Multiple Choice
What is the correct name for the ionic compound with the formula CuS?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the ionic compound with the formula (NH_4)_2CrO_4?
A
Ammonium dichromate
B
Chromium(II) ammonate
C
Ammonium carbonate
D
Ammonium chromate
Verified step by step guidance1
Identify the cation and anion in the compound (NH_4)_2CrO_4. The cation is ammonium, NH_4^+, and the anion is chromate, CrO_4^{2-}.
Recognize that the formula shows two ammonium ions balancing one chromate ion, which means the compound is composed of ammonium and chromate ions in a 2:1 ratio.
Recall the naming conventions for ionic compounds: the cation name is stated first (ammonium), followed by the anion name (chromate).
Note that the compound does not contain dichromate (Cr_2O_7^{2-}) or carbonate (CO_3^{2-}), so names like ammonium dichromate or ammonium carbonate are incorrect.
Combine the names of the ions to give the correct name: ammonium chromate.
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