Question 1

The freezing point of a liquid does not change as the atmospheric pressure changes.

Accepted Answer

A) True 
 B)False

Question 2

The shape of the water-to-glass meniscus results from the strong adhesive forces between glass and water.

Accepted Answer

A) True 
 B)False

Question 3

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Accepted Answer

A) SiH4 
B) H2 
C) H2S 
D) CH4 
E) CH3NH2 
A) SiH4 
B) H2 
C) H2S 
D) CH4 
E) CH3NH2

Question 4

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 5

The specific heat of liquid ethanol, C2H5OH(l), is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Accepted Answer

A) 42.7 kJ 
B) 49.5 kJ 
C) 179 kJ 
D) 1970kJ 
E) 6840 kJ 
A) 42.7 kJ 
B) 49.5 kJ 
C) 179 kJ 
D) 1970kJ 
E) 6840 kJ

Question 6

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?

Accepted Answer

A) 5.96 g/cm3 
B) 2.98 g/cm3 
C) 2.98 * 10-6 g/cm3 
D) 5.96 * 10-30 g/cm3 
E) 11.9 g/cm3 
A) 5.96 g/cm3 
B) 2.98 g/cm3 
C) 2.98 * 10-6 g/cm3 
D) 5.96 * 10-30 g/cm3 
E) 11.9 g/cm3

Question 7

Which of the following atoms does not participate in hydrogen bonding?

Accepted Answer

A) S 
B) O 
C) F 
D) N 
A) S 
B) O 
C) F 
D) N

Question 8

Which one of the following elements would have the lowest melting point?

Accepted Answer

A) Kr 
B) Br2 
C) S8 
D) Ca 
E) K 
A) Kr 
B) Br2 
C) S8 
D) Ca 
E) K

Question 9

Indicate all the types of intermolecular forces of attraction in CF4(g).

Accepted Answer

Question 10

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I2

Accepted Answer

A) is more dense than I2 (s). 
B) cannot exist above 115°C. 
C) is liquid at room temperature. 
D) cannot have a vapor pressure less than 91 torr. 
A) is more dense than I2 (s). 
B) cannot exist above 115°C. 
C) is liquid at room temperature. 
D) cannot have a vapor pressure less than 91 torr.

Question 11

Suppose the atoms in a two-dimensional crystal have the following arrangement:   How many atoms are in one unit cell?

Accepted Answer

one (each corner of

Question 12

Which of the following would be expected to have the highest vapor pressure at room temperature?

Accepted Answer

A) ethanol, bp = 78°C 
B) methanol, bp = 65°C 
C) water, bp = 100°C 
D) acetone, bp = 56°C 
A) ethanol, bp = 78°C 
B) methanol, bp = 65°C 
C) water, bp = 100°C 
D) acetone, bp = 56°C

Question 13

Crystals of elemental sulfur are easily crushed, and melt at 113°C.Liquid sulfur does not conduct electricity.What kind of crystal is this?

Accepted Answer

The answer of Crystals of elemental sulfur are easily crushed,...

Question 14

Which of the following substances would have the highest critical temperature?

Accepted Answer

A) CH3Cl 
B) C2H6 
C) F2 
D) H2 
E) CO2 
A) CH3Cl 
B) C2H6 
C) F2 
D) H2 
E) CO2

Question 15

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

Question 16

Which of the following properties indicates the presence of weak intermolecular forces in a liquid?

Accepted Answer

A) a high heat of vaporization 
B) a high critical temperature 
C) a high vapor pressure 
D) a high boiling point 
E) None of the above. 
A) a high heat of vaporization 
B) a high critical temperature 
C) a high vapor pressure 
D) a high boiling point 
E) None of the above.

Question 17

Identify the dominant (strongest)type of intermolecular force present in RbCl(s).

Accepted Answer

The answer of Identify the dominant (strongest)type of intermolecular force...

Question 18

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol.Estimate the value for the heat of sublimation.

Accepted Answer

The answer of Methane has a heat of fusion of...

Question 19

Given the following compound and its boiling point, identify whether it is polar or nonpolar: Ar, -185.7°C.

Accepted Answer

The answer of Given the following compound and its boiling...

Question 20

Of the given pair of compounds, which would have the higher boiling point?
NH3 or CH4

Accepted Answer

Exam 11: Intermolecular Forces and Liquids and Solids

The freezing point of a liquid does not change as the atmospheric pressure changes.

The shape of the water-to-glass meniscus results from the strong adhesive forces between glass and water.

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

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.

The specific heat of liquid ethanol, C2H5OH(l), is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?

Which of the following atoms does not participate in hydrogen bonding?

Which one of the following elements would have the lowest melting point?

Indicate all the types of intermolecular forces of attraction in CF4(g).

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I2

Suppose the atoms in a two-dimensional crystal have the following arrangement: How many atoms are in one unit cell?

Which of the following would be expected to have the highest vapor pressure at room temperature?

Crystals of elemental sulfur are easily crushed, and melt at 113°C.Liquid sulfur does not conduct electricity.What kind of crystal is this?

Which of the following substances would have the highest critical temperature?

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.

Which of the following properties indicates the presence of weak intermolecular forces in a liquid?

Identify the dominant (strongest)type of intermolecular force present in RbCl(s).

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol.Estimate the value for the heat of sublimation.

Given the following compound and its boiling point, identify whether it is polar or nonpolar: Ar, -185.7°C.

Of the given pair of compounds, which would have the higher boiling point? NH3 or CH4

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

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

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

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The specific heat of liquid ethanol, C₂H₅OH(l), is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Indicate all the types of intermolecular forces of attraction in CF₄(g).

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

Of the given pair of compounds, which would have the higher boiling point? NH₃ or CH₄