Intermolecularforces PDF

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practice for intermolecular forces...

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Intermolecularforces Student: ___________________________________________________________________________

1. 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. 2. 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 3. 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 4. Which 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

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5. Which of the following should have the lowest boiling point? A.C5H12 B.C6H14 C.C8H18 D.C10H22 E.C12H26 6. Pentane, C5H12, boils at 35°C. Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when liquid pentane at 35°C is compared with pentane vapor at 35°C? A.Ek(g) < Ek(l); Ep(g) Ep(l) B. Ek(g) > Ek(l); Ep(g) Ep(l) C. Ep(g) < Ep(l); Ek(g) Ek(l) D.Ep(g) > Ep(l); Ek(g) Ek(l) E. Ep(g) Ep(l); Ek(g) Ek(l) 7. Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C? A.Ek(40°C) < Ek(20°C); Ep(40°C) B.Ek(40°C) > Ek(20°C); Ep(40°C) C.Ep(40°C) < Ep(20°C); Ek(40°C) D.Ep(40°C) > Ep(20°C); Ek(40°C)

Ep(20°C) Ep(20°C) Ek(20°C) Ek(20°C)

E.Ep(40°C) > Ep(20°C); Ek(40°C) > Ek(20°C) 8. 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 heat of vaporization specific heat capacity, (CH3)2O(l) specific heat capacity, (CH3)2O(g)

34.5°C 351 J/g 3.74 J/(g·K) 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

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9. Which of the following atoms should have the smallest polarizability? A.Si B.S C.Te D.Bi E.Br 10. Which of the following pairs is arranged with the particle of higher polarizability listed first? A.Se2-, S2B.I, IC.Mg2+, Mg D.Br, I E.none of these choices is correct 11. Which of the following has a boiling point which does not fit the general trend? A.NH3 B.PH3 C.AsH3 D.SbH3 E.BiH3

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

A.a B.b C.c D.d E.e

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

A.a B.b C.c D.d E.e

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14. 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.none of these choices is correct

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15. 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

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Intermolecularforces Key 1. (p. Sec. 12. 3)

Ammonia's unusually high melting point is the result of a. b. C d. e.

dipole-dipole forces. London dispersion forces. hydrogen bonding. covalent bonding. ionic bonding. Difficulty: E

2. (p. Sec. 12. 3)

In hydrogen iodide __________________ are the most important intermolecular forces. A b. c. d. e.

dipole-dipole forces London dispersion forces hydrogen bonding covalent bonds polar covalent bonds Difficulty: E

3.

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

(p. 440)

a. B c. d. e.

polarity polarizability dipole moment van der Waals radius compressibility Difficulty: E

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4.

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

(p. 439)

a. b. C d. e.

(CH3)3N CH3-O-CH3 CH3CH2-OH CH3CH2-F HI Difficulty: E

5. (p. Sec. 12. 3)

Which of the following should have the lowest boiling point? A b. c. d. e.

C H12 C65H14 C8H18 C10H22 C12H26 Difficulty: E

6. (p. 429)

Pentane, C5H12, boils at 35°C. Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when liquid pentane at 35°C is compared with pentane vapor at 35°C? a. b. c. D e.

Ek(g) < Ek(l); Ep(g) Ek(g) > Ek(l); Ep(g) Ep(g) < Ep(l); Ek(g) Ep(g) > Ep(l); Ek(g) Ep(g) Ep(l); Ek(g)

Ep(l) Ep(l) Ek(l) Ek(l) Ek(l) Difficulty: M

7. (p. 429)

Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C? a. B c. d.

Ek(40°C) < Ek(20°C); Ep(40°C) Ek(40°C) > Ek(20°C); Ep(40°C) Ep(40°C) < Ep(20°C); Ek(40°C) Ep(40°C) > Ep(20°C); Ek(40°C)

Ep(20°C) Ep(20°C) Ek(20°C) Ek(20°C)

e. Ep(40°C) > Ep(20°C); Ek(40°C) > Ek(20°C) Difficulty: M

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8.

Diethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a 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?

(p. Sec. 12. high 2)

boiling point heat of vaporization specific heat capacity, (CH3)2O(l) specific heat capacity, (CH3)2O(g)

a. b. c. d. E

34.5°C 351 J/g 3.74 J/(g·K) 2.35 J/(g·K)

10.1 kJ 13.1 kJ 16.1 kJ 45.2 kJ 48.6 kJ Difficulty: M

9.

Which of the following atoms should have the smallest polarizability?

(p. 440)

a. B c. d. e.

Si S Te Bi Br Difficulty: M

10.

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

(p. 440)

A b. c. d. e.

Se2-, S2I, IMg2+, Mg Br, I none of these choices is correct Difficulty: M

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11. (p. Sec. 12. 3)

Which of the following has a boiling point which does not fit the general trend? A b. c. d. e.

NH PH33 AsH3 SbH3 BiH3 Difficulty: M

12.

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

(p. Sec. 12. listed 3)

A b. c. d. e.

a b c d e Difficulty: M

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13.

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

(p. 444)

a. b. c. D e.

a b c d e Difficulty: M

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14. (p. 445)

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

a. B c. d. e.

a b c d none of these choices is correct Difficulty: M

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15. (p. 435)

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

a. B c. d. e.

increasing temperature with a phase change from solid to liquid increasing temperature with a phase change from solid to vapor increasing temperature with a phase change from liquid to vapor increasing temperature with no phase change increasing temperature beyond the critical point Difficulty: M

Category

# of Questions

Difficulty: E

5

Difficulty: M

10

7...