A mixture that is uniform throughout. All of the components in this mixture are proportional or even.

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Homogeneous Mixture

A mixture that has visible particles in it. All components are mixed together but easily identifiable.

Heterogeneous Mixture

In this example, a homogeneous cup of coffee has all 3 ingredients blended together. A heterogeneous cup of coffee has visible clumps of the 3 ingredients.

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What's the difference?