Brass is an example of a(n):

molecule

heterogeneous mixture

solution

compound

homogeneous mixture or solid solution

Explanation:

A mixture is said to be a substance containing two or more substances that are not chemically combined together. A mixture can be easily separated to it original components.

Mixture are not chemically bonded together .  An homogeneous mixture is a mixture that is uniformly mixed together . example is air.

An heterogeneous mixture is a mixture is such that the components can be  separated from each other.

Brass is an homogeneous mixture  . Most Alloys of metals are  mixture example are Brass, steel and solder. Brass combines two different metal like zinc and copper to form brass. The mixture can be easily separated to their components elements and are not chemically bonded.  

Brass can also be regarded as a solid solution which involve zinc or other metals(solute) dissolve in a solvent(copper). The best option is a solution.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.