Question 1

What phase exists at the point labeled c?

Accepted Answer

The answer of What phase exists at the point labeled...

Question 2

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 3

Indicate all the types of intermolecular forces of attraction in CHCl3(l).

Accepted Answer

dipole-dip

Question 4

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F2, -188.1°C.

Accepted Answer

Question 5

Krypton has a higher melting point than argon because of its

Accepted Answer

A) hydrogen bonding. 
B) stronger dispersion forces. 
C) permanent dipole moment. 
D) ionic bonds. 
E) greater ionization energy. 
A) hydrogen bonding. 
B) stronger dispersion forces. 
C) permanent dipole moment. 
D) ionic bonds. 
E) greater ionization energy.

Question 6

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1)diffraction of 0.154 nm X-rays from a graphite crystal?

Accepted Answer

A) 27.4° 
B) 66.8° 
C) 0.232° 
D) 13.3° 
E) 2.63° 
A) 27.4° 
B) 66.8° 
C) 0.232° 
D) 13.3° 
E) 2.63°

Question 7

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 8

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. 
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.

Question 9

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

Accepted Answer

Question 10

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. 
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.

Question 11

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

Accepted Answer

Question 12

Identify the dominant (strongest)type of intermolecular force present in H2S(g).

Accepted Answer

Question 13

Which is expected to have a higher boiling point, C8H18 or C4H10?

Accepted Answer

Question 14

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 15

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

Accepted Answer

dipole-dip

Question 16

Find the temperature at which ethanol boils on a day in the mountains when the barometric pressure is 547 mmHg.(Given: The heat of vaporization of ethanol is 39.3 kJ/mol; the normal boiling point of ethanol is 78.3°C.)

Accepted Answer

A) 76.5°C 
B) 69.9°C 
C) 10.0°C 
D) 77.9°C 
E) 74.6°C 
A) 76.5°C 
B) 69.9°C 
C) 10.0°C 
D) 77.9°C 
E) 74.6°C

Question 17

Which of the following would be expected to have the lowest 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 18

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 19

Identify the dominant (strongest)type of intermolecular force present in Cl2(l).

Accepted Answer

Question 20

Octane is a liquid component of gasoline. Given the following vapor pressures of octane at various temperatures, estimate the boiling point of octane in Leadville, Colorado, where the atmospheric pressure is 496 mmHg. 400 mmHg @ 104°C, 500 mmHg @ 111°C, 600 mmHg @ 117°C, 700 mmHg @ 122°C, 760 mmHg @ 125°C

Accepted Answer

A) 125°C 
B) 120°C 
C) 115°C 
D) 110°C 
E) 105°C 
A) 125°C 
B) 120°C 
C) 115°C 
D) 110°C 
E) 105°C

Exam 11: Intermolecular Forces and Liquids and Solids

What phase exists at the point labeled c?

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

Indicate all the types of intermolecular forces of attraction in CHCl3(l).

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F2, -188.1°C.

Krypton has a higher melting point than argon because of its

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1)diffraction of 0.154 nm X-rays from a graphite crystal?

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 properties indicates the presence of strong intermolecular forces in a liquid?

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

A liquid boils when its

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

Identify the dominant (strongest)type of intermolecular force present in H2S(g).

Which is expected to have a higher boiling point, C8H18 or C4H10?

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

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

Find the temperature at which ethanol boils on a day in the mountains when the barometric pressure is 547 mmHg.(Given: The heat of vaporization of ethanol is 39.3 kJ/mol; the normal boiling point of ethanol is 78.3°C.)

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

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

Identify the dominant (strongest)type of intermolecular force present in Cl2(l).

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

Synthetic and Natural Organic Polymers

Filters

Indicate all the types of intermolecular forces of attraction in CHCl₃(l).

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F₂, -188.1°C.

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.

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

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

Identify the dominant (strongest)type of intermolecular force present in H₂S(g).

Which is expected to have a higher boiling point, C₈H₁₈ or C₄H₁₀?

Identify the dominant (strongest)type of intermolecular force present in Cl₂(l).