When you combine silver nitrate (AgNO₃) with hydrochloric acid (HCl), a chemical reaction occurs. This reaction produces silver chloride (AgCl), which is an insoluble white precipitate, along with nitric acid (HNO₃) as a byproduct. The overall reaction can be represented by the following equation:
\[ AgNO_3(aq) + HCl(aq) \rightarrow AgCl(s) + HNO_3(aq) \]
Since new substances are formed (silver chloride and nitric acid), and the original substances (silver nitrate and hydrochloric acid) have different chemical properties than the products, this is classified as a chemical change.