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A rock looks like a mixture, but air does not. Heterogeneous Mixtures A heterogeneous mixture is a mixture in which substances are not evenly mixed. For example, granite is a heterogeneous mixture. The substances that make up granite are unevenly mixed. When you look at a piece of granite, you can easily see the different parts.
Mixtures can either be homogeneous or heterogeneous. A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties. A heterogeneous mixture is a type of mixture in which the components can be seen, as there are two or more phases present. One example of a mixture is air. Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures.