The Foundations of Chemistry

21-25 The Hydrogen–Oxygen Fuel Cell 891 H 2 (g) + H 2 O(g) 2H 2 (g)  O 2 (g) → 2H 2 O(
) Voltmeter O 2 (g) + H 2 O(g) e OH OH ...

892 CHAPTER 21: Electrochemistry Key Terms Alkaline cell A dry cell in which the electrolyte contains KOH. Ampere Unit of electr ...

Exercises 893 Exercises Redox Review and General Concepts *001.(a) Define oxidation and reduction in terms of electron gain or l ...

894 CHAPTER 21: Electrochemistry Faraday’s Law *016.What are (a) a coulomb, (b) electric current, (c) an ampere, and (d) a farad ...

Exercises 895 trode. (ii) The ferrous ion, Fe^2 , concentration increases in the other electrode solution. *038.Repeat Exercise ...

896 CHAPTER 21: Electrochemistry *054.(a) Will Fe^3 oxidize Sn^2 to Sn^4 in acidic solution? (b) Will dichromate ions oxidize ...

Exercises 897 075.Identify all of the terms in the Nernst equation. What part of the Nernst equation represents the correction f ...

898 CHAPTER 21: Electrochemistry (b) Chromium dissolves in dilute hydrochloric acid to produce a solution that contains Cr^3 , ...

Exercises 899 plating silver onto jewelry. (c) A jeweler purchases highly purified silver to use as the anode in an electroplati ...

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22 Metals I: Metallurgy ...

OUTLINE Metals 22-1 Occurrence of the Metals Metallurgy 22-2 Pretreatment of Ores 22-3 Reduction to the Free Metals 22-4 Refinin ...

OCCURRENCE OF THE METALS In our study of periodicity we learned that metallic character increases toward the left and toward the ...

PRETREATMENT OF ORES After being mined, many ores must be concentrated by removal of most of the gangue. Most sulfides have rela ...

blowing the lighter particles away via a cyclone separator (Figure 22-2a). These particles can be sifted out through layers of v ...

heat 2ZnS(s)3O 2 (g)888n2ZnO(s)2SO 2 (g) Roasting sulfide ores causes air pollution. Enormous quantities of SO 2 escape into t ...

The very active metals, such as Al and Na, are reduced electrochemically, usually from their anhydrous molten salts. If H 2 O is ...

22-4 Refining of Metals 907 TABLE 22-3 Some Specific Reduction Processes Metal Compound (ore) Reduction Process Comments mercury ...

METALLURGIES OF SPECIFIC METALS The metallurgies of Mg, Al, Fe, Cu, and Au will be discussed as specific examples. The order of ...

CaCO heat 3 (s)888nCaO(s)CO 2 (g) lime production CaO(s)H 2 O(
)888nCa(OH) 2 (s) slaking lime Ca(OH) 2 (s)Mg^2 (aq)888nCa^2 ...