How are homogeneous and heterogeneous mixtures different?

Homogeneous and heterogeneous mixtures differ significantly in terms of their composition and appearance. Homogeneous mixtures are characterized by having a uniform composition throughout, meaning that the different components are evenly distributed and cannot be distinguished from one another. A common example of a homogeneous mixture is saltwater, where the salt is completely dissolved in the water and is indistinguishable from it.

In contrast, heterogeneous mixtures do not have a uniform composition. This means that the individual components can often be seen and separated, as they are not uniformly mixed. An example of a heterogeneous mixture is a salad, where the different ingredients—lettuce, tomatoes, and cucumbers—maintain their individual properties and can be easily identified.

Thus, the correct answer highlights that homogeneous mixtures have a uniform composition, while heterogeneous mixtures do not, which is essential for understanding the nature of mixtures in chemistry.