Final answer:
Carbon dioxide, CO2, is a compound consisting of carbon and oxygen. When dissolved in water, it forms a homogeneous mixture.
Explanation:
Carbon dioxide, CO2, is classified as a compound because it is made up of two different elements, carbon, and oxygen, chemically combined in a fixed ratio. In the context of mixtures, since it is dissolved in water, carbon dioxide dissolved in water is considered a homogeneous mixture.
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