Question 1

A phase change from the gas phase directly to the solid phase is called:

Accepted Answer

A)   Sublimation
B)   Condensation
C)   Freezing
D)   Melting
E)   DepositionF) B) and E)
G) C) and D)

Question 2

What mass of water would need to evaporate from your skin in order to dissipate 1.7 * 105 J of heat from your body
H2O(l)   →\rarr→  H2O(g)   Δ\DeltaΔ Hvap = 40.7 kJ/mol

Accepted Answer

A)   58.4 g
B)   75.2 g
C)   418 g
D)   7.52 * 104 g
E)   6.92 * 106 g F) None of the above
G) C) and D)

Question 3

Potassium crystallizes in a body-centered cubic lattice. How many atoms are there per unit cell

Accepted Answer

A)   1
B)   2
C)   4
D)   6
E)   8F) All of the above
G) A) and B)

Question 4

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

Accepted Answer

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

Question 5

The normal boiling point of methanol (CH3OH)  is 64.6 ∘\circ∘ C. Given that the vapor pressure of methanol is 75.0 torr at 15.2 ∘\circ∘ C, calculate the molar enthalpy of vaporization of methanol.

Accepted Answer

A)   0.383 kJ/mol
B)   3.00 kJ/mol
C)   27.5 kJ/mol
D)   38.0 kJ/mol
E)   74.7 kJ/mol F) A) and D)
G) C) and E)

Question 6

A liquid boils when its

Accepted Answer

A)   vapor pressure is exactly 1 atmosphere.
B)   vapor pressure is equal to, or greater than, the external pressure pushing on it.
C)   temperature is equal to 273 K (standard temperature) .
D)   temperature is greater than room temperature.E) A) and B)
F) A) and C)

Question 7

Based on the phase diagram shown below, the solid phase is more dense than the liquid phase.

Accepted Answer

A) True 
 B)False

Question 8

The density of ice is less than the density of liquid water due to the formation of hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 9

Indicate all the types of intermolecular forces of attraction in C2H6(g) .

Accepted Answer

A)   Dispersion and Dipole-dipole
B)   Dipole-dipole and Ionic
C)   Ion-dipole and Hydrogen bonding
D)   Hydrogen bonding and Dispersion
E)   DispersionF) A) and D)
G) A) and E)

Question 10

Osmium tetroxide, OsO4, is a soft crystal that melts at 40 ∘\circ∘ C. The liquid does not conduct electricity. What kind of crystal is this

Accepted Answer

A)   Ionic Crystal
B)   Covalent Crystal
C)   Metallic Crystal
D)   Molecular Crystal
E)   Amorphous (Not a regular crystal)  F) B) and D)
G) D) and E)

Question 11

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

Accepted Answer

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

Question 12

Arrange the following substances in order of increasing boiling point: CH3OH, He, CH3Cl, and N2

Accepted Answer

A)   CH3OH 3Cl 2
B)   He 2 3OH 3Cl
C)   N2 3OH 3Cl
D)   He 2 3Cl 3OH
E)   CH3Cl 2 3OHF) A) and B)
G) D) and E)

Question 13

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

Accepted Answer

A)   PH3
B)   He
C)   H2S
D)   CH4
E)   CH3OHF) A) and C)
G) None of the above

Question 14

SrF2 crystallizes such that the Sr2+ ions are in a face-centered cubic arrangement and the F- ions are in the holes of the lattice (fluorite structure) . How many F- ions are present in one unit cell of this crystal

Accepted Answer

A)   1
B)   2
C)   4
D)   6
E)   8F) C) and E)
G) A) and B)

