Physical or Chemical Change?

Sodium chloride is a solid at room temperature. Put a pinch of it in water and it dissolves,

NaCl_(s) → Na⁺_(aq) + Cl^-_(aq).

Silver chloride also is a solid at room temperature. Put a pinch of it in water and nothing happens.

Mix standard solutions of NaNO₃ and KCl and nothing happens.

Mix standard solutions of AgNO₃ and KCl and a white precipitate forms,

Ag⁺_(aq) + Cl^-_(aq→ AgCl_(s).

Precipitating and dissolving are opposites. Given what you learned in Part One, do you think they are better classified as physical changes or chemical changes?