What term is used to describe a substance that can explode violently?

The term described as a substance that can explode violently is "explosive." This designation refers specifically to materials that can undergo a rapid chemical reaction, often resulting in a significant release of energy, pressure, and gas. Explosives can be classified into various types based on their sensitivity and the speed at which they detonate.

The other terms listed refer to different hazards: "toxic" indicates that a substance is harmful or lethal if ingested, inhaled, or absorbed, while "chemical" is a broad term that encompasses any substance with a defined composition, not specifically relating to its potential for explosion. "Corrosive" refers to substances that can destroy or damage other materials, particularly living tissue, through chemical reactions, but this does not imply explosive properties.