Chemistry (Chang), 10th Edition

Chapter 20: 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-Heroult 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
11
Which of the following types of metals is incorrectly matched with the mineral?
A)phosphate; hydroxyapatite
B)oxide; corundum
C)carbonate; dolomite
D)sulfide; anhydrite
12
Which method is generally useful in separating metals at high temperatures?
A)ferromagnetism
B)pyrometallurgy
C)roasting
D)floatation
13
What type of metal is generally separated using a strong electromagnet?
A)ferromagnetic
B)oxide
C)alkaline
D)uncombined
14
The Band Theory deals with the ability of metals to conduct heat and/or electricity as a result of localized electron's ability to move from orbital to orbital.
A)True
B)False
15
Which method is correctly paired with the metal?
A)Mond; sodium carbonate
B)Solvay; aluminum
C)Hall-Heroult; nickel
D)None of the above
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