What term describes a substance with uniform composition throughout?

• A. Homogeneous
• B. Corrosive
• C. Combustible
• D. Reactive substance

Answer: (A)

A substance with uniform composition throughout is described as homogeneous. Homogeneous means the material’s composition and properties are the same in every part, so you can’t see or separate different parts by eye. For example, a salt solution or air has the same makeup throughout. If you could clearly see different components or have to physically separate them into parts, it would be a heterogeneous mixture. The other terms describe how a substance behaves chemically or its hazards (how it reacts, whether it corrodes, or whether it combusts), not how evenly its parts are distributed, so they don’t describe uniform composition.