Question 1

What type of crystal lattice is found in a sample of table salt, NaCl?

Accepted Answer

A) simple cubic 
B) base-centered cubic 
C) body-centered cubic 
D) face-centered cubic 
E) orthorhombic-centered cubic 
A) simple cubic 
B) base-centered cubic 
C) body-centered cubic 
D) face-centered cubic 
E) orthorhombic-centered cubic

Question 2

Gold crystallizes in a face-centered cubic lattice. How many unit cells are there in a gold sample whose mass is 1.50 grams? The atomic weight of gold is 196.97 g mol-1.Hint: Use dimensional analysis and the number of atoms per unit cell.

Accepted Answer

A) 1.15 × 1021 unit cells 
B) 2.29 × 1021 unit cells 
C) 3.28 × 1020 unit cells 
D) 4.58 × 1021 unit cells 
E) 9.17 × 1021 unit cells 
A) 1.15 × 1021 unit cells 
B) 2.29 × 1021 unit cells 
C) 3.28 × 1020 unit cells 
D) 4.58 × 1021 unit cells 
E) 9.17 × 1021 unit cells

Question 3

X-ray diffraction measurements revealed that $\alpha$-Fe crystallizes in a face-centered cubic lattice in which the unit cell edge length is 286.6 picometers. Calculate the atomic radius of the Fe atoms in this crystal, based on the assumption that the atoms are tightly packed in the unit cell.Hint: Find the length of the cell face diagonal using the Pythagorean theorem.

Accepted Answer

A) 71.7 pm 
B) 101.3 pm 
C) 124.1 pm 
D) 143.3 pm 
E) 248.2 pm 
A) 71.7 pm 
B) 101.3 pm 
C) 124.1 pm 
D) 143.3 pm 
E) 248.2 pm

Question 4

When a solid undergoes a change of state to a gas, the process is called

Accepted Answer

A) condensation. 
B) deposition. 
C) fusion. 
D) sublimation. 
E) evaporation. 
A) condensation. 
B) deposition. 
C) fusion. 
D) sublimation. 
E) evaporation.

Question 5

Which compound will have the strongest intermolecular forces?

Accepted Answer

A) CH3-CH2-H 
B) CH3-CH2-O-H 
C) CH3-CH2-PH2 
D) CH3-CH2-S-H 
E) CH3-CH2-Se-H 
A) CH3-CH2-H 
B) CH3-CH2-O-H 
C) CH3-CH2-PH2 
D) CH3-CH2-S-H 
E) CH3-CH2-Se-H

Question 6

Which molecule is most polarizable and subject to significant instantaneous dipole-induced dipole forces?

Accepted Answer

A) H3C-Br 
B) H3C-Cl 
C) H3C-F 
D) H3C-H 
E) H3C-I 
A) H3C-Br 
B) H3C-Cl 
C) H3C-F 
D) H3C-H 
E) H3C-I

Question 7

A liquid will evaporate at a given temperature until ________ is reached.

Accepted Answer

The answer of A liquid will evaporate at a given...

Question 8

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled.  
-If the substance starts at a pressure of 500 torr and 105°C and is cooled to 50°C, what phase transition will occur?

Accepted Answer

The answer of The following questions refer to the basic...

Question 9

Which of the following is not a factor that directly affects the viscosity of a liquid?

Accepted Answer

A) length of the molecule 
B) polarizability 
C) density 
D) branching of molecule 
E) temperature 
A) length of the molecule 
B) polarizability 
C) density 
D) branching of molecule 
E) temperature

Question 10

Find the boiling temperature at 760 torr of an isomer of octane, C8H18, if its heat of vaporization is 38,210 J mol-1 and its vapor pressure at 110.0°C is 638.43 torr.

Accepted Answer

A) 111.52°C 
B) 113.22°C 
C) 115.00°C 
D) 115.65°C 
E) 118.30°C 
A) 111.52°C 
B) 113.22°C 
C) 115.00°C 
D) 115.65°C 
E) 118.30°C

Question 11

Iron crystallizes in a body-centered cubic lattice. How many unit cells are in an iron sample whose mass is 1.50 grams? The molar mass of iron is 55.85 g mol-1.Hint: Use dimensional analysis and the number of atoms per unit cell.

Accepted Answer

A) 1.80 × 1021 unit cells 
B) 3.23 × 1022 unit cells 
C) 4.04 × 1021 unit cells 
D) 8.09 × 1021 unit cells 
E) 1.62 × 1022 unit cells 
A) 1.80 × 1021 unit cells 
B) 3.23 × 1022 unit cells 
C) 4.04 × 1021 unit cells 
D) 8.09 × 1021 unit cells 
E) 1.62 × 1022 unit cells

Question 12

Using Le Châtelier's Principle and what you know about phase transitions, explain how a person coming out of a swimming pool in Arizona on a 90°F day is more likely to become cold than someone getting out of a swimming pool in Florida on a 90°F day.

Accepted Answer

Arizona has a very dry climate in compar

Question 13

22.4 g of a solid with a molecular weight of 148.0 g/mol is at its melting point. If this solid requires 5.358 kJ of heat to melt it, what is the molar heat of fusion, in kJ/mol, for this solid?

