Question 1

The vapor pressure of a liquid in a closed container depends upon

Accepted Answer

A) the amount of liquid. 
B) the surface area of the liquid. 
C) the volume of the container. 
D) the temperature. 
E) None of the above. 
A) the amount of liquid. 
B) the surface area of the liquid. 
C) the volume of the container. 
D) the temperature. 
E) None of the above.

Question 2

Which one of the following crystallizes in a metallic lattice?

Accepted Answer

A) C 
B) NaMnO4 
C) K 
D) LiClO4 
E) K2Cr2O7 
A) C 
B) NaMnO4 
C) K 
D) LiClO4 
E) K2Cr2O7

Question 3

Of the given pair of compounds, which would have the higher boiling point?
CCl4 or CH4

Accepted Answer

Question 4

Which one of the following substances is expected to have the highest boiling point?

Accepted Answer

A) Br2 
B) Cl2 
C) F2 
D) I2 
A) Br2 
B) Cl2 
C) F2 
D) I2

Question 5

Calculate the amount of heat needed to melt 2.00 kg of iron at its melting point (1,809 K), given that $\Delta$Hfus = 13.80 kJ/mol.

Accepted Answer

A) 494 kJ 
B) 27,600 kJ 
C) 27.6 kJ 
D) 27,600 J 
E) 25,000 kJ 
A) 494 kJ 
B) 27,600 kJ 
C) 27.6 kJ 
D) 27,600 J 
E) 25,000 kJ

Question 6

Which of the following liquids would have the lowest viscosity at 25°C?

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 7

Use the following data to determine the molar heat of vaporization of chlorine. T (°C)-84.5 -71.2 -47.3
P (mmHg)40.0 100.0 400.0

Accepted Answer

A) 34,700 J 
B) 21,900 J 
C) 317 J 
D) 712 J 
E) 9.99 kJ 
A) 34,700 J 
B) 21,900 J 
C) 317 J 
D) 712 J 
E) 9.99 kJ

Question 8

The molar enthalpy of vaporization of hexane (C6H14)is 28.9 kJ/mol, and its normal boiling point is 68.73°C. What is the vapor pressure of hexane at 25°C?

Accepted Answer

A) 171 torr 
B) 4.44 torr 
C) 117 torr 
D) 3370 torr 
E) 759 torr 
A) 171 torr 
B) 4.44 torr 
C) 117 torr 
D) 3370 torr 
E) 759 torr

Question 9

The number of nearest neighbors (atoms that make contact)around each atom in a face-centered cubic lattice of a metal is

Accepted Answer

A) 2. 
B) 4. 
C) 6. 
D) 8. 
E) 12. 
A) 2. 
B) 4. 
C) 6. 
D) 8. 
E) 12.

Question 10

Ethanol and dimethyl ether have the same molecular formula, C2H6O. Ethanol boils at 78.4°C. Dimethyl ether boils at -23.7°C. Their structural formulas are, respectively, CH3CH2OH and CH3OCH3. Explain why the boiling point of the ether is so much lower than the boiling point of ethanol.

Accepted Answer

Ethanol is a polar molecule th

Question 11

For which of the following species are the dispersion forces strongest?

Accepted Answer

A) C4H10 
B) C5H12 
C) C6H14 
D) C7H16 
E) C8H18 
A) C4H10 
B) C5H12 
C) C6H14 
D) C7H16 
E) C8H18

Question 12

Indicate all the types of intermolecular forces of attraction in SF6(g).

Accepted Answer

Question 13

Which one of the following substances crystallizes as a molecular solid?

Accepted Answer

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

Question 14

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 15

Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm?

Accepted Answer

A) The melting point will decrease. 
B) The melting point will remain the same. 
C) The melting point will increase. 
D) The substance will not melt at pressures of 1 atm and above; instead, the solid sublimes to form the gas phase. 
A) The melting point will decrease. 
B) The melting point will remain the same. 
C) The melting point will increase. 
D) The substance will not melt at pressures of 1 atm and above; instead, the solid sublimes to form the gas phase.

