Multiple Choice
Which of the following is the correct name for the ionic compound KOH?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct chemical name for the compound CuS?
A
Copper(II) sulfate
B
Copper(II) sulfide
C
Copper(I) sulfide
D
Copper(I) sulfate
Verified step by step guidance1
Identify the elements present in the compound CuS: copper (Cu) and sulfur (S).
Recognize that CuS is a binary compound composed of a metal (copper) and a nonmetal (sulfur), so it is named as a metal followed by the nonmetal with an '-ide' suffix.
Determine the oxidation state of copper in CuS. Since sulfur typically has a charge of -2 in sulfides, copper must have a +2 charge to balance the compound (Cu^{2+} and S^{2-}).
Use the oxidation state of copper to name the compound correctly, which is Copper(II) sulfide, indicating copper with a +2 charge and sulfide as the anion.
Confirm that the compound is not a sulfate (which contains SO_4^{2-}), so names containing 'sulfate' are incorrect for CuS.
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