Amixture is made of different materials that can easily be separated.

A heterogeneous mixture is made of different materials that can easily be separated.

Explanation:

Heterogeneous mixture is characterized by a non uniform composition, it contains physically distinct component for examples sand and sugar, oil and water or potassium permanganate crystals and copper sulphate crystals. In this mixtures you can see the distinct components, for example you can separate easily particles of sand and sugar.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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