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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.
Pure and impure chemical substances. A pure element or compound contains only one substance, with no other substances mixed in. Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds. 1  1.2  2. 3  3.4  4. 5  5.ure and impure chemical substances. A pure element or compound contains only one substance, with no other substances mixed in. Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds. 1  1. 2  2. 3  3. 4  4. 5  5.