1. . Some metals are found in the uncombined free state while others are found in the combined state. What is a deciding factor?
e) None of the above
(A) Metals with negative reduction potentials can occur in the free state while metals with positive reduction potentials occur in the combined state.
(B) The active metals can occur in the free state while the less active metals occur in the combined state.
(C) Metals with positive reduction potentials can occur in the free state while metals with negative reduction potentials can occur in the combined state.
(D) There is no way we can predict which metals will be free or combined.
2. . Soluble metal compounds tend to be found in the _____, whereas insoluble metal compounds tend to be found in the _____.
e) Rivers; oceans
(A) Oceans; earth's crust
(B) Earth's crust; oceans
(C) Salt beds; oceans
(D) Oceans; salt beds
3. . In the process known as 'roasting,' a (n) _____ is chemically converted to a (n) _____.
e) Phosphate; phosphide
(A) Sulfide; oxide
(B) Carbonate; oxide
(C) Hydroxide; oxide
(D) Oxide; sulfate
4. . Which metal can be found as the free element?
e) Pt
(A) Na
(B) Mn
(C) Fe
(D) Cr
5. . The Hall-Heroult process is used in the production of:
e) Cu
(A) Mg
(B) Fe
(C) Al
(D) Au
6. . How much magnesium can be obtained from one pound of seawater if the concentration of Mg²⁺ is 0.13 weight percent? Assume 100% recovery.
e) 2.5 grams
(A) 1.7 grams
(B) 1.3 grams
(C) 0.35 grams
(D) 0.59 grams
7. . For every 100 pounds of iron ore there are 27.8 pounds of magnetite (Fe₃O₄). What is the weight percent iron in this ore?
e) 23.1%
(A) 72.3%
(B) 20.1%
(C) 27.8%
(D) 16.7%
8. . A reaction sequence for the reduction of iron ore is given. Calculate the amount of coke necessary to produce 800 g of Fe.
e) 544 g
(A) 114 g
(B) 1030 g
(C) 258 g
(D) 172 g
9. . What is the charge on the copper ion in the mineral azurite, Cu₃(CO₃)₂(OH)₂?
e) 2−
(A) 2+
(B) 1+
(C) 0
(D) 1−
10. . How many coulombs of electricity are required to produce one metric ton (1000 kg) of magnesium?
e) 5.3 × 10⁸ coulombs
(A) 4.0 × 10⁹ coulombs
(B) 2.0 × 10⁹ coulombs
(C) 7.9 × 10⁹ coulombs
(D) 1.2 × 10¹² coulombs