Question

Why is brass regarded as a mixture?

Answer 1

Because it's composed of 2 or more pure substances that are physical, not chemically, bound to each other.The ratios of these can vary greatly; however, they are a solid mixture and are homogeneous. This is why the physical properties of brass are consistent, if it were a heterogeneous mixture then you could see a very large difference in color and other physical properties that would be indicative of one predominant element.
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Answer 2

Because it's composed of 2 or more pure substances that are physically, not chemically, bound to eachother