Chapter 18: Problem 8
Why must the sum of all the oxidation states of the atoms in a neutral molecule be zero?
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Chapter 18: Problem 8
Why must the sum of all the oxidation states of the atoms in a neutral molecule be zero?
These are the key concepts you need to understand to accurately answer the question.
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In each of the following reactions, identify which species is the oxidizing agent. a. \(2 \mathrm{Al}(s)+6 \mathrm{HCl}(a q) \rightarrow 2 \mathrm{AlCl}_{3}(a q)+3 \mathrm{H}_{2}(g)\) b. \(\mathrm{Cu}(s)+\mathrm{H}_{2} \mathrm{SO}_{4}(a q) \rightarrow \mathrm{CuSO}_{4}(a q)+\mathrm{H}_{2}(g)\)
What is a half-reaction? What does each of the two half-reactions that make up an overall process represent?
Potassium iodide in solution reacts readily with many reagents. In the following reactions, identify the atoms that are being oxidized and reduced, and specify the oxidizing and reducing agents. a. \(\mathrm{Cl}_{2}(g)+\mathrm{KI}(a q) \rightarrow \mathrm{KCl}(a q)+\mathrm{I}_{2}(s)\) b. \(2 \mathrm{FeCl}_{3}(a q)+2 \mathrm{KI}(a q) \rightarrow 2 \mathrm{FeCl}_{2}(a q)+2 \mathrm{KCl}(a q)+\mathrm{I}_{2}(s)\) c. \(2 \mathrm{CuCl}_{2}(a q)+4 \mathrm{KI}(a q) \rightarrow 2 \mathrm{CuI}(s)+4 \mathrm{KCl}(a q)+\mathrm{I}_{2}(s)\)
In which direction do electrons flow in a galvanic cell, from anode to cathode or vice versa?
In each of the following reactions, identify which element is being oxidized and which is being reduced by assigning oxidation numbers. a. \(2 \mathrm{Al}(s)+3 \mathrm{~S}(s) \rightarrow \mathrm{Al}_{2} \mathrm{~S}_{3}(s)\) b. \(\mathrm{CH}_{4}(g)+2 \mathrm{O}_{2}(g) \rightarrow \mathrm{CO}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(g)\) c. \(2 \mathrm{Fe}_{2} \mathrm{O}_{3}(s)+3 \mathrm{C}(s) \rightarrow 3 \mathrm{CO}_{2}(g)+4 \mathrm{Fe}(s)\) d. \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}(a q)+14 \mathrm{HCl}(a q) \rightarrow 2 \mathrm{KCl}(a q)+2 \mathrm{CrCl}_{3}(s)+7 \mathrm{H}_{2} \mathrm{O}(l)+3 \mathrm{Cl}_{2}(g)\)
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