Chapter 10: Problem 108
When you turn on an electrical appliance, are you consuming electrons?
Chapter 10: Problem 108
When you turn on an electrical appliance, are you consuming electrons?
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Get started for freeIdentify the oxidizing and reducing agents in the reaction \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \rightarrow \mathrm{N}_{2}+\mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{H}_{2} \mathrm{O}\)
Which of the following are electron-transfer reactions? For those that are, indicate which reactant is the reducing agent and which reactant is the oxidizing agent. (a) \(\mathrm{SeO}_{3}^{2-}+4 \mathrm{I}^{-}+6 \mathrm{H}^{+} \rightarrow \mathrm{Se}+2 \mathrm{I}_{2}+3 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{HI}+\mathrm{KOH} \rightarrow \mathrm{KI}+\mathrm{H}_{2} \mathrm{O}\) (c) \(4 \mathrm{HCl}+\mathrm{O}_{2} \rightarrow 2 \mathrm{Cl}_{2}+2 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{SiO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{4} \mathrm{SiO}_{4}\)
Suppose an atom has an oxidation state of \(+3\). (a) Would more or fewer electrons be assigned to this atom by oxidation-state bookkeeping than are present on a free atom of that element? (b) How many more or fewer?
A street vendor sells you a ring he claims is pure gold. However, when you place the ring in a solution of \(\mathrm{Cu}^{2+}\) ions, copper plates out on the ring. How do you know the ring is a fake? Could it be made of silver?
Indicate whether each reaction is a redox reaction. If it is, which atom gets oxidized and which atom gets reduced? Consult the shortcut rules. \(2 \mathrm{NaBr}+\mathrm{MgO} \rightarrow \mathrm{MgBr}_{2}+\mathrm{Na}_{2} \mathrm{O}\)
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