Chemical properties refer to the characteristics of a substance that are observed during a chemical reaction or chemical change. These properties include things like reactivity, flammability, acidity, and toxicity. Understanding the chemical properties of a substance is important in various fields such as chemistry, biology, environmental science, and materials science. Researchers in this area study how different substances interact with each other, how they change under different conditions, and how they can be utilized in various applications. By understanding chemical properties, scientists can develop new materials, medicines, and technologies that benefit society.