Page 1037 - Chemistry--atom first

Chapter 18 | Representative Metals, Metalloids, and Nonmetals 1027
Figure 18.57 Perchlorate ions, can be produced when perchloric acid reacts with a base or by electrolysis of hot solutions of their chlorides.
Perbromate salts are difficult to prepare, and the best syntheses currently involve the oxidation of bromates in basic solution with fluorine gas followed by acidification. There are few, if any, commercial uses of this acid or its salts.
There are several different acids containing iodine in the 7+-oxidation state; they include metaperiodic acid, HIO4, and paraperiodic acid, H5IO6. These acids are strong oxidizing agents and react with bases to form the appropriate salts.
18.10 Occurrence, Preparation, and Properties of Sulfur
By the end of this section, you will be able to:
• Describe the properties, preparation, and uses of sulfur
Sulfur exists in nature as elemental deposits as well as sulfides of iron, zinc, lead, and copper, and sulfates of sodium, calcium, barium, and magnesium. Hydrogen sulfide is often a component of natural gas and occurs in many volcanic gases, like those shown in Figure 18.58. Sulfur is a constituent of many proteins and is essential for life.
Figure 18.58 Volcanic gases contain hydrogen sulfide. (credit: Daniel Julie/Wikimedia Commons)
The Frasch process, illustrated in Figure 18.59, is important in the mining of free sulfur from enormous