What is defined as an explosive chemical?

An explosive chemical is defined by its ability to undergo a rapid chemical reaction that results in the release of energy, pressure, gas, and heat, often leading to an explosive event. This capability is characterized by a sudden and violent release of these elements, typically triggered by shock, heat, or other forms of energy. The rapid release of these factors poses significant hazards in various settings, thereby requiring stringent safety measures during handling and storage.

The other options describe different properties of chemicals but do not encompass the specific criteria that make a chemical explosive. For instance, a chemical that ignites easily may be flammable but not necessarily explosive, as it may not produce a rapid release of pressure or gas. Similarly, a chemical that releases energy when burned does not imply an explosive reaction unless it leads to the sudden reaction described. Lastly, a chemical that fumes when in contact with air is concerning for toxicity or reactivity but does not define explosive behavior, which specifically involves rapid pressure and gas release.