Multiple Choice
Which of the following is the correct chemical formula for iron(III) fluoride?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for copper(I) iodide?
A
Cu2I2
B
CuI
C
Cu2I
D
CuI2
Verified step by step guidance1
Identify the oxidation state of copper in copper(I) iodide. The Roman numeral I indicates that copper has a +1 charge (Cu⁺).
Determine the charge on the iodide ion. Iodide (I⁻) has a charge of -1.
Balance the charges to form a neutral compound. Since Cu⁺ and I⁻ have charges of equal magnitude but opposite sign, they combine in a 1:1 ratio.
Write the chemical formula by combining one Cu⁺ ion with one I⁻ ion, resulting in CuI.
Verify that the formula CuI is electrically neutral and correctly represents copper(I) iodide.
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