Multiple Choice
Which of the following is an ionic compound?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct name for the compound CoO?
A
Cobalt(II) oxide
B
Cobalt dioxide
C
Cobalt(I) oxide
D
Cobalt(III) oxide
Verified step by step guidance1
Identify the elements in the compound CoO: cobalt (Co) and oxygen (O).
Determine the charge of the oxygen ion in the compound. Oxygen typically forms an oxide ion with a charge of 2-, written as O^{2-}.
Since the compound is neutral overall, the charge on cobalt must balance the charge on oxygen. Therefore, cobalt must have a charge of 2+ to balance the 2- charge from oxygen.
Use the Stock system to name the compound, which includes the metal name followed by its oxidation state in Roman numerals in parentheses. Here, cobalt has a 2+ charge, so it is named Cobalt(II).
Combine the metal name with the nonmetal root and the suffix '-ide' for oxygen, resulting in the name Cobalt(II) oxide.
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