Question 1

What is the difference between intermolecular interactions and intramolecular interactions in a molecule?

Accepted Answer

Intermolecular refers to inter

Question 2

What is the mass of a sample of silver that has 5.00 × 1022 unit cells, if the silver crystallizes in a face-centered cubic lattice? The molar mass of silver is 107.87 g mol-1Hint: Use dimensional analysis and the number of atoms per unit cell.

Accepted Answer

A) 8.96 g 
B) 14.2 g 
C) 35.8 g 
D) 71.6 g 
E) 128.8 g 
A) 8.96 g 
B) 14.2 g 
C) 35.8 g 
D) 71.6 g 
E) 128.8 g

Question 3

Arrange these compounds in order of increasing intermolecular forces:CCl4, GeCl4, SiCl4, SnCl4.

Accepted Answer

CCl₄ < SiCl

Question 4

The term "London forces"is a synonym for

Accepted Answer

A) ion-ion forces. 
B) permanent dipole-permanent dipole interactions. 
C) hydrogen bonding. 
D) instantaneous dipole-instantaneous dipole interactions. 
E) instantaneous dipole-induced dipole interactions. 
A) ion-ion forces. 
B) permanent dipole-permanent dipole interactions. 
C) hydrogen bonding. 
D) instantaneous dipole-instantaneous dipole interactions. 
E) instantaneous dipole-induced dipole interactions.

Question 5

The following questions refer to the phase diagram below. Gas, liquid, and solid phases are all present, but not labeled.  
-Starting at the temperature and pressure of c, if the pressure is increased at constant temperature, ultimately

Accepted Answer

A) the substance will sublime. 
B) the substance will undergo fusion. 
C) the substance will undergo deposition. 
D) the substance will freeze. 
E) the substance will undergo condensation. 
A) the substance will sublime. 
B) the substance will undergo fusion. 
C) the substance will undergo deposition. 
D) the substance will freeze. 
E) the substance will undergo condensation.

Question 6

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled.  
-What phase of this substance exists at 760 torr and 50°C?

Accepted Answer

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

Question 7

The heat capacity of liquid water is 4.18 J g-1 °C-1 and its heat of vaporization is 40.7 kJ/mol. From this information, ________ kJ of heat must be provided to convert 1.50 g of liquid water at 57°C into 1.50 g of steam at 100°C.

Accepted Answer

Question 8

How many atoms are contained in one unit cell of metallic tungsten, if it forms a face-centered cubic unit cell?

Accepted Answer

A) 2 
B) 4 
C) 8 
D) 9 
E) 14 
A) 2 
B) 4 
C) 8 
D) 9 
E) 14

Question 9

Which property of water allows some bugs to be able to walk on the surface of water?

Accepted Answer

The answer of Which property of water allows some bugs...

Question 10

Which compound should have the lowest boiling point?

Accepted Answer

A) CH3-Br 
B) CH3-Cl 
C) CH3-F 
D) CH3-H 
E) CH3-I 
A) CH3-Br 
B) CH3-Cl 
C) CH3-F 
D) CH3-H 
E) CH3-I

Question 11

The surface tension of a liquid depends on the strength of the substance's intermolecular attractive forces.

Accepted Answer

A) True 
 B)False

Question 12

A liquid in a covered container is in equilibrium with its vapor. If the cover is removed, what is the immediate result?

Accepted Answer

A) The average kinetic energy increases. 
B) The evaporation rate decreases. 
C) The evaporation rate increases. 
D) The condensation rate decreases. 
E) The condensation rate increases. 
A) The average kinetic energy increases. 
B) The evaporation rate decreases. 
C) The evaporation rate increases. 
D) The condensation rate decreases. 
E) The condensation rate increases.

Question 13

Given the following substances and their normal boiling points, in °C:   Which ranking correctly lists some of these substances in order of decreasing vapor pressure at 20°C?

Accepted Answer

A) C > R > D 
B) D > T > R 
C) R > M > D 
D) C > D > M 
E) D > R > M 
A) C > R > D 
B) D > T > R 
C) R > M > D 
D) C > D > M 
E) D > R > M

Question 14

X-ray diffraction measurements revealed that Cu crystallizes in a face-centered cubic lattice in which the unit cell edge length is 361.5 picometers. Calculate the atomic radius of the Cu 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) 90.4 pm 
B) 127.8 pm 
C) 156.5 pm 
D) 170.4 pm 
E) 180.8 pm 
A) 90.4 pm 
B) 127.8 pm 
C) 156.5 pm 
D) 170.4 pm 
E) 180.8 pm

Question 15

Broken laboratory glass can sometimes be repaired by using heat to melt the glass pieces back together at the break or to melt shut a crack. Often the glass will crack easily at these repair joints, unless it undergoes a process called annealing. Annealing raises the temperature of the glass to just below the melting point and slowly lets it cool down to room temperature. After annealing, the glassware is often just like new. Using your knowledge of amorphous solids, why does annealing strengthen the glassware?

