Which scenario demonstrates accurate use of scientific vocabulary?

• A. Displacement cannot occur in aqueous solutions.
• B. A combustion reaction always requires a fuel and oxygen.
• C. All energy transfer occurs only as heat.
• D. Combustion is an example of oxidation but not a reaction.

Answer: (B)

Understanding how scientific vocabulary fits together helps you pick statements that are accurate. Combustion is a chemical reaction where a substance reacts with an oxidizer, usually oxygen in the air, releasing energy as heat and often light. Saying that a combustion reaction always involves a fuel and oxygen uses the terms in a correct, conventional way, which is why this statement is the best choice. The other options misuse terms or oversimplify: displacement can occur in aqueous solutions; energy transfer isn’t limited to heat and can happen as light, sound, or other forms; and combustion is indeed a chemical reaction (an oxidation–reduction process), not something separate from a reaction.