Intermolecular Forces Ch.12 Exam Prep 8th Edition

Chapter 12 Test Bank

Intermolecular Forces: Liquids, Solids, and Phase Changes

1. Pentane, C₅H₁₂, boils at 35°C. Which of the following is true about kinetic energy, E_k, and potential energy, E_p, when liquid pentane at 35°C is compared with pentane vapor at 35°C?

A. E_k(g) < E_k(l); E_p(g) ≈ E_p(l)

B. E_k(g) > E_k(l); E_p(g) ≈ E_p(l)

C. E_p(g) < E_p(l); E_k(g) ≈ E_k(l)

D. E_p(g) > E_p(l); E_k(g) ≈ E_k(l)

E. E_p(g) ≈ E_p(l); E_k(g) ≈ E_k(l)

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Classification and States of Matter

Topic: Study of Chemistry

2. Which of the following is true about kinetic energy, E_k, and potential energy, E_p, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

A. E_k(40°C) < E_k(20°C); E_p(40°C) ≈ E_p(20°C)

B. E_k(40°C) > E_k(20°C); E_p(40°C) ≈ E_p(20°C)

C. E_p(40°C) < E_p(20°C); E_k(40°C) ≈ E_k(20°C)

D. E_p(40°C) > E_p(20°C); E_k(40°C) ≈ E_k(20°C)

E. E_p(40°C) > E_p(20°C); E_k(40°C) > E_k(20°C)

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Classification and States of Matter

Topic: Study of Chemistry

3. A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

A. > 50.0 torr

B. 50.0 torr

C. 25.0 torr

D. The mass of the octane vapor is needed to calculate the vapor pressure.

E. The external pressure is needed to calculate the vapor pressure.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

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

A. melting point

B. boiling point

C. triple point

D. heat of fusion

E. heat of vaporization

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

5. The phase diagram for xenon has a solid-liquid curve with a positive slope. Which of the following is true?

A. Solid xenon has a higher density than liquid xenon.

B. Solid xenon has the same density as liquid xenon.

C. The phase diagram cannot be used to predict which phase of xenon is denser.

D. Freezing xenon is an endothermic process.

E. None of these choices are correct.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

6. Liquid ammonia (boiling point = –33.4°C) can be used as a refrigerant and heat transfer fluid.

How much energy is needed to heat 25.0 g of NH₃(l) from –65.0°C to –12.0°C?

Specific heat capacity, NH₃(l): 4.7 J/(g·K)

Specific heat capacity, NH₃(g): 2.2 J/(g·K)

Heat of vaporization: 23.5 kJ/mol

Molar mass, : 17.0 g/mol

A. 5.5 kJ

B. 6.3 kJ

C. 39 kJ

D. 340 kJ

E. 590 kJ

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

7. Diethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a high vapor pressure which makes it a potential fire hazard in laboratories in which it is used. How much energy is released when 100.0 g is cooled from 53.0°C to 10.0°C?

Boiling point: 34.5°C

Heat of vaporization: 351 J/g

Specific heat capacity, (CH₃)₂O(l): 3.74 J/(g·K)

Specific heat capacity, (CH₃)₂O(g): 2.35 J/(g·K)

A. 10.1 kJ

B. 13.1 kJ

C. 16.1 kJ

D. 45.2 kJ

E. 48.6 kJ

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

8. 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.

A. 15.6 kJ

B. 10.2 kJ

C. 5.4 kJ

D. 3.2 kJ

E. 1.6 kJ

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Hard

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

9. Octane has a vapor pressure of 40. torr at 45.1°C and 400. torr at 104.0°C. What is its heat of vaporization?

A. 39.0 kJ/mol

B. 46.0 kJ/mol

C. 590 kJ/mol

D. 710 kJ/mol

E. None of these choices are correct.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

10. Liquid sodium can be used as a heat transfer fluid. Its vapor pressure is 40.0 torr at 633°C and 400.0 torr at 823°C. Calculate its heat of vaporization.

A. 43.4 kJ/mol

B. 52.5 kJ/mol

C. 70.6 kJ/mol

D. 1.00 × 10² kJ/mol

E. None of these choices are correct.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

11. The Clausius-Clapeyron equation is used in calculations of

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.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

12. The normal boiling point of ether is 307.8 K. Calculate the temperature at which its vapor pressure is exactly half of that at its normal boiling point. The heat of vaporization for ether is 26.69 kJ/mol.