Question 15

How much energy (heat)  is required to convert 52.0 g of ice at -10.0 ∘\circ∘ C to steam at 100 ∘\circ∘ C

specific heat of ice:  2.09 J/g⋅∘CΔHfus=6.02 kJ/mol \quad 2.09 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C} \quad \Delta \mathrm{H}_{\mathrm{fus}}=6.02 \mathrm{~kJ} / \mathrm{mol} 2.09 J/g⋅∘CΔHfus​=6.02 kJ/mol  
specific heat of water:  4.18 J/g⋅∘CΔHvap=40.7 kJ/mo 4.18 \mathrm{~J} / \mathrm{g}{ \cdot}^{\circ} \mathrm{C} \quad \Delta \mathrm{H}_{\mathrm{vap}}=40.7 \mathrm{~kJ} / \mathrm{mo} 4.18 J/g⋅∘CΔHvap​=40.7 kJ/mo . 
specific heat of steam:  1.84 J/g⋅∘C 1.84 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C} 1.84 J/g⋅∘C

Accepted Answer

A)   40.2 kJ
B)   157.8 kJ
C)   1,086 kJ
D)   2,570 kJ
E)   22,957 kJ F) A) and C)
G) A) and B)

Question 16

Which one of the following substances crystallizes as a covalent crystal

Accepted Answer

A)   CaO
B)   SiO2
C)   CO2
D)   Pb
E)   KMnO4F) B) and E)
G) C) and D)

Question 17

Which of the following substances is expected to have the highest molar heat of vaporization ( Δ\DeltaΔ Hvap)

Accepted Answer

A)   Ar
B)   C6H6
C)   He
D)   NH3
E)   H2O F) A) and D)
G) C) and E)

Question 18

Which one of the following substances crystallizes as a molecular solid

Accepted Answer

A)   KI
B)   SiO2
C)   Sn
D)   CH3OH
E)   Al2(SO4) 3F) A) and C)
G) B) and D)

Question 19

The intermolecular forces present in CO include which of the following
I. dipole-dipole
II. ion-dipole
III. dispersion
IV. hydrogen bonding

Accepted Answer

A)   I, II, III, and IV
B)   I and III
C)   I, III, and IV
D)   I and II
E)   II and IVF) A) and B)
G) A) and C)

Question 20

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

A)   12.0 kJ/mol
B)   11.0 kJ/mol
C)   10.0 kJ/mol
D)   9.00 kJ/mol
E)   8.00 kJ/molF) A) and B)
G) C) and D)

Exam 11: Intermolecular Forces and Liquids and Solids

The intermolecular forces present in CO include which of the following I. dipole-dipole II. ion-dipole III. dispersion IV. hydrogen bonding

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

Correct Answer
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Based on the phase diagram shown below, the solid phase is more dense than the liquid phase.

Correct Answer
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The normal boiling point of methanol (CH₃OH) is 64.6^$\circ$C. Given that the vapor pressure of methanol is 75.0 torr at 15.2^$\circ$C, calculate the molar enthalpy of vaporization of methanol.

Correct Answer
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The density of ice is less than the density of liquid water due to the formation of hydrogen bonds.

Correct Answer
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Which of the following properties indicates the presence of strong intermolecular forces in a liquid

Correct Answer
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SrF₂ crystallizes such that the Sr²⁺ ions are in a face-centered cubic arrangement and the F^- ions are in the holes of the lattice (fluorite structure) . How many F^- ions are present in one unit cell of this crystal

Correct Answer
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A phase change from the gas phase directly to the solid phase is called:

Correct Answer
verified

Which one of the following substances crystallizes as a molecular solid

Correct Answer
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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 Answer
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What mass of water would need to evaporate from your skin in order to dissipate 1.7 * 10⁵ J of heat from your body H₂O(l) $\rarr$ H₂O(g) $\Delta$ H_vap = 40.7 kJ/mol

Correct Answer
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Potassium crystallizes in a body-centered cubic lattice. How many atoms are there per unit cell

Correct Answer
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A liquid boils when its

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

Correct Answer
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Indicate all the types of intermolecular forces of attraction in C₂H₆(g) .

