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What makes a pure substance different from a heterogeneous mixture? A) The components of a pure substance are mixed unevenly instead of evenly within the pure substance. B)Insoluble instead of soluble particles are suspended within the pure substance. C)Two liquids that normally are not mixable are mixed in a heterogeneous mixture. D)The components of a pure substance are single elements or compounds instead of a mixture of compounds.

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Yna9141
Pure substance is a group made up chemical or chemical substances which has constant composition. In other words, pure substance is homogeneous. At all points of the mixture, the composition is not changed. This is in contrast with the heterogeneous mixture where the composition is varying. 

With the reasoning given above, the answer to this item is letter D. 
Jmskristin

Answer:

The components of a pure substance are single elements or compounds instead of a mixture of compounds. (D)

Explanation:

got his right on my FLVS test. hope this helps.