Homogeneous mixture

• A. A mixture that settles out
• B. A pure substance
• C. A mixture with visible layers
• D. A mixture in which the composition is uniform throughout

Answer: (D)

A homogeneous mixture has a uniform composition throughout. The components are distributed so that every sample has the same proportions, so you can’t see different substances by eye or touch—the mixture looks the same wherever you sample it. This contrasts with mixtures that settle out or have visible layers, which show uneven distribution and indicate a heterogeneous system. A pure substance isn’t a mixture at all; it’s a single material with a fixed composition. So the idea of consistent, even distribution across the whole sample is what defines a homogeneous mixture.