Multiple Choice
Which of the following is the correct chemical formula for titanium(III) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the compound with the formula CoBr_2?
A
Cobalt(II) bromide
B
Cobalt bromate
C
Cobalt dibromide
D
Cobalt(III) bromide
Verified step by step guidance1
Identify the elements in the compound: Co is cobalt, a transition metal, and Br is bromine, a halogen.
Determine the charge on the bromide ion. Bromine typically forms a bromide ion with a charge of -1 (Br⁻).
Since there are two bromide ions (Br₂), the total negative charge is 2 × (-1) = -2.
To balance the charge, cobalt must have a charge of +2. This is indicated by the Roman numeral II in the name.
Combine the metal name with its oxidation state and the nonmetal name with the appropriate suffix. The correct name is Cobalt(II) bromide.
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