Correct Answer
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Arrange the following substances in order of increasing boiling point: CH₃OH, He, CH₃Cl, and N₂

Correct Answer
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Osmium tetroxide, OsO₄, is a soft crystal that melts at 40^$\circ$C. The liquid does not conduct electricity. What kind of crystal is this

Correct Answer
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Which of the following substances is expected to have the highest molar heat of vaporization ( $\Delta$ H_vap)

Correct Answer
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Which one of the following substances crystallizes as a covalent crystal

Correct Answer
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Exam 11: Intermolecular Forces and Liquids and Solids

The intermolecular forces present in CO include which of the following I. dipole-dipole II. ion-dipole III. dispersion IV. hydrogen bonding

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Based on the phase diagram shown below, the solid phase is more dense than the liquid phase.

Correct AnswerverifiedShow Answer

The normal boiling point of methanol (CH3OH) is 64.6 ∘\circ∘ C. Given that the vapor pressure of methanol is 75.0 torr at 15.2 ∘\circ∘ C, calculate the molar enthalpy of vaporization of methanol.

Correct AnswerverifiedShow Answer

The density of ice is less than the density of liquid water due to the formation of hydrogen bonds.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

SrF2 crystallizes such that the Sr2+ ions are in a face-centered cubic arrangement and the F- ions are in the holes of the lattice (fluorite structure) . How many F- ions are present in one unit cell of this crystal

Correct AnswerverifiedShow Answer

A phase change from the gas phase directly to the solid phase is called:

Correct AnswerverifiedShow Answer

Which one of the following substances crystallizes as a molecular solid

Correct AnswerverifiedShow Answer

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

What mass of water would need to evaporate from your skin in order to dissipate 1.7 * 105 J of heat from your body H2O(l) →\rarr→ H2O(g) Δ\DeltaΔ Hvap = 40.7 kJ/mol

Correct AnswerverifiedShow Answer

Potassium crystallizes in a body-centered cubic lattice. How many atoms are there per unit cell

Correct AnswerverifiedShow Answer

A liquid boils when its

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Indicate all the types of intermolecular forces of attraction in C2H6(g) .

Correct AnswerverifiedShow Answer

Arrange the following substances in order of increasing boiling point: CH3OH, He, CH3Cl, and N2

Correct AnswerverifiedShow Answer

Osmium tetroxide, OsO4, is a soft crystal that melts at 40 ∘\circ∘ C. The liquid does not conduct electricity. What kind of crystal is this

Correct AnswerverifiedShow Answer

Which of the following substances is expected to have the highest molar heat of vaporization ( Δ\DeltaΔ Hvap)

Correct AnswerverifiedShow Answer

Which one of the following substances crystallizes as a covalent crystal

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The normal boiling point of methanol (CH₃OH) is 64.6^$\circ$C. Given that the vapor pressure of methanol is 75.0 torr at 15.2^$\circ$C, calculate the molar enthalpy of vaporization of methanol.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

SrF₂ crystallizes such that the Sr²⁺ ions are in a face-centered cubic arrangement and the F^- ions are in the holes of the lattice (fluorite structure) . How many F^- ions are present in one unit cell of this crystal

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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What mass of water would need to evaporate from your skin in order to dissipate 1.7 * 10⁵ J of heat from your body H₂O(l) $\rarr$ H₂O(g) $\Delta$ H_vap = 40.7 kJ/mol

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Indicate all the types of intermolecular forces of attraction in C₂H₆(g) .

Correct Answer
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Arrange the following substances in order of increasing boiling point: CH₃OH, He, CH₃Cl, and N₂

Correct Answer
verified

Osmium tetroxide, OsO₄, is a soft crystal that melts at 40^$\circ$C. The liquid does not conduct electricity. What kind of crystal is this

Correct Answer
verified

Which of the following substances is expected to have the highest molar heat of vaporization ( $\Delta$ H_vap)

Correct Answer
verified

Correct Answer
verified