Which term describes a mixture that is not uniform throughout?

• A. Homogeneous
• B. Heterogeneous
• C. Solubility
• D. Molecule

Answer: (B)

A heterogeneous mixture is not uniform throughout. In these mixtures, the different parts have distinct compositions that can vary from one region to another, so you can often see or separate the different components. Think of a salad, mixed nuts, or granite—each sample may look different because the ingredients aren’t evenly spread. This contrasts with a homogeneous mixture, where the composition is the same everywhere, like salt dissolved in water or air. Solubility describes how well a substance dissolves in a solvent, not how uniform a mixture is. A molecule is a single unit of matter, not a description of how mixtures are arranged.