Question 1

When silicon is doped with an element from group 3A(13), the device/material produced is a/an

Accepted Answer

A) intrinsic semiconductor. 
B) p-type semiconductor. 
C) n-type semiconductor. 
D) p-n junction. 
E) transistor. 
A) intrinsic semiconductor. 
B) p-type semiconductor. 
C) n-type semiconductor. 
D) p-n junction. 
E) transistor. B

Question 2

Which of the following properties measures the energy needed to increase the surface area of a liquid?

Accepted Answer

A) Capillary action 
B) Surface tension 
C) Viscosity 
D) Cohesion 
E) Specific elasticity 
A) Capillary action 
B) Surface tension 
C) Viscosity 
D) Cohesion 
E) Specific elasticity B

Question 3

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. Estimate the value for the heat of sublimation.

Accepted Answer

A) 35.1 kJ/mol 
B) 13.5 kJ/mol 
C) −13.5 kJ/mol 
D) −35.1 kJ/mol 
E) None of these choices are correct 
A) 35.1 kJ/mol 
B) 13.5 kJ/mol 
C) −13.5 kJ/mol 
D) −35.1 kJ/mol 
E) None of these choices are correct A

Question 4

In cubic closest packing, the unit cell is body-centered cubic.

Accepted Answer

A) True 
 B)False

Question 5

A single water molecule can participate in at most two hydrogen bonds at any instant.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements about the packing of monatomic solids with different unit cells is incorrect?

Accepted Answer

A) The coordination number of atoms in hcp and fcc structures is 12. 
B) The coordination number of atoms in simple cubic structures is 6. 
C) The coordination number of atoms in bcc structures is 8. 
D) A bcc structure has a higher packing efficiency than a simple cubic structure. 
E) A bcc structure has a higher packing efficiency than a fcc structure. 
A) The coordination number of atoms in hcp and fcc structures is 12. 
B) The coordination number of atoms in simple cubic structures is 6. 
C) The coordination number of atoms in bcc structures is 8. 
D) A bcc structure has a higher packing efficiency than a simple cubic structure. 
E) A bcc structure has a higher packing efficiency than a fcc structure.

Question 7

Which one of the following quantities is generally not obtainable from a single heating or cooling curve of a substance, measured at atmospheric pressure?

Accepted Answer

A) Melting point 
B) Boiling point 
C) Triple point 
D) Heat of fusion 
E) Heat of vaporization 
A) Melting point 
B) Boiling point 
C) Triple point 
D) Heat of fusion 
E) Heat of vaporization

Question 8

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.

Question 9

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following liquids is likely to have the highest surface tension?

Accepted Answer

A) Br 2 
B) C 8H 18 
C) CH 3OCH 3 
D) CH 3OH 
E) Pb 
A) Br 2 
B) C 8H 18 
C) CH 3OCH 3 
D) CH 3OH 
E) Pb

Question 11

Consider the following phase diagram and identify the process occurring as one goes from point C to point D.

Accepted Answer

A) Increasing temperature with a phase change from solid to liquid 
B) Increasing temperature with a phase change from solid to vapor 
C) Increasing temperature with a phase change from liquid to vapor 
D) Increasing temperature with no phase change 
E) Increasing temperature beyond the critical point 
A) Increasing temperature with a phase change from solid to liquid 
B) Increasing temperature with a phase change from solid to vapor 
C) Increasing temperature with a phase change from liquid to vapor 
D) Increasing temperature with no phase change 
E) Increasing temperature beyond the critical point

Question 12

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

Question 13

Which of the following should have the lowest boiling point?

Accepted Answer

A) C 5H 12 
B) C 6H 14 
C) C 8H 18 
D) C 10H 22 
E) C 12H 26 
A) C 5H 12 
B) C 6H 14 
C) C 8H 18 
D) C 10H 22 
E) C 12H 26

Question 14

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Accepted Answer

A) Se 2−, S 2− 
B) I, I − 
C) Mg 2+, Mg 
D) Br, I 
E) None of these choices are correct. 
A) Se 2−, S 2− 
B) I, I − 
C) Mg 2+, Mg 
D) Br, I 
E) None of these choices are correct.

Question 15

Crystal structures may be conveniently measured using

Accepted Answer

A) X-ray diffraction. 
B) infrared spectroscopy. 
C) ultraviolet-visible spectroscopy. 
D) microwave spectroscopy. 
E) magnetic resonance imaging. 
A) X-ray diffraction. 
B) infrared spectroscopy. 
C) ultraviolet-visible spectroscopy. 
D) microwave spectroscopy. 
E) magnetic resonance imaging.

Question 16

In a transistor, the current through one semiconductor junction controls the current through a neighboring junction.

Accepted Answer

A) True 
 B)False

Question 17

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 are 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 are correct.

Question 18

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Accepted Answer

A) CCl 4, CI 4 
B) H 2O, H 2Se 
C) C 6H 14, C 4H 10 
D) NH 3, NF 3 
E) None of these choices are correct. 
A) CCl 4, CI 4 
B) H 2O, H 2Se 
C) C 6H 14, C 4H 10 
D) NH 3, NF 3 
E) None of these choices are correct.

Question 19

A 5.00 g sample of water vapor, initially at 155°C is cooled at atmospheric pressure, producing ice at −55°C. Calculate the amount of heat energy lost by the water sample in this process, in kJ. Use the following data: specific heat capacity of ice is 2.09 J/g·K; specific heat capacity of liquid water is 4.18 J/g·K; specific heat capacity of water vapor is 1.84 J/g·K; heat of fusion of ice is 336 J/g; heat of vaporization of water is 2260 J/g.

Accepted Answer

A) 15.6 kJ 
B) 10.2 kJ 
C) 5.4 kJ 
D) 3.2 kJ 
E) 1.6 kJ 
A) 15.6 kJ 
B) 10.2 kJ 
C) 5.4 kJ 
D) 3.2 kJ 
E) 1.6 kJ

Question 20

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases.

Accepted Answer

A) True 
 B)False

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

When silicon is doped with an element from group 3A(13), the device/material produced is a/an

Which of the following properties measures the energy needed to increase the surface area of a liquid?

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. Estimate the value for the heat of sublimation.

In cubic closest packing, the unit cell is body-centered cubic.

A single water molecule can participate in at most two hydrogen bonds at any instant.

Which of the following statements about the packing of monatomic solids with different unit cells is incorrect?

Which one of the following quantities is generally not obtainable from a single heating or cooling curve of a substance, measured at atmospheric pressure?

The highest temperature at which superconductivity has been achieved is approximately

The phase diagram of a substance can be used to obtain the vapor pressure of that substance at a given temperature.

Which of the following liquids is likely to have the highest surface tension?

Consider the following phase diagram and identify the process occurring as one goes from point C to point D.

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

Which of the following should have the lowest boiling point?

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Crystal structures may be conveniently measured using

In a transistor, the current through one semiconductor junction controls the current through a neighboring junction.

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

Which of the following pairs is arranged with the particle of higher polarizability listed first?

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases.

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

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 Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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