Question

pure copper metal has a very high conductivity. brass, an alloy of copper and zinc, has a much lower conductivity. why are the conductivities different? a. because the physical properties of the mixture are different than its components b. because the physical properties of the mixture are similar to its components c. because a chemical reaction has changed the copper into brass d. because the copper is hidden by the zinc in the brass

Explanation:

Alloys have different physical properties from their component metals. Brass, an alloy of copper and zinc, has a lower conductivity than pure copper because the physical properties of a mixture (alloy) are different from its components. There is no chemical reaction changing copper into brass in the alloy - it is a physical combination. And it's not about copper being hidden.

Answer:

A. because the physical properties of the mixture are different than its components