Multiple Choice
What is the correct name for the compound with the formula MgI_2?
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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(II) bromide?
A
Cu2Br
B
CuBr
C
CuBr2
D
Cu2Br2
Verified step by step guidance1
Identify the oxidation state of copper in copper(II) bromide. The Roman numeral II indicates that copper has a +2 charge, so Cu is Cu^{2+}.
Determine the charge of the bromide ion. Bromide (Br) is a halide ion with a charge of -1, so Br is Br^{-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral.
Since copper has a +2 charge and bromide has a -1 charge, you need two bromide ions to balance one copper ion: Cu^{2+} and 2 Br^{-}.
Write the formula by placing the number of ions as subscripts: CuBr_{2}.
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