Yes, compounds can be broken down into smaller substances through various chemical processes. One common method is through chemical decomposition, where a compound is broken down into simpler substances through the application of heat, light, or chemical reagents. For example, water (H2O) can be decomposed into hydrogen (H2) and oxygen (O2) through electrolysis, where an electric current is passed through water, causing it to split into its constituent elements. Another method is through chemical reactions, where a compound reacts with another substance to form new products. For instance, when sodium hydroxide (NaOH) reacts with hydrochloric acid (HCl), it forms sodium chloride (NaCl) and water (H2O). In summary, compounds can be broken down into smaller substances through chemical decomposition and chemical reactions.