AFOQT Practice Test

Which example is NOT a homogeneous mixture?

1. Air

2. Salt water

3. Vegetable soup

4. Sugar solution

The correct answer is: Vegetable soup

Homogeneous mixtures are defined as mixtures that have a uniform composition throughout, meaning that the different components are not visibly distinguishable and are evenly distributed. Air, for example, is a homogeneous mixture because it consists of various gases that are evenly mixed, making it appear uniform to the naked eye. Salt water is also a homogeneous mixture because the salt dissolves evenly in water, resulting in a consistent composition throughout the solution. Similarly, a sugar solution exhibits uniformity since the sugar dissolves completely in water, again creating a consistent mixture. In contrast, vegetable soup contains visible chunks of vegetables that do not blend uniformly with the broth. The different components—vegetables, broth, and any additional ingredients—remain distinguishable from one another, which makes it a heterogeneous mixture. This clearly distinguishes vegetable soup from the other options, which all exhibit the characteristics of homogeneous mixtures.