Which equation shows a chemical change?
- A$\text{BaCl}_2(s) \rightarrow \text{BaCl}_2(l)$
- B$\text{Ca}^{2+}(aq) + \text{SO}_4^{2-}(aq) \rightarrow \text{CaSO}_4(s)$
- C$\text{KCl}(s) + \text{H}_2\text{O}(l) \rightarrow \text{K}^+(aq) + \text{Cl}^-(aq)$
- D$\text{Na}^+(aq) + \text{NO}_3^-(aq) \rightarrow \text{NaNO}_3(aq)$