Question 1

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

Accepted Answer

A)  Kr
B)  Br2
C)  S8
D)  Ca
E)  KF) C) and D)
G) B) and E)

Question 2

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

Accepted Answer

Question 3

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 4

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)  CH3NH2F) C) and E)
G) B) and E)

Question 5

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 6

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 7

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 8

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 9

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/cm3F) None of the above
G) B) and C)

Question 10

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/molF) C) and D)
G) B) and D)

Question 11

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

Accepted Answer

A)  CH3Cl
B)  C2H6
C)  F2
D)  H2
E)  CO2F) C) and D)
G) C) and E)

Question 12

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

Accepted Answer

Question 13

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

Accepted Answer

A)  S
B)  O
C)  F
D)  NE) All of the above
F) A) and B)

Question 14

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.F) A) and C)
G) B) and E)

Question 15

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 kJF) A) and C)
G) A) and B)

Question 16

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 17

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°CE) None of the above
F) B) and D)

Question 18

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.E) None of the above
F) A) and B)

Question 19

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 20

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

Accepted Answer

A) True 
 B)False

Exam 11: Intermolecular Forces and Liquids and Solids

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?

Correct AnswerverifiedShow Answer

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

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

Correct Answerverifiedone (each corner of ...View AnswerShow Answer

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

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

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

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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.

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

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

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

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

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

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

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

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

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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.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedAdhesion of water to...View AnswerShow Answer

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

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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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct Answer
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one (each corner of ...
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The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

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

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

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Adhesion of water to...
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