Chapter 21 – Metallurgy and the Chemistry of Metals
Chapter 21
Metallurgy and the Chemistry of Metals
1. A naturally occurring substance with a range of chemical composition is
2. Which one of these metals would normally be obtained by electrolytic reduction?
Chapter 21 – Metallurgy and the Chemistry of Metals
3. Which one of these metals would normally be obtained by chemical reduction?
4. The naturally occurring form of a metal that is concentrated enough to allow economical
recovery of the metal is known as
5. The flotation process used in metallurgy involves
Chapter 21 – Metallurgy and the Chemistry of Metals
6. Metallic sodium is obtained commercially from molten sodium chloride by
7. Alloys of iron that contain 1.0–1.5% carbon and some manganese, phosphorus, silicon, and
sulfur are called
Chapter 21 – Metallurgy and the Chemistry of Metals
8. Which of these reactions represents the removal of silica from iron ore in a blast furnace?
9. The principal reducing agent in a blast furnace is
Chapter 21 – Metallurgy and the Chemistry of Metals
10. In the Hall process, ____________ is reduced ____________.
11. Volatile impurities are removed from ores by means of
Chapter 21 – Metallurgy and the Chemistry of Metals
12. In the Mond process, nickel is purified by
13. According to the band theory, a band is
Chapter 21 – Metallurgy and the Chemistry of Metals
14. According to the band theory, which of these statements provide(s) an explanation for the
high electrical conductivity of metals?
I. a partly filled conduction band
II. a valence band overlapping an empty conduction band
III. a filled valence band
IV. a large gap between the valence band and the conduction band
15. What effect does increasing temperature have on the conductivities of semiconductors?
Chapter 21 – Metallurgy and the Chemistry of Metals
16. Which one of these elements would give a p-type semiconductor when added to a silicon
crystal?
17. Which of these elements when doped into silicon would give an n-type semiconductor?
18. In p-type semiconductors,
Chapter 21 – Metallurgy and the Chemistry of Metals
19. In n-type semiconductors
20.
Which of the following diagrams represents a semiconductor?
Chapter 21 – Metallurgy and the Chemistry of Metals
21.
Which of the following diagrams represents an insulator?
22. Which group of elements includes the most reactive of all the metallic elements?
Chapter 21 – Metallurgy and the Chemistry of Metals
23. In the production of potassium metal, the source of electrons in the reduction of K+ ions
24. Which two compounds are produced by the Solvay process?
25. What are the two raw materials used in the Solvay process?
Chapter 21 – Metallurgy and the Chemistry of Metals
26. Basic properties are characteristic of all alkaline earth metal oxides except one. The
formula of this exception is
27. Which of these ions is most likely to substitute for Ca2+ in the human body?
Chapter 21 – Metallurgy and the Chemistry of Metals
28. Argentite, chalcocite and cinnabar are all examples of what type of mineral?
29. Barite, anglesite, and epsomite are all examples of what type of mineral?
30. Calcium metal is produced by electrolysis of
Chapter 21 – Metallurgy and the Chemistry of Metals
31. Which one of these elements has seawater as its commercial source?
32. The alkali metals listed in order of increasing melting point is consistent with which of the
following?