A. 305 K

B. 302 K

C. 295 K

D. 289 K

E. 281 K

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

13. Examine the phase diagram for the substance Bogusium (Bo) and select the correct statement.

A. Bo(s) has a lower density than Bo(l).

B. The triple point for Bo is at a higher temperature than the melting point for Bo.

C. Bo changes from a solid to a liquid as one follows the line from C to D.

D. Bo changes from a liquid to a gas as one follows the line from C to D.

E. Point B represents the critical temperature and pressure for Bo.

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

14. Examine the following phase diagram and identify the feature represented by point A.

A. melting point

B. critical point

C. triple point

D. sublimation point

E. boiling point

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

15. Examine the following phase diagram and identify the feature represented by point B.

A. melting point

B. triple point

C. critical point

D. sublimation point

E. boiling point

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

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

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

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

17. Examine the following phase diagram and determine what phase exists at point F.

A. vapor + liquid

B. vapor

C. liquid

D. solid

E. supercritical fluid

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

18. Neon atoms are attracted to each other by

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. covalent bonding.

E. intramolecular forces.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

19. Ammonia's unusually high melting point is the result of

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. covalent bonding.

E. ionic bonding.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. covalent bonds.

E. carbon-hydrogen bonds.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

21. In hydrogen iodide __________________ are the most important intermolecular forces.

A. dipole-dipole forces

B. London dispersion forces

C. hydrogen bonding

D. covalent bonds

E. polar covalent bonds

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Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

A. polarity.

B. polarizability.

C. dipole moment.

D. van der Waals radius.

E. compressibility.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

23. Which of the following atoms should have the greatest polarizability?

A. F

B. Br

C. Po

D. Pb

E. He

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

24. Which of the following atoms should have the smallest polarizability?

A. Si

B. S

C. Te

D. Bi

E. Br

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

25. The strongest intermolecular interactions between pentane (C₅H₁₂) molecules arise from

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. ion-dipole interactions.

E. carbon-carbon bonds.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

26. What types of forces exist between molecules of CO₂?

A. hydrogen bonding only.

B. hydrogen bonding and dispersion forces.

C. dipole-dipole forces only.

D. dipole-dipole and dispersion forces.

E. dispersion forces only.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

27. The strongest intermolecular interactions between ethyl alcohol (CH₃CH₂OH) molecules arise from

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. ion-dipole interactions.

E. carbon-oxygen bonds.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

28. The strongest intermolecular interactions between hydrogen sulfide (H₂S) molecules arise from

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. ion-dipole interactions.

E. disulfide linkages.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

A. dipole-dipole forces.

B. London dispersion forces.

C. hydrogen bonding.

D. ion-dipole interactions.

E. ionic bonds.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

30. Which one of the following substances will have hydrogen bonds between molecules?

A. (CH₃)₃N

B. CH₃–O–CH₃

C. CH₃CH₂–OH

D. CH₃CH₂–F

E. HI

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

31. In which of the following compounds will the molecules not form hydrogen bonds with each other?

A.

B.

C.

D.

E.

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

32. Which of the following pairs of molecules can form hydrogen bonds between them?

A. HCl and HI

B. CH₃OH and NH₃

C. CH₄ and H₂O

D. SO₂ and CH₂O

E. H₂ and O₂

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

A. Se^2–, S^2–

B. I, I^–

C. Mg²⁺, Mg

D. Br, I

E. None of these choices are correct.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

A. CCl₄, CI₄

B. H₂O, H₂Se

C. C₆H₁₄, C₄H₁₀

D. NH₃, NF₃

E. None of these choices are correct.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

35. Which of the following should have the highest boiling point?

A. CF₄

B. CCl₄

C. CBr₄

D. CI₄

E. CH₄

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

36. Which of the following should have the lowest boiling point?

A. C₅H₁₂

B. C₆H₁₄

C. C₈H₁₈

D. C₁₀H₂₂

E. C₁₂H₂₆

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

37. Which of the following has a boiling point that does not fit the general trend?

A. NH₃

B. PH₃

C. AsH₃

D. SbH₃

E. BiH₃

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

A. C₇H₁₆, C₅H₁₂

B. CCl₄, CBr₄

C. H₂O, H₂S

D. CH₃CH₂OH, CH₃–O–CH₃

E. Xe, Kr

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

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

A.

B.

C.

D.

E.

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

40. Comparing the energies of the following intermolecular forces on a kJ/mol basis, which would normally have the highest energy (i.e., be the strongest force)?

