Is Au pure substance a homogeneous mixture or a heterogeneous mixture?

Answer 1

Au is the atomic symbol for gold, and it is a pure substance. However the gold we meet in everyday life is unlikely to be pure, as other metals are often added to increase its hardness.

Answer 2

Homogeneous mixtures are the all the same (homo = same). Heterogeneous mixtures have different parts (hetero = different). Think of it as you could separate heterogeneous mixtures with tweezers, like a Pizza, while silly putty is all together and you cant separate it like that.

Therefore, because Au is the atomic symbol for gold, an element, it must be homogeneous.

Hope this helps!