Which statement best describes a homogeneous mixture?

Which statement best describes a homogeneous mixture?

• A. Contains visibly different parts
• B. Always a pure substance
• C. Has uniform composition throughout
• D. Can be easily separated by filtration

Answer: (C)

A homogeneous mixture is one with uniform composition throughout, so every portion has the same relative amounts of its components and you can’t see any separate parts. That’s why the statement describing uniform composition throughout best captures what makes a mixture homogeneous—the distribution of components is even on all scales. Think about it with examples: salt dissolved in water or air. In both cases, you can’t pick out different substances by sight or feel because they’re spread uniformly at the molecular level. This contrasts with a heterogeneous mixture, where you can observe distinct parts or phases, like oil and water or a sand-and-water mixture. A pure substance, on the other hand, is a single chemical species with a definite composition; many homogeneous mixtures are not pure substances because they contain more than one component. As for filtration, it tends to separate mixtures that have distinct phases or particulates; in a truly homogeneous mixture there aren’t separate parts to trap by a filter, so filtration doesn’t reliably separate its components.

A homogeneous mixture is one with uniform composition throughout, so every portion has the same relative amounts of its components and you can’t see any separate parts. That’s why the statement describing uniform composition throughout best captures what makes a mixture homogeneous—the distribution of components is even on all scales.

Think about it with examples: salt dissolved in water or air. In both cases, you can’t pick out different substances by sight or feel because they’re spread uniformly at the molecular level. This contrasts with a heterogeneous mixture, where you can observe distinct parts or phases, like oil and water or a sand-and-water mixture.

A pure substance, on the other hand, is a single chemical species with a definite composition; many homogeneous mixtures are not pure substances because they contain more than one component. As for filtration, it tends to separate mixtures that have distinct phases or particulates; in a truly homogeneous mixture there aren’t separate parts to trap by a filter, so filtration doesn’t reliably separate its components.