 7.04 × 10-23 g 
E) 2.82 × 10-22 g

Question 8

How many atoms are there in a body-centered cubic unit cell of rubidium?

Accepted Answer

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

Question 9

Which of the following is not a covalent network solid?

Accepted Answer

A) diamond 
B) silicon carbide 
C) quartz 
D) iron 
E) graphite 
A) diamond 
B) silicon carbide 
C) quartz 
D) iron 
E) graphite

Question 10

Which of the following pure substances has the highest melting point?

Accepted Answer

A) CCl4 
B) AlCl3 
C) NCl3 
D) LiCl 
E) MgCl2 
A) CCl4 
B) AlCl3 
C) NCl3 
D) LiCl 
E) MgCl2

Question 11

A low melting solid readily dissolves in water to give a nonconducting solution.The solid is most likely a

Accepted Answer

A) molecular solid. 
B) ionic solid. 
C) covalent network solid. 
D) weak base. 
E) metallic solid. 
A) molecular solid. 
B) ionic solid. 
C) covalent network solid. 
D) weak base. 
E) metallic solid.

Question 12

Below is a phase diagram for a substance.   Which line represents the vapor-pressure curve of the substance?

Accepted Answer

A) S-Z 
B) X-Z 
C) S-X 
D) M-N 
E) R-X 
A) S-Z 
B) X-Z 
C) S-X 
D) M-N 
E) R-X

Question 13

In which of the following substances are intermolecular forces of attraction absent?

Accepted Answer

A) HF(l) 
B) CCl4(l) 
C) NaCl(l) 
D) H2O(l) 
E) N2(l) 
A) HF(l) 
B) CCl4(l) 
C) NaCl(l) 
D) H2O(l) 
E) N2(l)

Question 14

In any cubic lattice an atom lying at the corner of a unit cell is shared equally by how many unit cells?

Accepted Answer

A) 1 
B) 16 
C) 2 
D) 4 
E) 8 
A) 1 
B) 16 
C) 2 
D) 4 
E) 8

Question 15

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

Accepted Answer

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

Question 16

A solid crystal of NaCl is

Accepted Answer

A) soft,low melting,a poor electrical conductor. 
B) soft,low melting,a good electrical conductor. 
C) hard,high melting,a good electrical conductor. 
D) hard,high melting,a poor electrical conductor. 
E) soft,high melting,a poor electrical conductor. 
A) soft,low melting,a poor electrical conductor. 
B) soft,low melting,a good electrical conductor. 
C) hard,high melting,a good electrical conductor. 
D) hard,high melting,a poor electrical conductor. 
E) soft,high melting,a poor electrical conductor.

Question 17

The boiling point of a liquid is

Accepted Answer

A) always the temperature at which the vapor pressure equals 760 mmHg (1 atm). 
B) always the temperature at which the liquid phase of a substance is in equilibrium with the vapor phase. 
C) always the temperature at which the vapor pressure equals the pressure exerted on the liquid. 
D) always equal to the vapor pressure of the liquid at a given temperature. 
E) independent of the pressure exerted on the liquid. 
A) always the temperature at which the vapor pressure equals 760 mmHg (1 atm). 
B) always the temperature at which the liquid phase of a substance is in equilibrium with the vapor phase. 
C) always the temperature at which the vapor pressure equals the pressure exerted on the liquid. 
D) always equal to the vapor pressure of the liquid at a given temperature. 
E) independent of the pressure exerted on the liquid.

Question 18

What is the name for the following phase change?
I2(l)→ I2(g)

Accepted Answer

A) vaporization 
B) freezing 
C) condensation 
D) sublimation 
E) melting 
A) vaporization 
B) freezing 
C) condensation 
D) sublimation 
E) melting

Question 19

In a certain mountain range,water boils at 94°C.What is the atmospheric pressure under these conditions? The enthalpy of vaporization of water at 100°C is 40.7 kJ/mol.(R = 8.31 J/(K · mol))

Accepted Answer

A) 1750 mmHg 
B) 324 mmHg 
C) 613 mmHg 
D) 941 mmHg 
E) 329 mmHg 
A) 1750 mmHg 
B) 324 mmHg 
C) 613 mmHg 
D) 941 mmHg 
E) 329 mmHg

Question 20

Which of the following pure substances has the highest vapor pressure at room temperature?

Accepted Answer

A) Si3H8 
B) Si2H6 
C) Si2Cl6 
D) Si4H10 
E) SiH4 
A) Si3H8 
B) Si2H6 
C) Si2Cl6 
D) Si4H10 
E) SiH4

Exam 11: States of Matter; Liquids and Solids

From a consideration of the phase diagram below,a change from point M to point N corresponds to

What is the maximum number of hydrogen bonds in which a water molecule could participate?

Knowing that ΔHvap for water is 40.7 kJ/mol,calculate Pvap of water at 37°C.

Sulfur trioxide (SO3)is able to be liquefied at low temperatures due to which intermolecular force?

What is the enthalpy of vaporization of a compound that has a vapor pressure of 151 mmHg at 247 K and 1.52 mmHg at 187 K? (R = 8.31 J/(K· mol))

Which of the following pure substances has the lowest melting point?

Lithium chloride crystallizes in a face-centered cubic structure.The unit cell length is 5.14 × 10-8 cm.The chloride ions are touching each other along the face diagonal of the unit cell.The lithium ions fit into the holes between the chloride ions.What is the mass of Li Cl in a unit cell?

How many atoms are there in a body-centered cubic unit cell of rubidium?

Which of the following is not a covalent network solid?

Which of the following pure substances has the highest melting point?

A low melting solid readily dissolves in water to give a nonconducting solution.The solid is most likely a

Below is a phase diagram for a substance. Which line represents the vapor-pressure curve of the substance?

In which of the following substances are intermolecular forces of attraction absent?

In any cubic lattice an atom lying at the corner of a unit cell is shared equally by how many unit cells?

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

A solid crystal of NaCl is

The boiling point of a liquid is

What is the name for the following phase change? I2(l)→ I2(g)

In a certain mountain range,water boils at 94°C.What is the atmospheric pressure under these conditions? The enthalpy of vaporization of water at 100°C is 40.7 kJ/mol.(R = 8.31 J/(K · mol))

Which of the following pure substances has the highest vapor pressure at room temperature?

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Quantum Theory of the Atom

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Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

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Filters

Knowing that ΔH_vap for water is 40.7 kJ/mol,calculate P_vap of water at 37°C.

Sulfur trioxide (SO₃)is able to be liquefied at low temperatures due to which intermolecular force?

Lithium chloride crystallizes in a face-centered cubic structure.The unit cell length is 5.14 × 10^-8 cm.The chloride ions are touching each other along the face diagonal of the unit cell.The lithium ions fit into the holes between the chloride ions.What is the mass of Li Cl in a unit cell?

What is the name for the following phase change? I₂(l)→ I₂(g)