Question 1

The diagram represents the physical state of a substance. Where does this physical state occur on the heating curve?

Accepted Answer

A) AB 
B) BC 
C) CD 
D) DE 
E) EF

Question 2

Calculate the amount of heat energy, in units of kilojoules, required to evaporate 35.0 g of ethanol, CH3CH2OH, at 78.4ºC, ethanol's boiling point. (The molar heat of vaporization of liquid ethanol is 3.86 × 104 J/mol. The molar mass of ethanol is 46.07 g/mol.)

Accepted Answer

A) 29.3 kJ 
B) 1.35 × 103 kJ 
C) 1.10 × 103 kJ 
D) 8.38 × 102 kJ 
E) 9.21 × 10−4 kJ

Question 3

The molecular-level diagram shows the process of condensation.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following has the highest boiling point?

Accepted Answer

A) CH4 
B) CF4 
C) CCl4 
D) CBr4 
E) CI4

Question 5

What is the boiling point in °C of acetone at 0.8 atm?

Accepted Answer

The answer of What is the boiling point in °C...

Question 6

Which choice correctly lists the intermolecular forces present in CH4?

Accepted Answer

A) London forces only 
B) London forces and dipole-dipole forces 
C) London forces, dipole-dipole forces, and hydrogen bonding 
D) dipole-dipole forces and hydrogen bonding 
E) London forces and hydrogen bonding

Question 7

Which of the following has the strongest London dispersion forces?

Accepted Answer

A) CH4 
B) CF4 
C) CCl4 
D) CBr4 
E) CI4

Question 8

The pictured change of state occurs at constant temperature even though heat is being added. Where does this change of state occur on the cooling curve?

Accepted Answer

A) AB 
B) BC 
C) CD 
D) DE 
E) EF

Question 9

From the vapor pressure curve of propane, it can be seen that the normal boiling point of propane is about ________.

Accepted Answer

A) −137ºC 
B) −120ºC 
C) −60ºC 
D) −42ºC 
E) 0ºC

Question 10

The pictured change of state occurs at constant temperature even though heat is being removed. Where does this change of state occur on the cooling curve?

Accepted Answer

A) AB 
B) BC 
C) CD 
D) DE 
E) EF

Question 11

Calculate the amount of heat energy required to convert 55.0 g of water at 62.5ºC to steam at 124.0°C. (Cwater = 4.184 J/g°C; Csteam = 2.02 J/g°C; molar heat of vaporization of liquid water = 4.07 × 104 J/mol)

Accepted Answer

A) 2.25 × 103 kJ 
B) 1.23 × 102 kJ 
C) 0.862 kJ 
D) 1.36 × 102 kJ 
E) 2.67 kJ

Question 12

Which of the following statements regarding the liquid state is incorrect?

Accepted Answer

A) Liquid water is denser than ice (solid water). 
B) The viscosity of a liquid is related to its intermolecular forces-the stronger the forces, the higher the viscosity. 
C) As temperature increases, so will the viscosity of a liquid. 
D) Substances with strong intermolecular forces have high surface tension. 
E) Detergents interfere with the attractive forces among water molecules to lower the surface tension of the water.

Question 13

What phase transition is occurring between points D and E on the cooling curve?

Accepted Answer

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

Question 14

Rank the following substances in order of increasing intermolecular forces: Ar, H2O, N2, O2

Accepted Answer

A) Ar 2O 2 2 
B) Ar 2O 2 2 
C) H2O 2 2 2 2 2O 
E) Ar 2 2 2O

Question 15

Which of the following substances can participate in hydrogen bonding?

Accepted Answer

A) CH4 
B) CHCl3 
C) H2S 
D) NH3 
E) both H2S and NH3

Question 16

Which of the molecular-level images in the figure shows the liquid and vapor phases in equilibrium in a closed container?

Accepted Answer

A) I, II, and III 
B) none of the images 
C) I 
D) V 
E) V and VI

Question 17

Arrange the following substances in order of increasing boiling point: N2, H2, NH3, PH3

Accepted Answer

A) H2 2 3 3 
B) N2 2 3 3 
C) H2 2 3 3 
D) N2 3 3 2 
E) NH3 3 2 2

Question 18

The forces that hold Cu together in the solid state are

Accepted Answer

A) ionic bonds. 
B) dipole-dipole forces. 
C) London dispersion forces only. 
D) covalent bonds. 
E) attractions between nuclei and delocalized valence electrons.

Question 19

Which of the following statements regarding the liquid state is incorrect?

Accepted Answer

A) Liquids are about 1000 times denser than gases. 
B) Liquids are normally about 90-95% as dense as their corresponding solid. 
C) The viscosity of a liquid is a measure of its resistance to flow. 
D) Molecules with high intermolecular forces will have high surface tension. 
E) Surface tension increases as temperature increases.

Question 20

The forces that hold CaF2 together in the solid state are

Accepted Answer

A) ionic bonds. 
B) dipole-dipole forces. 
C) London dispersion forces only. 
D) covalent bonds. 
E) attractions between nuclei and delocalized valence electrons.

Exam 10: The Liquid and Solid States

The diagram represents the physical state of a substance. Where does this physical state occur on the heating curve?

Calculate the amount of heat energy, in units of kilojoules, required to evaporate 35.0 g of ethanol, CH₃CH₂OH, at 78.4ºC, ethanol's boiling point. (The molar heat of vaporization of liquid ethanol is 3.86 × 10⁴ J/mol. The molar mass of ethanol is 46.07 g/mol.)

The molecular-level diagram shows the process of condensation.

Which of the following has the highest boiling point?

What is the boiling point in °C of acetone at 0.8 atm?

Which choice correctly lists the intermolecular forces present in CH₄?

Which of the following has the strongest London dispersion forces?

The pictured change of state occurs at constant temperature even though heat is being added. Where does this change of state occur on the cooling curve?

From the vapor pressure curve of propane, it can be seen that the normal boiling point of propane is about ________.

The pictured change of state occurs at constant temperature even though heat is being removed. Where does this change of state occur on the cooling curve?

Calculate the amount of heat energy required to convert 55.0 g of water at 62.5ºC to steam at 124.0°C. (C_water = 4.184 J/g°C; C_steam = 2.02 J/g°C; molar heat of vaporization of liquid water = 4.07 × 10⁴ J/mol)

Which of the following statements regarding the liquid state is incorrect?

What phase transition is occurring between points D and E on the cooling curve?

Rank the following substances in order of increasing intermolecular forces: Ar, H₂O, N₂, O₂

Which of the following substances can participate in hydrogen bonding?

Which of the molecular-level images in the figure shows the liquid and vapor phases in equilibrium in a closed container?

Arrange the following substances in order of increasing boiling point: N₂, H₂, NH₃, PH₃

The forces that hold Cu together in the solid state are

Which of the following statements regarding the liquid state is incorrect?

The forces that hold CaF₂ together in the solid state are