Question 1

Which of the following should have the lowest boiling point?

Accepted Answer

A)  C5H12
B)  C6H14
C)  C8H18
D)  C10H22
E)  C12H26F) B) and D)
G) None of the above

Question 2

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?

Accepted Answer

A)  Ek(g) k(l) ;Ep(g)  ≈\approx≈  Ep(l) 
B)  Ek(g) > Ek(l) ;Ep(g)   ≈\approx≈  Ep(l) 
C)  Ep(g) p(l) ;Ek(g)   ≈\approx≈  Ek(l) 
D)  Ep(g) > Ep(l) ;Ek(g)   ≈\approx≈  Ek(l) 
E)  Ep(g)  ≈\approx≈  Ep(l) ;Ek(g)  ≈\approx≈  Ek(l)  F) All of the above
G) B) and D)

Question 3

Mercury melts at -39°C and boils at 357°C.Draw a diagram of the heating curve of mercury.Label all lines and axes,and clearly indicate the melting and boiling points on your diagram.

Accepted Answer

The answer of Mercury melts at -39°C and boils at...

Question 4

How do the electrical properties of semiconductors differ from those of metals?

Accepted Answer

Metals are good conductors who...

Question 5

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)  CH3CH2OHF) A) and E)
G) A) and B)

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A)  vapor + liquid
B)  vapor
C)  liquid
D)  solid
E)  supercritical fluidF) A) and E)
G) B) and D)

Question 8

In hydrogen iodide __________________ are the most important intermolecular forces.

Accepted Answer

A)  dipole-dipole forces
B)  London dispersion forces
C)  hydrogen bonding
D)  covalent bonds
E)  polar covalent bondsF) B) and C)
G) A) and D)

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 face-centered cubic unit cell.

Accepted Answer

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

Question 10

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

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 D)
G) A) and E)

Question 14

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

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) All of the above
G) A) and B)

Question 15

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)  cohesionF) B) and E)
G) A) and B)

Question 16

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

Accepted Answer

A)  a decrease
B)  an increase
C)  an increase or decrease (depending on the conductor) 
D)  a modulation
E)  no changeF) A) and B)
G) B) and E)

Question 17

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol.Calculate its vapor pressure at -50.0°C.

Accepted Answer

The answer of Liquid ammonia boils at -33.4°C and has...

Question 18

a.Explain what is meant by the term "unit cell".
b.Copper metal has a face-centered cubic unit cell.The edge length of the unit cell is 361 pm,and the atomic weight of copper is 63.55 amu.Calculate the density of the copper in g/cm3.
(1 amu = 1.661 $\times$ 10-24 g. )
c.From the data in (b),calculate the radius of a copper atom in pm.

Accepted Answer

a.A unit cell is the smallest repeating ...

Question 19

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

Accepted Answer

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.F) A) and C)
G) None of the above

Question 20

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol.What is the normal boiling point of 1-butene?

Accepted Answer

The answer of The vapor pressure of 1-butene is 1.268...

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

How do the electrical properties of semiconductors differ from those of metals?

Correct Answer
verified
Metals are good conductors who...
View Answer

Correct Answer
verified
a.A unit cell is the smallest repeating ...
View Answer

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol.What is the normal boiling point of 1-butene?

Correct Answer
verified

Mercury melts at -39°C and boils at 357°C.Draw a diagram of the heating curve of mercury.Label all lines and axes,and clearly indicate the melting and boiling points on your diagram.

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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 face-centered cubic unit cell.

Correct Answer
verified

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

Correct Answer
verified

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol.Calculate its vapor pressure at -50.0°C.

Correct Answer
verified

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 Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Which of the following should have the lowest boiling point?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

In hydrogen iodide __________________ are the most important intermolecular forces.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

How do the electrical properties of semiconductors differ from those of metals?

Correct AnswerverifiedMetals are good conductors who...View AnswerShow Answer

Correct Answerverifieda.A unit cell is the smallest repeating ...View AnswerShow Answer

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol.What is the normal boiling point of 1-butene?

Correct AnswerverifiedShow Answer

Mercury melts at -39°C and boils at 357°C.Draw a diagram of the heating curve of mercury.Label all lines and axes,and clearly indicate the melting and boiling points on your diagram.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

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 face-centered cubic unit cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Liquid ammonia boils at -33.4°C and has a heat of vaporization of 23.5 kJ/mol.Calculate its vapor pressure at -50.0°C.

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

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

Correct AnswerverifiedShow Answer

Which of the following should have the lowest boiling point?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In hydrogen iodide __________________ are the most important intermolecular forces.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified
Metals are good conductors who...
View Answer

Correct Answer
verified
a.A unit cell is the smallest repeating ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
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Correct Answer
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Correct Answer
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