Multiple Choice
When is a Roman numeral used in the name of an ionic compound?
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3. Chemical Reactions
Naming Ionic Compounds
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Which is the correct name for the compound FeS?
A
Iron(II) sulfide
B
Iron sulfate
C
Ferrous sulfate
D
Iron(III) sulfide
Verified step by step guidance1
Identify the elements in the compound FeS: Fe is iron and S is sulfur.
Determine the charge of the sulfur ion. Sulfur typically forms sulfide ions with a charge of 2-, written as S^{2-}.
Since the compound is neutral overall, the iron ion must balance the 2- charge from sulfur. Therefore, iron must have a charge of 2+, written as Fe^{2+}.
Name the iron ion using the Stock system, which indicates the oxidation state in Roman numerals. For Fe^{2+}, the name is Iron(II).
Combine the names of the cation and anion: Iron(II) + sulfide = Iron(II) sulfide.
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