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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.
Compounds are classified as pure compounds. Compounds are classified as pure compounds. To understand this it is helpful to know how matter is classified from general to specific categories. One approach to classification separates matter into mixtures and pure substances. Mixtures are composed of substances that are physically combined. For example dirt is a heterogenous mixture because it is composed of particles of differing sizes while solutions are homogenous mixtures composed of solute and solvent.