Multiple Choice
Which of the following is the correct chemical formula for aluminum oxide?
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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
CuBr2
B
Cu2Br
C
CuBr
D
Cu2Br2
Verified step by step guidance1
Identify the charge on the copper ion in copper(II) bromide. The (II) indicates that copper has a +2 charge, so the ion is Cu^{2+}.
Determine the charge on the bromide ion. Bromide is a halide ion with a charge of -1, so the ion 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, resulting in the formula CuBr_{2}.
Verify that the formula CuBr_{2} has a net charge of zero by multiplying the charge of each ion by the number of ions and summing them: (1 × +2) + (2 × -1) = 0.
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