Chapter 14: Problem 84
Why is gold a good metal to use in jewelry?
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
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Chapter 14: Problem 84
Why is gold a good metal to use in jewelry?
These are the key concepts you need to understand to accurately answer the question.
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What is an oxidation number?
A voltaic cell is created by using a copper cathode and a magnesium anode. The cathode is immersed in a solution of \(\mathrm{Cu}^{2+}\) ions, and the anode is immersed in a solution of \(\mathrm{Mg}^{24}\) ions. A salt bridge of \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) is also used. What happens to the ions in the salt bridge as the reaction proceeds?
Under certain conditions, solid carbon reacts with oxygen gas to form carbon monoxide gas. (a) Write a balanced equation for this reaction. (b) What happens to the oxidation number of a carbon atom when it changes from a reactant to a product? How many electrons are transferred? Does carbon gain them or lose them? (c) What happens to the oxidation number of an oxygen atom when it changes from a reactant to a product? How many electrons are transferred? Does oxygen gain them or lose them?
For each of the following, write balanced half-reaction equations. Also write overall balanced equations. (a) \(\mathrm{Zn}(s)+\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3}(a q) \longrightarrow \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}(a q)+\mathrm{Fe}(s)\) (b) \(\mathrm{Mn}(s)+\mathrm{HCl}(a q) \longrightarrow \mathrm{MnCl}_{2}(a q)+\mathrm{H}_{2}(g)\)
Iron is often covered with tin, as in a tin can, to protect it from corrosion. If the tin coating is scratched and some iron is exposed, however, the iron corrodes very rapidly. Explain.
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