Describe why flammability is a chemical property rather than a physical property.

Flammability is considered a chemical property because it describes a substance's ability to undergo a chemical change. When a material is flammable, it means that it can react with oxygen in the air to produce combustion, resulting in new substances such as carbon dioxide, water, and other compounds. This process involves breaking and forming chemical bonds, which is characteristic of a chemical change. In contrast, physical properties are those that can be observed or measured without changing the substance's chemical identity, such as color, melting point, or density. Therefore, flammability is classified as a chemical property because it pertains to a substance's potential to engage in a chemical reaction.