Question 1

Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.

Accepted Answer

A)  C7H16, C5H12 
B)  CCl4, CBr4 
C)  H2O, H2S 
D)  
CH3CH2OH, CH3  
  O
  CH3 
E)  Xe, Kr 
A)  C7H16, C5H12 
B)  CCl4, CBr4 
C)  H2O, H2S 
D)  
CH3CH2OH, CH3  
  O
  CH3 
E)  Xe, Kr

Question 2

The strongest intermolecular interactions between hydrogen fluoride (HF) molecules arise from

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  ionic bonds. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  ionic bonds.

Question 3

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  covalent bonds. 
E)  carbon-hydrogen bonds. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  covalent bonds. 
E)  carbon-hydrogen bonds.

Question 4

The energy gap between the conduction band and the valence band is large for

Accepted Answer

A)  conductors. 
B)  semiconductors. 
C)  superconductors. 
D)  insulators. 
E)  alloys. 
A)  conductors. 
B)  semiconductors. 
C)  superconductors. 
D)  insulators. 
E)  alloys.

Question 5

List the three common classes of liquid crystals in order of decreasing degree of order.

Accepted Answer

smectic >

Question 6

The coordination number of sodium and chloride ions in the NaCl lattice, are, respectively:

Accepted Answer

A)  10 and 10 
B)  8 and 8 
C)  6 and 6 
D)  4 and 4 
E)  None of these choices is correct. 
A)  10 and 10 
B)  8 and 8 
C)  6 and 6 
D)  4 and 4 
E)  None of these choices is correct.

Question 7

When the adhesive forces between a liquid and the walls of a capillary tube are greater than the cohesive forces within the liquid

Accepted Answer

A)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
B)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
C)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
D)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
E)  None of these choices is correct. 
A)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
B)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
C)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
D)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
E)  None of these choices is correct.

Question 8

What adjective best describes the solid compound IF7?

Accepted Answer

A)  metallic 
B)  amorphous 
C)  covalent network 
D)  molecular 
E)  ionic 
A)  metallic 
B)  amorphous 
C)  covalent network 
D)  molecular 
E)  ionic

Question 9

Draw a fully labeled phase diagram (P versus T) of a substance whose solid phase can melt due to applied pressure (i.e., solid is less dense than liquid). Clearly label the triple point and the critical temperature on your diagram.

Accepted Answer

The answer of Draw a fully labeled phase diagram (P...

Question 10

In an ionic solid MX consisting of the monatomic ions, M+ and X-, the coordination number of M+ is ___.

Accepted Answer

A)  1 
B)  2 
C)  6 
D)  8 
E)  impossible to predict without knowing the crystal structure of MX 
A)  1 
B)  2 
C)  6 
D)  8 
E)  impossible to predict without knowing the crystal structure of MX

Question 11

Which of the following liquid substances would you expect to have the lowest surface tension?

Accepted Answer

A)  Pb 
B)  CH3OCH3 
C)  HOCH2CH2OH 
D)  H2O 
E)  CH3CH2OH 
A)  Pb 
B)  CH3OCH3 
C)  HOCH2CH2OH 
D)  H2O 
E)  CH3CH2OH

Question 12

The Clausius-Clapeyron equation is used in calculations of

Accepted Answer

A)  melting and freezing points. 
B)  vapor pressures of liquids. 
C)  osmotic pressures of solutions. 
D)  heats of vaporization at different temperatures. 
E)  crystal structure. 
A)  melting and freezing points. 
B)  vapor pressures of liquids. 
C)  osmotic pressures of solutions. 
D)  heats of vaporization at different temperatures. 
E)  crystal structure.

Question 13

Which one of the following substances does not exist in the indicated solid type?

Accepted Answer

A)  graphite - network 
B)  Na - metallic 
C)  SiO2 - molecular 
D)  NaCl - ionic 
E)  diamond - network 
A)  graphite - network 
B)  Na - metallic 
C)  SiO2 - molecular 
D)  NaCl - ionic 
E)  diamond - network

Question 14

Which of the following terms refers to the resistance of a liquid to flow?

Accepted Answer

A)  surface tension 
B)  capillary action 
C)  viscosity 
D)  adhesion 
E)  cohesion 
A)  surface tension 
B)  capillary action 
C)  viscosity 
D)  adhesion 
E)  cohesion

Question 15

In metals, the conduction bands and valence bands of the molecular orbitals are separated by a large energy gap.

Accepted Answer

A) True 
 B)False

Question 16

The maximum number of phases of a single substance which can coexist in equilibrium is two.

Accepted Answer

A) True 
 B)False

Question 17

Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  10 
E)  12 
A)  4 
B)  6 
C)  8 
D)  10 
E)  12

Question 18

Which of the following should have the lowest boiling point?

Accepted Answer

A)  C5H12 
B)  C6H14 
C)  C8H18 
D)  C10H22 
E)  C12H26 
A)  C5H12 
B)  C6H14 
C)  C8H18 
D)  C10H22 
E)  C12H26

Question 19

When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.

Accepted Answer

A)  polarity 
B)  polarizability 
C)  dipole moment 
D)  van der Waals radius 
E)  compressibility 
A)  polarity 
B)  polarizability 
C)  dipole moment 
D)  van der Waals radius 
E)  compressibility

Question 20

The highest temperature at which superconductivity has been achieved is approximately:

Accepted Answer

A)  4 K 
B)  30 K 
C)  70 K 
D)  100 K 
E)  130 K 
A)  4 K 
B)  30 K 
C)  70 K 
D)  100 K 
E)  130 K

Exam 12: Intermolecular Forces: Liquids, Solids, and Phase Changes

Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.

The strongest intermolecular interactions between hydrogen fluoride (HF) molecules arise from

Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are

The energy gap between the conduction band and the valence band is large for

List the three common classes of liquid crystals in order of decreasing degree of order.

The coordination number of sodium and chloride ions in the NaCl lattice, are, respectively:

When the adhesive forces between a liquid and the walls of a capillary tube are greater than the cohesive forces within the liquid

What adjective best describes the solid compound IF7?

Draw a fully labeled phase diagram (P versus T) of a substance whose solid phase can melt due to applied pressure (i.e., solid is less dense than liquid). Clearly label the triple point and the critical temperature on your diagram.

In an ionic solid MX consisting of the monatomic ions, M+ and X-, the coordination number of M+ is ___.

Which of the following liquid substances would you expect to have the lowest surface tension?

The Clausius-Clapeyron equation is used in calculations of

Which one of the following substances does not exist in the indicated solid type?

Which of the following terms refers to the resistance of a liquid to flow?

In metals, the conduction bands and valence bands of the molecular orbitals are separated by a large energy gap.

The maximum number of phases of a single substance which can coexist in equilibrium is two.

Iron crystallizes in the body-centered cubic lattice. What is the coordination number for Fe?

Which of the following should have the lowest boiling point?

When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.

The highest temperature at which superconductivity has been achieved is approximately:

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

What adjective best describes the solid compound IF₇?

In an ionic solid MX consisting of the monatomic ions, M⁺ and X^-, the coordination number of M⁺ is ___.