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

A) True
B) False

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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.

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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.

F) B) and C)
G) None of the above

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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.

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

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Metals are good conductors who...

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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

F) C) and E)
G) A) and D)

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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

F) None of the above
G) C) and D)

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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?

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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

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

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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) ≈\approx Ep(l)
B) Ek(g) > Ek(l) ;Ep(g) ≈\approx Ep(l)
C) Ep(g) < Ep(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) C) and D)
G) B) and C)

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


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) All of the above
G) None of the above

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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.

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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

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

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

A) True
B) False

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


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

F) A) and E)
G) All of the above

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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?

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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.

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

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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

F) A) and B)
G) All of the above

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Which of the following should have the lowest boiling point?


A) C5H12
B) C6H14
C) C8H18
D) C10H22
E) C12H26

F) None of the above
G) A) and B)

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


A) vapor + liquid
B) vapor
C) liquid
D) solid
E) supercritical fluid

F) None of the above
G) A) and E)

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