Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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How is the compound Cu2O traditionally named?

  1. Cupric oxide

  2. Oxide of copper

  3. Cuprous oxide

  4. Carbon oxide

The correct answer is: Cuprous oxide

The compound Cu2O is traditionally named cuprous oxide. This name arises from the Latin word "cuprum," which refers to copper. In chemical nomenclature, the prefix "cuprous" indicates that copper is in the +1 oxidation state, which is characteristic of this specific compound. Cu2O consists of two copper atoms combined with one oxide ion (O2-), and since each copper atom contributes one positive charge, the overall charge of the compound is neutral. This naming convention is important for distinguishing this compound from CuO, known as cupric oxide, where the copper is in the +2 oxidation state. Thus, the name cuprous oxide reflects both the composition of the compound and the oxidation state of copper within it, which is crucial in the study of inorganic chemistry and helps in understanding the properties and reactions of copper oxides.

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