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A penny made only of copper would be classified as

Rationale

A penny made only of copper would be classified as a pure substance that is an element.

If a penny is made entirely of copper, it means that it contains only one type of atom - copper. Thus, it is considered a pure substance. Furthermore, copper is an element on the periodic table, which classifies the penny as a pure substance that is an element.

A (heterogeneous mixture of two compounds) YOUR ANSWER

A heterogeneous mixture of two compounds implies that there are at least two different types of molecules present that do not blend seamlessly on a molecular level. If a penny was made entirely of copper, it would not be a mixture of two compounds but a pure substance made up of only one type of atom.

C (homogeneous mixture of two elements) YOUR ANSWER

A homogeneous mixture of two elements would imply that the penny is composed of two different types of atoms evenly distributed throughout. This is not the case if the penny is made entirely of copper, which is a single element.

D (pure substance that is a compound) YOUR ANSWER

A compound is a pure substance composed of two or more different elements combined in a fixed ratio. If a penny is made entirely of copper, it contains only one type of atom - copper - and thus cannot be considered a compound.

Conclusion

If a penny is made entirely of copper, it means it consists of only copper atoms, making it a pure substance. As copper is an element on the periodic table, the penny would be classified as a pure substance that is an element. Other classifications such as a mixture of two compounds, mixture of two elements, or a compound are incorrect as they imply the presence of more than one type of atom, which is not the case in a penny made purely of copper.

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