AFOQT Practice Test

What defines a homogeneous mixture?

1. A mixture that settles into layers

2. A combination where the composition is uniform throughout

3. A mixture that consists of large visible particles

4. A solution that is always solid

The correct answer is: A combination where the composition is uniform throughout

A homogeneous mixture is characterized by a composition that is uniform throughout. This means that the individual components are evenly distributed and are not distinguishable from one another in any given sample. Examples of homogeneous mixtures include solutions like saltwater or air, where the different substances blend seamlessly to create a single-phase system. This definition highlights that in a homogeneous mixture, every part of the mixture has the same composition and properties, making it consistent throughout. Other options describe different types of mixtures. A mixture that settles into layers suggests a heterogeneous mixture, where different components can be identified and separated, while a mixture with large visible particles indicates a suspension or colloid, which is also not uniform throughout. Lastly, stating a solution is always solid misrepresents the nature of solutions, which can be liquid, gas, or solid.