Chapter 18: Problem 25
What is an oxidizing agent? What is a reducing agent?
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Chapter 18: Problem 25
What is an oxidizing agent? What is a reducing agent?
These are the key concepts you need to understand to accurately answer the question.
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Explain how some metals, notably aluminum, naturally resist complete oxidation by the atmosphere.
Iron ores, usually oxides of iron, are converted to the pure metal by reaction in a blast furnace with carbon (coke). The carbon is first reacted with air to form carbon monoxide, which in turn reacts with the iron oxides as follows: $$ \mathrm{F}_{2} \mathrm{O}_{3}(s)+3 \mathrm{CO}(g) \rightarrow 2 \mathrm{Fe}(l)+3 \mathrm{CO}_{2}(g) $$ Identify the atoms that are oxidized and reduced, and specify the oxidizing and reducing agents.
Consider the oxidation-reduction reaction $$ \mathrm{Mg}(s)+\mathrm{Cu}^{2+}(a q) \rightarrow \mathrm{Mg}^{2+}(a q)+\mathrm{Cu}(s) $$ Sketch a galvanic cell that uses this reaction. Which metal ion is reduced? Which metal is oxidized? What half-reaction takes place at the anode in the cell? What half-reaction takes place at the cathode?
Why must the number of electrons lost in the oxidation equal the number of electrons gained in the reduction? Is it possible to have "leftover" electrons in a reaction?
Give some examples of how we make good use of oxidation-reduction reactions in everyday life.
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