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Chemistry, 7/e
Raymond Chang, Williams College
Metallurgy and the Chemistry of Metals

Self Assessment A



1

The debris attached to a mineral that is often separated by the flotation process is called
A)slag
B)nodules
C)halite
D)ore
E)gangue
2

Pyrometallurgy is a procedure that uses _____ to separate a metal from its ore.
A)acids
B)heat
C)an electric current
D)high pressure
E)caustic solutions
3

According to the band theory, which of the following provide(s) an explanation for the high electrical conductivity of metals? (1) a valence band overlapping an empty conduction band; (2) a filled valence band; (3) a large gap between the valence band and the conduction band.
A)1
B)2
C)3
D)1 and 2
E)1 and 3
4

In n-type semiconductors,
A)the energy gap between the valence band and the conduction band is small.
B)the material contains impurities that donate electrons to provide conduction electrons.
C)the material contains impurities that have fewer valence electrons than the atoms in the host crystal.
D)A and B
E)A and C
5

To say that most metals are malleable means that they
A)can be hammered flat.
B)can be drawn into rods and wires.
C)can conduct electricity.
D)are good heat conductors.
E)occur naturally as oxides.
6

Saltpeter is another name for
A)Na2CO3.
B)KNO3.
C)Mg(OH)2.
D)MgO.
E)Al2O3.
7

Lime, a compound often used to lower the acidity of soil, is
A)MgO.
B)NaOH.
C)CaCO3.
D)K2O.
E)CaO.
8

The most common source for the commercial production of aluminum is
A)cinnabar.
B)galena.
C)bauxite.
D)aluminite.
E)beryl.
9

In the Hall process, corundum is reduced to aluminum by
A)electrolysis.
B)carbon monoxide.
C)molecular hydrogen.
D)carbon (coke) .
E)sodium.
10

Al(OH)3
A)dissolves in acidic solutions.
B)dissolves in basic solutions.
C)is insoluble in acidic solutions.
D)is insoluble in basic solutions.
E)A and B
F)C and D








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