Question 1

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

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   10F) A) and B)
G) A) and C)

Question 2

Which of the following should have the highest boiling point?

Accepted Answer

A)   CF4
B)   CCl4
C)   CBr4
D)   CI4
E)   CH4F) A) and B)
G) A) and C)

Question 3

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

Accepted Answer

A)   HCl and HI
B)   CH3OH and NH3
C)   CH4 and H2O
D)   SO2 and CH2O
E)   H2 and O2F) D) and E)
G) None of the above

Question 4

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

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   ion-dipole interactions.
E)   disulfide linkages.F) B) and D)
G) B) and E)

Question 5

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

Accepted Answer

A)   CCl4, CI4
B)   H2O, H2Se
C)   C6H14, C4H10
D)   NH3, NF3
E)   none of the aboveF) A) and D)
G) C) and D)

Question 6

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

Accepted Answer

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.F) B) and D)
G) B) and C)

Question 7

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.

Accepted Answer

A)   43.4 kJ/mol
B)   52.5 kJ/mol
C)   70.6 kJ/mol
D)   1.00 × 102 kJ/mol
E)   none of the aboveF) A) and E)
G) C) and D)

Question 8

a. Name the two unit cells which occur in close packing of identical atoms.
b. Briefly explain how the two types of close-packed lattices of identical atoms differ, in terms of atomic arrangements.

Accepted Answer

a. face-centered cubic; hexagonal
b. Cub...

Question 9

Assuming that atoms are spherical, calculate the fraction of space which is occupied by atoms (i.e., the packing efficiency) in a metal with a simple cubic unit cell.

Accepted Answer

The answer of Assuming that atoms are spherical, calculate the...

Question 10

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

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   ion-dipole interactions.
E)   carbon-oxygen bonds.F) D) and E)
G) All of the above

Question 11

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.

Accepted Answer

A) True 
 B)False

Question 12

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)   12F) A) and B)
G) A) and D)

Question 13

Consider the phase diagram shown below.  a. What phase(s) is/are present at point A?
b. What phase(s) is/are present at point B?
c. Name point C and explain its significance.
d. Starting at D, if the pressure is lowered while the temperature remains constant, describe what will happen.

Accepted Answer

a. liquid
b. solid, liquid, and gas
c. C...

Question 14

Chlorine trifluoride is used in processing nuclear reactor fuel. It has a vapor pressure of 29.1 torr at -47.0°C and its heat of vaporization is 30.61 kJ/mol. At what temperature would its vapor pressure be 107.7 torr?

Accepted Answer

The answer of Chlorine trifluoride is used in processing nuclear...

Question 15

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.

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   6F) B) and D)
G) A) and E)

Question 16

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 vaporizationF) C) and E)
G) B) and E)

Question 17

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.

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 MXF) All of the above
G) None of the above

Question 20

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

Accepted Answer

A)   low temperature
B)   spherical molecular shape
C)   hydrogen bonding
D)   high molecular weight
E)   high boiling pointF) A) and E)
G) C) and D)

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

a. Name the two unit cells which occur in close packing of identical atoms. b. Briefly explain how the two types of close-packed lattices of identical atoms differ, in terms of atomic arrangements.

Correct Answerverifieda. face-centered cubic; hexagonalb. Cub...View AnswerShow Answer

Which of the following should have the highest boiling point?

Correct AnswerverifiedShow Answer

Consider the phase diagram shown below. a. What phase(s) is/are present at point A? b. What phase(s) is/are present at point B? c. Name point C and explain its significance. d. Starting at D, if the pressure is lowered while the temperature remains constant, describe what will happen.

Correct Answerverifieda. liquidb. solid, liquid, and gasc. C...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Assuming that atoms are spherical, calculate the fraction of space which is occupied by atoms (i.e., the packing efficiency) in a metal with a simple cubic unit cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Chlorine trifluoride is used in processing nuclear reactor fuel. It has a vapor pressure of 29.1 torr at -47.0°C and its heat of vaporization is 30.61 kJ/mol. At what temperature would its vapor pressure be 107.7 torr?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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a. face-centered cubic; hexagonal
b. Cub...
View Answer

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a. liquid
b. solid, liquid, and gas
c. C...
View Answer

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

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

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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.

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

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