Synthesis and decomposition reactions are fundamental chemical processes. Decomposition involves breaking down a compound into its constituent ions or simpler substances, while synthesis refers to the combination of elements or simpler compounds to form a more complex compound. For example, aluminum fluoride (AlF3) can decompose into aluminum ions (Al3+) and fluoride ions (F-) when heated. In contrast, potassium chloride (KCl) can be synthesized from potassium (K) and chlorine (Cl2) through a reaction that produces KCl. Understanding these processes is essential for grasping how compounds interact in chemical reactions.