Accepted Answer

A) 1.23 × 104 kJ/mol 
B) 0.811 kJ/mol 
C) 35.4 kJ/mol 
D) 0.0282 kJ/mol 
E) 1.78 × 104 kJ/mol 
A) 1.23 × 104 kJ/mol 
B) 0.811 kJ/mol 
C) 35.4 kJ/mol 
D) 0.0282 kJ/mol 
E) 1.78 × 104 kJ/mol

Question 14

Which covalent compound will exhibit hydrogen bonding in the liquid state?

Accepted Answer

A) PH3 
B) H2 
C) CH4 
D) NH3 
E) H2S 
A) PH3 
B) H2 
C) CH4 
D) NH3 
E) H2S

Question 15

A substance with a high boiling point has ________ intermolecular forces in the liquid form.

Accepted Answer

The answer of A substance with a high boiling point...

Question 16

The unit cell below is best described as what type of crystal structure?

Accepted Answer

A) Body-centered cubic 
B) Simple cubic 
C) Trigonal 
D) Face-centered cubic 
E) Octahedral 
A) Body-centered cubic 
B) Simple cubic 
C) Trigonal 
D) Face-centered cubic 
E) Octahedral

Question 17

The ease with which the electron cloud of an atom or molecule is distorted is called the ________ of the atom or molecule.

Accepted Answer

The answer of The ease with which the electron cloud...

Question 18

The strongest intermolecular forces between molecules of NO are

Accepted Answer

A) covalent bonds. 
B) dipole-dipole interactions. 
C) ionic bonds. 
D) hydrogen bonds. 
E) London forces. 
A) covalent bonds. 
B) dipole-dipole interactions. 
C) ionic bonds. 
D) hydrogen bonds. 
E) London forces.

Question 19

The following questions refer to the phase diagram below.  
-What phase should this substance exist as, at a pressure of 1500 torr and a temperature of -20°C?

Accepted Answer

A) solid 
B) liquid 
C) gas 
D) supercritical fluid 
E) unable to tell 
A) solid 
B) liquid 
C) gas 
D) supercritical fluid 
E) unable to tell

Question 20

What lies in the geometric center of a unit cell of sodium chloride (face-centered cubic)?

Accepted Answer

A) a sodium ion 
B) a chloride ion 
C) a sodium atom 
D) a chlorine atom 
E) No atoms or ions lie in the geometric center of this unit cell, 
A) a sodium ion 
B) a chloride ion 
C) a sodium atom 
D) a chlorine atom 
E) No atoms or ions lie in the geometric center of this unit cell,

Exam 12: Intermolecular Attractions and the Properties of Liquids and Solids

What type of crystal lattice is found in a sample of table salt, NaCl?

Gold crystallizes in a face-centered cubic lattice. How many unit cells are there in a gold sample whose mass is 1.50 grams? The atomic weight of gold is 196.97 g mol-1.Hint: Use dimensional analysis and the number of atoms per unit cell.

When a solid undergoes a change of state to a gas, the process is called

Which compound will have the strongest intermolecular forces?

Which molecule is most polarizable and subject to significant instantaneous dipole-induced dipole forces?

A liquid will evaporate at a given temperature until ________ is reached.

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. -If the substance starts at a pressure of 500 torr and 105°C and is cooled to 50°C, what phase transition will occur?

Which of the following is not a factor that directly affects the viscosity of a liquid?

Find the boiling temperature at 760 torr of an isomer of octane, C8H18, if its heat of vaporization is 38,210 J mol-1 and its vapor pressure at 110.0°C is 638.43 torr.

Iron crystallizes in a body-centered cubic lattice. How many unit cells are in an iron sample whose mass is 1.50 grams? The molar mass of iron is 55.85 g mol-1.Hint: Use dimensional analysis and the number of atoms per unit cell.

Using Le Châtelier's Principle and what you know about phase transitions, explain how a person coming out of a swimming pool in Arizona on a 90°F day is more likely to become cold than someone getting out of a swimming pool in Florida on a 90°F day.

22.4 g of a solid with a molecular weight of 148.0 g/mol is at its melting point. If this solid requires 5.358 kJ of heat to melt it, what is the molar heat of fusion, in kJ/mol, for this solid?

Which covalent compound will exhibit hydrogen bonding in the liquid state?

A substance with a high boiling point has ________ intermolecular forces in the liquid form.

The unit cell below is best described as what type of crystal structure?

The ease with which the electron cloud of an atom or molecule is distorted is called the ________ of the atom or molecule.

The strongest intermolecular forces between molecules of NO are

The following questions refer to the phase diagram below. -What phase should this substance exist as, at a pressure of 1500 torr and a temperature of -20°C?

What lies in the geometric center of a unit cell of sodium chloride (face-centered cubic)?

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Mixtures at the Molecular Level: Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

Gold crystallizes in a face-centered cubic lattice. How many unit cells are there in a gold sample whose mass is 1.50 grams? The atomic weight of gold is 196.97 g mol^-1.Hint: Use dimensional analysis and the number of atoms per unit cell.

Find the boiling temperature at 760 torr of an isomer of octane, C₈H₁₈, if its heat of vaporization is 38,210 J mol^-1 and its vapor pressure at 110.0°C is 638.43 torr.

Iron crystallizes in a body-centered cubic lattice. How many unit cells are in an iron sample whose mass is 1.50 grams? The molar mass of iron is 55.85 g mol^-1.Hint: Use dimensional analysis and the number of atoms per unit cell.