What is an oxidized substance?

• A. A substance or article that explodes as a mass
• B. A organism that is believed to be infectious to humans
• C. A substance that might spontaneously combust when exposed to air
• D. A substance that contributes to the combustion of other materteral by yielding oxygen

Answer: (D)

An oxidizing substance is defined by its role in supporting combustion: it readily provides or supplies oxygen to help other materials burn. In fire safety, oxidizers don’t necessarily burn themselves, but they enable or accelerate the oxidation of fuels by releasing oxygen or making it more available. That’s why describing an oxidizing substance as one that contributes to the combustion of other material by yielding oxygen is the best fit.

The other ideas don’t capture this function. An explosive mass relates to rapid energy release, not to providing oxygen to fuel burning. An infectious organism is unrelated to chemical oxidation. A substance that might spontaneously combust focuses on self-ignition behavior, not on aiding the burning of other materials by supplying oxygen.