Which of the following best describes a mixture that has the same composition throughout?

• A. Compound
• B. Heterogeneous mixture
• C. Element
• D. Homogeneous mixture

Answer: (D)

Verified step by step guidance

1. Understand the definitions of the terms given: A compound is a substance formed when two or more elements chemically combine in fixed proportions; an element is a pure substance consisting of only one type of atom; a heterogeneous mixture has a non-uniform composition where different parts can be distinguished; a homogeneous mixture has a uniform composition throughout.
2. Recognize that the question asks for a mixture with the same composition throughout, which means the properties and composition are consistent in every part of the sample.
3. Recall that a homogeneous mixture is also called a solution, where the components are evenly distributed at the molecular level, making it uniform throughout.
4. Eliminate options that do not fit the description of a mixture with uniform composition: a compound and an element are pure substances, not mixtures, and a heterogeneous mixture is not uniform.
5. Conclude that the best description for a mixture with the same composition throughout is a homogeneous mixture.