A. ion-induced dipole

B. dipole-induced dipole

C. ion-dipole

D. dipole-dipole

E. dispersion

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

41. Which of the following should have the highest surface tension at a given temperature?

A. CH₄

B. CF₄

C. CCl₄

D. CBr₄

E. CI₄

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Easy

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

42. Which of the following should have the highest surface tension at a given temperature?

A.

B.

C.

D.

E.

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

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

A. capillary action

B. surface tension

C. viscosity

D. cohesion

E. specific elasticity

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Topic: Intermolecular Forces

Topic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

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

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.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

45. The meniscus of mercury in a glass capillary tube is convex because of

A. the very high density of mercury as compared with water.

B. the low surface tension of mercury.

C. the greater attraction of mercury atoms to the glass than to each other.

D. the weaker attraction of mercury atoms to the glass than to each other.

E. electrostatic repulsion between the glass and the mercury.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

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

A. surface tension

B. capillary action

C. viscosity

D. adhesion

E. cohesion

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

47. Which of the following factors contributes to a low viscosity for a liquid?

A. low temperature

B. spherical molecular shape

C. hydrogen bonding

D. high molecular weight

E. high boiling point

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

48. Which of the following pairs of substances is arranged so that the one with higher viscosity is listed first?

A. A

B. B

C. C

D. D

E. E

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

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

A. Pb

B. CH₃OCH₃

C. HOCH₂CH₂OH

D. H₂O

E. CH₃CH₂OH

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Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

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

A. Br₂

B. C₈H₁₈

C. CH₃OCH₃

D. CH₃OH

E. Pb

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Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

51. When identical particles pack in a simple cubic lattice, there is/are ____ particle(s) per unit cell.

A. 1

B. 2

C. 3

D. 4

E. 8

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

52. A metal with a body-centered cubic lattice will have ______ atom(s) per unit cell.

A. 1

B. 2

C. 3

D. 4

E. 9

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

53. A metal such with a face-centered cubic lattice will have ________________ atom(s) per unit cell.

A. 1

B. 2

C. 3

D. 4

E. 10

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

54. Polonium crystallizes in the simple cubic lattice. What is the coordination number for Po?

A. 3

B. 4

C. 6

D. 8

E. 12

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

A. 4

B. 6

C. 8

D. 10

E. 12

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

56. Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb?

A. 4

B. 6

C. 8

D. 10

E. 12

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

57. Which one of the following statements about unit cells and packing in solids is incorrect?

A. In any unit cell of a solid crystal, each face of the cell must have an opposite face which is equal and parallel to it.

B. The faces of a unit cell must all be at angles of 90° to each other.

C. The coordination number of atoms in a close packed metal is 12.

D. The packing efficiency in fcc structures is higher than in bcc structures.

E. The packing efficiency in fcc and hcp structures is the same.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Hard

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

58. Which of the following statements concerning a face-centered cubic unit cell and the corresponding lattice, made up of identical atoms, is incorrect?

A. The coordination number of the atoms in the lattice is 8.

B. The packing in this lattice is more efficient than for a body-centered cubic system.

C. If the atoms have radius r, then the length of the cube edge is 8 × r.

D. There are four atoms per unit cell in this type of packing.

E. The packing efficiency in this lattice and hexagonal close packing are the same.

Bloom's: 2. Understand

Difficulty: Hard

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

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.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Hard

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

60. A cubic unit cell has an edge length of 400. pm. The length of its body diagonal (internal diagonal) in pm is therefore

A. 512.

B. 566.

C. 631.

D. 693.

E. 724.

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Hard

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

61. A certain solid metallic element has a density 7.87 g/cm³ and a molar mass of 55.85 g/mol. It crystallizes with a cubic unit cell, with an edge length of 286.7 pm. Calculate the number of atoms per unit cell.

