What occurs when a molecule combines with oxygen and produces heat?A.It evaporates.B.It combusts.C.It precipitates.D.It dissolves.SUBMITarrow_backPREVIOUS

Analyzing the Options

1. Understanding Combustion: Combustion is a chemical reaction that occurs when a substance reacts with oxygen, typically releasing heat and light. This process usually involves hydrocarbons or other organic compounds combining with oxygen.

2. Understanding the Other Options:

   • A. Evaporates: This process involves changing from a liquid to a gas, typically due to temperature change, and does not necessarily involve oxygen.
   • C. Precipitates: This term is related to the formation of a solid from a solution during a chemical reaction.
   • D. Dissolves: This refers to a solute mixing uniformly with a solvent, rather than a reaction with oxygen.

Conclusion

Given the specified processes and the context of combining with oxygen to produce heat, the most appropriate answer is B. It combusts. This is because combustion specifically describes the reaction of a substance with oxygen that produces heat and often light, which aligns exactly with the question asked.

Final Answer

B. It combusts.