AFOQT Practice Test

Which of the following best describes a heterogeneous mixture?

1. A mixture with uniform composition

2. A mixture that is not the same throughout

3. A mixture that only includes liquids

4. A mixture that is chemically bonded

The correct answer is: A mixture that is not the same throughout

A heterogeneous mixture is characterized by its lack of uniformity in composition throughout. This means that in a heterogeneous mixture, the different components can be distinctly observed and are not evenly distributed. For example, when you mix oil and water, the two liquids do not blend uniformly and instead form separate layers, clearly showing their individual properties. The other options describe different concepts: a mixture with uniform composition refers to a homogeneous mixture, which maintains consistent properties throughout. A mixture that only includes liquids does not capture the full definition, as heterogeneous mixtures can include solids, gases, and other states of matter. Lastly, a mixture that is chemically bonded refers to a compound, in which elements are joined by chemical bonds, rather than simply mixed physically. Thus, the essence of a heterogeneous mixture is its non-uniformity and the presence of distinguishable components, which is accurately captured in the correct answer.