Classify the following substance as: a pure substance, a homogeneous mixture, or a heterogeneous mixture.

brass, alloy of Cu and Zn

Question

Classify the following substance as: a pure substance,  a homogeneous mixture, or a heterogeneous mixture.

brass, alloy of Cu and Zn

BlackTom AI · Accepted Answer

The question asks us to classify brass in terms of substance types. 
Option 1: heterogenous mixture. A heterogeneous mixture has visibly different components or phases in its composition, like oil and water or chocolate chip cookies with distinct bits. Brass, however, does not show distinct regions of composition; the copper and zinc are distributed uniformly throughout.
Option 2: homogeneous mixture. Brass is an alloy, specifically a uniform combination of copper (Cu) and zinc (Zn). In brass, the elements are evenly dispersed at the microscopic level, giving a single phase with consistent properties throughout, which fits the definition of a homogeneous mixture.
Option 3: pure substance. A pure substance has a single chemical composition and a single phase, such as pure copper or pure zinc. Brass contains two elements, so it cannot be a pure substance.
In summary, the distinguishing feature is uniform distribution of components in brass (an alloy), which aligns with the characteristics of a homogeneous mixture rather than a heterogeneous mixture or a pure substance.

Classify the following substance as: a pure substance, a homogeneous mixture, or a heterogeneous mixture. brass, alloy of Cu and Zn单项选择题

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