What is the distinction between homogeneous and heterogeneous mixtures?

The distinction between homogeneous and heterogeneous mixtures is fundamentally about the uniformity of their composition. Homogeneous mixtures are characterized by having a uniform composition throughout. This means that the individual components are evenly distributed and cannot be easily distinguished from one another. An example of a homogeneous mixture would be a well-mixed solution of salt in water, where the salt is completely dissolved and the mixture appears consistent throughout.

In contrast, heterogeneous mixtures display a non-uniform composition. This means that the different components can be seen and often can be separated physically. An example of a heterogeneous mixture is a salad, where various ingredients such as lettuce, tomatoes, and cucumbers can be easily identified and separated.

Therefore, the assertion that homogeneous mixtures have a uniform composition is correct and distinguishes them from heterogeneous mixtures, which do not share this characteristic.