please help! ch 20
\[ \mathrm{Mg}(\mathrm{s})+\mathrm{Cr}^{3}+(\mathrm{aq}) \rightarrow \mathrm{Mg}^{2+}(\mathrm{aq})+\mathrm{Cr}(\mathrm{s}) \] Express your answer as a chemical equation. Identify all of the phases in