Question

during a lab experiment, john accidentally overheated a penny, causing it to break in half as shown in the picture. from this, he learned that a penny is a / an
element (pure copper)
compound
heterogenous mixture
homogeneous mixture

Explanation:

A penny is made of a mixture of metals (like copper and zinc) that are uniformly distributed, so it's a homogeneous mixture. An element is a pure substance with one type of atom, a compound has two or more elements chemically bonded, and a heterogeneous mixture has non - uniform composition.

Answer:

homogeneous mixture