Question 16

Calculate the amount of enthalpy required to heat 25.0 g of solid benzene (C6H6)at -10°C to liquid benzene at 20.0°C. Thermodynamic data for benzene: specific heat of solid benzene = 1.52 J/g·°C; specific heat of liquid benzene = 1.73 J/g·°C; melting point = 5.5°C; $\Delta$Hfus = 9.9 kJ/mol.

Accepted Answer

The answer of Calculate the amount of enthalpy required to...

Question 17

Which of the following substances should have the lowest boiling point?

Accepted Answer

A) CBr4 
B) CBr3F 
C) CBr2F2 
D) CBrF3 
E) CF4 
A) CBr4 
B) CBr3F 
C) CBr2F2 
D) CBrF3 
E) CF4

Question 18

Boron nitride, BN3, melts at approximately at 3,000°C under high pressure. This material is almost as hard as diamond. What kind of crystal is this?

Accepted Answer

Question 19

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) CH3OH 
A) PH3 
B) He 
C) H2S 
D) CH4 
E) CH3OH

Question 20

Arrange the following in order of increasing boiling point: RbCl, CH3Cl, CH3OH, CH4.

Accepted Answer

A) CH3OH 3Cl 4 
B) CH3OH 4 3Cl 3Cl 3OH 4 
D) CH4 3OH 3Cl 4 3Cl 3OH < RbCl 
A) CH3OH 3Cl 4 
B) CH3OH 4 3Cl 3Cl 3OH 4 
D) CH4 3OH 3Cl 4 3Cl 3OH < RbCl

Exam 12: Intermolecular Forces and Liquids and Solids

The vapor pressure of a liquid in a closed container depends upon

Which one of the following crystallizes in a metallic lattice?

Of the given pair of compounds, which would have the higher boiling point? CCl4 or CH4

Which one of the following substances is expected to have the highest boiling point?

Calculate the amount of heat needed to melt 2.00 kg of iron at its melting point (1,809 K), given that Δ\DeltaΔ Hfus = 13.80 kJ/mol.

Which of the following liquids would have the lowest viscosity at 25°C?

Use the following data to determine the molar heat of vaporization of chlorine. T (°C)-84.5 -71.2 -47.3 P (mmHg)40.0 100.0 400.0

The molar enthalpy of vaporization of hexane (C6H14)is 28.9 kJ/mol, and its normal boiling point is 68.73°C. What is the vapor pressure of hexane at 25°C?

The number of nearest neighbors (atoms that make contact)around each atom in a face-centered cubic lattice of a metal is

Ethanol and dimethyl ether have the same molecular formula, C2H6O. Ethanol boils at 78.4°C. Dimethyl ether boils at -23.7°C. Their structural formulas are, respectively, CH3CH2OH and CH3OCH3. Explain why the boiling point of the ether is so much lower than the boiling point of ethanol.

For which of the following species are the dispersion forces strongest?

Indicate all the types of intermolecular forces of attraction in SF6(g).

Which one of the following substances crystallizes as a molecular solid?

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

Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm?

Which of the following substances should have the lowest boiling point?

Boron nitride, BN3, melts at approximately at 3,000°C under high pressure. This material is almost as hard as diamond. What kind of crystal is this?

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

Arrange the following in order of increasing boiling point: RbCl, CH3Cl, CH3OH, CH4.

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Of the given pair of compounds, which would have the higher boiling point? CCl₄ or CH₄

Calculate the amount of heat needed to melt 2.00 kg of iron at its melting point (1,809 K), given that $\Delta$ H_fus = 13.80 kJ/mol.

The molar enthalpy of vaporization of hexane (C₆H₁₄)is 28.9 kJ/mol, and its normal boiling point is 68.73°C. What is the vapor pressure of hexane at 25°C?

Indicate all the types of intermolecular forces of attraction in SF₆(g).

Boron nitride, BN₃, melts at approximately at 3,000°C under high pressure. This material is almost as hard as diamond. What kind of crystal is this?

Arrange the following in order of increasing boiling point: RbCl, CH₃Cl, CH₃OH, CH₄.