91Ó°ÊÓ

Use the oxidation-number method to balance the following net ionic redox equations. \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})+\mathrm{I}^{-}(\mathrm{aq}) \rightarrow \mathrm{Cr}^{3+}(\mathrm{aq})+\mathrm{I}_{2}(\mathrm{s})\) (in acid solution)

Use the oxidation-number method to balance the following net ionic redox equations. \(\mathrm{Zn}+\mathrm{NO}_{3}^{-} \rightarrow \mathrm{Zn}^{2+}+\mathrm{NO}_{2}(\text { in acid solution })\)

Use the oxidation-number method to balance the following net ionic redox equations. Challenge \(1^{-}(a q)+M n O_{4}^{-}(a q) \rightarrow I_{2}(s)+M n O_{2}(s)(\text { in basic solution) }\)

Use the half-reaction method to balance the redox equations. Begin by writing the oxidation and reduction half-reactions. Leave the balanced equation in ionic form. \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{-}(\mathrm{aq})+\mathrm{I}^{-}(\mathrm{aq}) \rightarrow \mathrm{Cr}^{3+}(\mathrm{aq})+\mathrm{I}_{2}(\mathrm{s})\) (in acid solution)

Use the half-reaction method to balance the redox equations. Begin by writing the oxidation and reduction half-reactions. Leave the balanced equation in ionic form. \(\mathrm{Mn}^{2+}(\mathrm{aq})+\mathrm{BiO}_{3}^{-}(\mathrm{aq}) \rightarrow \mathrm{MnO}_{4}^{-}(\mathrm{aq})+\mathrm{Bi}^{2+}(\mathrm{aq})\) (in acid solution)

Use the half-reaction method to balance the redox equations. Begin by writing the oxidation and reduction half-reactions. Leave the balanced equation in ionic form. Challenge \(\mathrm{N}_{2} \mathrm{O}(\mathrm{g})+\mathrm{ClO}^{-}(\mathrm{aq}) \rightarrow \mathrm{NO}_{2}^{-}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})\) (in basic solution)

Explain how changes in oxidation number are related to the electrons transferred in a redox reaction. How are the changes related to the processes of oxidation and reduction?

Describe why it is important to know the conditions under which an aqueous oxidation-reducation reaction takes place in order to balance the ionic equation for the reaction.

Explain the steps of the oxidation-number method of balancing equations.

State what an oxidation half-reaction shows. What does a reduction half- reaction show?