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

If you want to create an electrical current, which situation would produce a solution capable of this

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?