Multiple Choice
Which of the following is the correct chemical formula for calcium permanganate?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the IUPAC name for the compound CoBr2?
A
Cobalt dibromide
B
Cobalt(II) bromide
C
Cobalt(III) bromide
D
Cobalt bromide
Verified step by step guidance1
Identify the metal and the nonmetal in the compound. Here, Co is cobalt (a transition metal), and Br is bromine (a halogen).
Determine the charge on the bromide ion. Bromide (Br) typically has a charge of -1.
Since there are two bromide ions, the total negative charge is 2 × (-1) = -2. To balance this, cobalt must have a +2 charge.
Use Roman numerals in parentheses to indicate the oxidation state of the metal in the compound. Since cobalt has a +2 charge, write it as Cobalt(II).
Combine the metal name with its oxidation state and the name of the nonmetal with the appropriate prefix for the number of atoms. The correct IUPAC name is Cobalt(II) bromide.
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