A. 1

B. 2

C. 3

D. 4

E. 6

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Hard

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

62. Crystal structures may be conveniently measured using

A. X-ray diffraction.

B. infrared spectroscopy.

C. ultraviolet-visible spectroscopy.

D. microwave spectroscopy.

E. magnetic resonance imaging.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

A. graphite – network

B. Na – metallic

C. SiO₂ – molecular

D. NaCl – ionic

E. diamond – network

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

64. When liquid bromine is cooled to form a solid, which of the following types of solid would it form?

A. atomic

B. metallic

C. molecular

D. ionic

E. covalent network

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

65. For the solid forms of the following elements, which one is most likely to be of the molecular type?

A. Xe

B. C

C. Pb

D. S

E. Cr

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

66. What adjective best describes the solid compound IF₇?

A. metallic

B. amorphous

C. covalent network

D. molecular

E. ionic

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Easy

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

A. 10 and 10

B. 8 and 8

C. 6 and 6

D. 4 and 4

E. None of these choices are correct.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

A. 1.

B. 2.

C. 6.

D. 8.

E. It is impossible to predict without knowing the crystal structure of MX.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Hard

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

69. A temperature increase causes __________________ in the conductivity of a semiconductor.

A. a decrease

B. an increase

C. a modulation

D. an increase or decrease (depending on the semiconductor)

E. no change

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

70. A temperature increase causes __________________ in the conductivity of a conductor.

A. a decrease

B. an increase

C. an increase or decrease (depending on the conductor)

D. a modulation

E. no change

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

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

A. conductors.

B. semiconductors.

C. superconductors.

D. insulators.

E. alloys.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

72. The highest temperature at which superconductivity has been achieved is approximately

A. 4 K.

B. 30 K.

C. 70 K.

D. 100 K.

E. 130 K.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

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

A. intrinsic semiconductor.

B. p-type semiconductor.

C. n-type semiconductor.

D. p-n junction.

E. transistor.

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

74. What word best describes the type of liquid crystal represented below?

A. nematic

B. cholesteric

C. smectic

D. isotropic

E. elastic

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

75. Which of the following statements about ceramics is incorrect?

A. Silicon carbide has a diamond-like structure.

B. Boron nitride can exist in both diamond-like and graphite-like forms.

C. Silicon carbide can be prepared by direct reaction of silicon and carbon.

D. Superconducting ceramics present manufacturing difficulties owing to their brittleness.

E. Superconducting ceramic compounds usually incorporate cobalt in a key role.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

77. The phase diagram of a substance shows the energy changes associated with changes of state.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

78. Some of the information obtained from the heating or cooling curve of a substance can also be found on a phase diagram of that substance.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

80. All gases can be liquefied at room temperature simply by increasing the pressure on the gas.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

81. If the solid form of a pure substance is denser than its liquid form, an increase in pressure will cause the melting point to decrease.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

82. A liquid may be made to boil at room temperature, simply by lowering the pressure.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Phase Diagrams

Topic: Intermolecular Forces

83. The energy of a hydrogen bond is greater than that of a typical covalent bond.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

85. The surface tension of water is lowered when a detergent is present in solution.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity)

Topic: Intermolecular Forces

86. Only molecules that do not have dipole moments can experience dispersion forces.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Types of Intermolecular Forces

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 2. Understand

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

89. Hexagonal close packing of identical atoms occurs when close-packed layers are stacked in an abcabc... arrangement.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory)

Topic: Intermolecular Forces

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

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

92. Liquid crystal displays are most commonly constructed of smectic type liquid crystals.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

93. Smectic liquid crystals are more highly ordered than either nematic or cholesteric liquid crystals.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Medium

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

94. Ceramic superconductors often contain copper in unusual oxidation states.

Accessibility: Keyboard Navigation

Bloom's: 1. Remember

Difficulty: Easy

Gradable: automatic

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers)

Topic: Intermolecular Forces

95. 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.

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

Accessibility: Keyboard Navigation

Bloom's: 3. Apply

Difficulty: Medium

Gradable: automatic

Subtopic: Phase Changes

Topic: Intermolecular Forces

Category # of Questions

Accessibility: Keyboard Navigation 83

Bloom's: 1. Remember 33

Bloom's: 2. Understand 34

Bloom's: 3. Apply 28

Difficulty: Easy 32

Difficulty: Hard 7

Difficulty: Medium 56

Gradable: automatic 95

Subtopic: Advanced Materials (Ceramic, Liquid Crystal, Semiconductors, Superconductors, Polymers) 11

Subtopic: Classification and States of Matter 2

Subtopic: Phase Changes 7

Subtopic: Phase Diagrams 12

Subtopic: Properties of Liquids (Surface Tension, Viscosity, Capillarity) 17

Subtopic: Solid State: Structure, Properties, and Bonding (Crystalline, Amorphous, Band Theory) 22

Subtopic: Types of Intermolecular Forces 23

Topic: Intermolecular Forces 93

Topic: Properties of Liquids (Surface Tension, Viscosity, Capillarity) 1

Topic: Study of Chemistry 2