An example of a homogeneous substance would be pure silicon, which contains only silicon atoms. Other examples are pure water, which contains only the compound H2O, or pure table salt, which contains only the compound NaCl.
Definition of Homogeneous Mixture: A mixture which has uniform composition and properties throughout. For example, air is a homogeneous mixture of gases. A teaspoonful of table salt stirred into a glass of water also makes a homogeneous mixture. BUT, although a teaspoonful of sand in water will form a mixture, it won't be a homogeneous mixture. (It will be heterogeneous.)
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