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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 a chemical reaction has changed the copper into brass
B.
because the physical properties of the mixture are similar to its components
C.
because the physical properties of the mixture are different than its components
D.
because the copper is hidden by the zinc in the brass
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