Question

part a
what is the difference between a homogeneous - mixture and a heterogeneous mixture?
a heterogeneous mixture has two or more distinct regions that have different compositions. a homogeneous mixture has only one region and the composition of the mixture does not change
a homogeneous mixture has two or more distinct regions that have different compositions. a heterogeneous mixture has only one region and the composition of the mixture does not change
a heterogeneous mixture has two or more distinct regions that have different compositions. a homogeneous mixture has only one region and the composition of the mixture may change
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Explanation:

A heterogeneous mixture has two or more distinct regions with different compositions. A homogeneous mixture has a uniform composition throughout, i.e., only one region and its composition does not change.

Answer:

A. A heterogeneous mixture has two or more distinct regions that have different compositions. A homogeneous mixture has only one region and the composition of the mixture does not change.