Accepted Answer

After melting back together, the composi

Question 16

Benzophenone, C13H10O, has a heat of fusion of 98.45 J g-1 and its melting point temperature is 47.85°C. How much heat is required to transform 126 g of solid benzophenone at 47.85°C into liquid benzophenone, also at 47.85°C?

Accepted Answer

A) 4.71 kJ 
B) 6.03 kJ 
C) 12.4 kJ 
D) 31.6 kJ 
E) 40.4 kJ 
A) 4.71 kJ 
B) 6.03 kJ 
C) 12.4 kJ 
D) 31.6 kJ 
E) 40.4 kJ

Question 17

Which of the following compounds should have the largest value for heat of fusion ($\Delta$Hfus)?

Accepted Answer

A) NH3 
B) CH3-Cl 
C) N2 
D) HCl 
A) NH3 
B) CH3-Cl 
C) N2 
D) HCl

Question 18

An isobar is a line of constant pressure which runs parallel to the temperature axis on the phase diagram for a substance. As we vary temperature along an isobar that lies below the triple point, which process would never be observed?

Accepted Answer

A) decrease in volume 
B) deposition 
C) expansion 
D) fusion 
E) sublimation 
A) decrease in volume 
B) deposition 
C) expansion 
D) fusion 
E) sublimation

Question 19

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled.  
-The triple point of this substance is at ________ atm and ________ °C.

Accepted Answer

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

Question 20

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

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

What is the difference between intermolecular interactions and intramolecular interactions in a molecule?

What is the mass of a sample of silver that has 5.00 × 1022 unit cells, if the silver crystallizes in a face-centered cubic lattice? The molar mass of silver is 107.87 g mol-1Hint: Use dimensional analysis and the number of atoms per unit cell.

Arrange these compounds in order of increasing intermolecular forces:CCl4, GeCl4, SiCl4, SnCl4.

The term "London forces"is a synonym for

The following questions refer to the phase diagram below. Gas, liquid, and solid phases are all present, but not labeled. -Starting at the temperature and pressure of c, if the pressure is increased at constant temperature, ultimately

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. -What phase of this substance exists at 760 torr and 50°C?

The heat capacity of liquid water is 4.18 J g-1 °C-1 and its heat of vaporization is 40.7 kJ/mol. From this information, ________ kJ of heat must be provided to convert 1.50 g of liquid water at 57°C into 1.50 g of steam at 100°C.

How many atoms are contained in one unit cell of metallic tungsten, if it forms a face-centered cubic unit cell?

Which property of water allows some bugs to be able to walk on the surface of water?

Which compound should have the lowest boiling point?

The surface tension of a liquid depends on the strength of the substance's intermolecular attractive forces.

A liquid in a covered container is in equilibrium with its vapor. If the cover is removed, what is the immediate result?

Given the following substances and their normal boiling points, in °C: Which ranking correctly lists some of these substances in order of decreasing vapor pressure at 20°C?

Benzophenone, C13H10O, has a heat of fusion of 98.45 J g-1 and its melting point temperature is 47.85°C. How much heat is required to transform 126 g of solid benzophenone at 47.85°C into liquid benzophenone, also at 47.85°C?

Which of the following compounds should have the largest value for heat of fusion ( Δ\DeltaΔ Hfus)?

An isobar is a line of constant pressure which runs parallel to the temperature axis on the phase diagram for a substance. As we vary temperature along an isobar that lies below the triple point, which process would never be observed?

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. -The triple point of this substance is at ________ atm and ________ °C.

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

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

What is the mass of a sample of silver that has 5.00 × 10²² unit cells, if the silver crystallizes in a face-centered cubic lattice? The molar mass of silver is 107.87 g mol^-1Hint: Use dimensional analysis and the number of atoms per unit cell.

Arrange these compounds in order of increasing intermolecular forces:CCl₄, GeCl₄, SiCl₄, SnCl_4.

The heat capacity of liquid water is 4.18 J g^-1 °C^-1 and its heat of vaporization is 40.7 kJ/mol. From this information, ________ kJ of heat must be provided to convert 1.50 g of liquid water at 57°C into 1.50 g of steam at 100°C.

Benzophenone, C₁₃H₁₀O, has a heat of fusion of 98.45 J g^-1 and its melting point temperature is 47.85°C. How much heat is required to transform 126 g of solid benzophenone at 47.85°C into liquid benzophenone, also at 47.85°C?

Which of the following compounds should have the largest value for heat of fusion ( $\Delta$ H_fus)?

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. -The triple point of this substance is at atm and °C.